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Syngeneic graft-versus-host disease (SGVHD) develops following lethal irradiation, reconstitution with syngeneic bone marrow, and treatment with a short course of cyclosporin A (CsA) therapy. The disease is characterized by the development of a T helper cell type 1-like cytokine response [interleukin (IL)-12, interferon-γ (IFN-γ), and tumor necrosis factor α], and macrophage activation is central to development of the syndrome. It has been shown that nitric oxide (NO) participates significantly in the development of allogeneic GVHD. Studies were initiated to determine if NO participates in the pathology associated with SGVHD. Significant increases in inducible NO synthase (iNOS) mRNA and circulating NO were found in the tissues of SGVHD versus control animals. Treatment of SGVHD animals with the iNOS inhibitor aminoguanidine (AG) reversed the pathology associated with this disease. Furthermore, AG treatment reduced the production of IL-12 and IFN-γ mRNA in the colons of CsA-treated mice. These studies demonstrate that NO participates in the pathological processes that are associated with the development of murine SGVHD.

Purpose To evaluate the long-term results of proximal interphalangeal (PIP) joint surface replacement arthroplasty for arthritis using the SR PIP implant (Small Bone Innovations, New York, NY). Methods This is a long-term retrospective analysis of results in 39 of 43 joints first reported in 2008. Subjective results were based upon a mailed questionnaire. Active range of motion was measured by a certified hand therapist, and x-rays were obtained to analyze changes occurring since the first study. Results The average follow-up time was 9.3 years. The average active PIP joint arc of motion in the present cohort of patients went from 64° at the first report (2008) to 56° at this time. Radiographic comparisons revealed no major changes since the first study. Ten of 11 revisions were done for pain due to loosening and were performed at an average of 20 months after the primary procedure. No further revisions were necessary in the interim. Overall, subjective measures of satisfaction and symptomatic and functional improvement remained unchanged. Conclusions Surface replacement arthroplasty using the SR PIP implant continues to be an option for patients with osteoarthritis of the PIP joint. Long-term subjective and objective outcomes are comparable to those reported using other implants. This and other studies suggest that this procedure is not appropriate for most rheumatoid joints. In the interim between studies, we saw a reduction in the average PIP joint arc of motion, although this change did not reach statistical significance. Our original revision incidence of 26% has not changed. Subjective evaluation and radiologic findings did not change between studies. Type of study/level of evidence Therapeutic IV.

This report presents a falsely incompatible B cell crossmatch by flow cytometry in a lung transplant recipient. The patient was a 35-year-old Caucasian male with end-stage lung disease secondary to cystic fibrosis whose pretransplantation serologic workup did not disclose the presence of anti-HLA class II antibodies by single antigen bead testing. Unexpectedly, crossmatch of recipient sera with pronase-treated donor lymphocytes resulted in antibody binding to B cells only. The positive reactivity was reproducible in pronase-treated autologous B cells. Recipient sera did not react with nontreated donor or autologous lymphocytes. Herein, we describe our approach to this unexpected crossmatch result and consider the implications of false-positive crossmatch results on transplantation.

Purpose Minimally Invasive Surgery (MIS) has impacted patient care as well as medical training. New medical education opportunities have emerged with MIS. In this pilot study we explore the role of live, interactive MIS to augment and strengthen specific segments of the undergraduate medical curriculum.

Eosinophils have been shown to increase in tissues during many fibrotic conditions and consequently have been suggested to contribute to the development of fibrosis. This study tested the hypothesis that eosinophils are essential in the development of lung fibrosis in mice in response to bleomycin (BLM). Anti-IL-5 antibody was administered intraperitoneally into mice 2 h prior to endotracheal BLM inoculation and thereafter, every other day. Lung eosinophilia was evaluated by measurement of eosinophil peroxidase activity and confirmed by eosinophil counts in histologic sections. Lung fibrosis was evaluated by hydroxyproline content and confirmed by collagen staining in histological sections. Results demonstrated that BLM induced pronounced lung eosinophilia, which was maximal 7 days after BLM treatment and remained elevated through day 14, in C57Bl/6 SCID mice and CBA/J mice. In contrast, eosinophilia was a minor component in the lungs of wildtype C57Bl/6 mice after BLM treatment, although lung fibrosis developed similarly in all three strains of mice. Treatment with anti-IL-5 completely abrogated eosinophilia but failed to block pulmonary fibrosis induced by BLM in all mouse strains, including C57Bl/6 SCID, wildtype C57Bl/6 mice, and CBA/J mice. Analysis of cytokine mRNA by RNase-protection assay in C57Bl/6 SCID mice indicated that BLM treatment caused enhanced expression of the cytokines, TNF-α, and IL-6 at days 3, 7, and 14 post-BLM inoculation, regardless of whether eosinophils were depleted by anti-IL-5. Finally, the importance of eosinophils in lung fibrosis was examined in IL-5 gene knockout mice (IL-5tm1Kopf). BLM treatment induced significant lung fibrosis in IL-5 knockout mice in the absence of eosinophilia. These findings indicate that eosinophils are not an absolute requirement for BLM-induced pulmonary fibrosis in the mouse.

Effects of larval nutrition on vector competence of the mosquito Aedes vigilax (Skuse) (Diptera: Culicidae) from Townsville, north Queensland, for Ross River virus (RR) were examined. Larvae were reared on three different diets to create three significantly different size classes of adult mosquito. These were fed on serial dilutions of RR and then sampled on alternate days so the progression of the virus through the mosquito could be examined. No differences of vector competence could be attributed to larval nutrition. Barriers to infection and the correlation between infection rate, viral titre and transmission of RR by Ae. vigilax were also examined. The mesenteronal barrier was the only infection barrier expressed. No correlation between viral titre and transmission was detected, but a strong correlation was found between salivary gland infection and transmission rate. From this it was possible to estimate that 98.7+/-1.3% of Ae. vigilax with infected salivary glands transmit RR.

Population genetics of the mosquito Aedes vigilax (Skuse) (Diptera: Culicidae), a major vector of arboviruses (e.g. Barmah Forest, Ross River), were investigated to obtain an indirect estimate of mosquito dispersal characteristics in typical habitats of Aedes vigilax in south-east Queensland: on the off-shore islands of Moreton Bay and on the mainland where disjunct breeding populations of Ae. vigilax are distributed along intertidal marsh. Six allozyme loci were assessed for genetic differentiation between samples from 11 localities. Significant larval variation between some breeding sites was attributed to site-specific selection. Nonsignificant genetic differentiation was found among collections of adult mosquitoes caught in light traps throughout the study area (exceeding 60 x 27 km), indicating widespread dispersal. As distances of ≤ 9 km over water did not appear to act as effective barriers to Ae. vigilax dispersal, localized control activities applied to Ae. vigilax breeding sites are unlikely to be effective against the vagile adult population. Therefore, the contiguous shires programme of broad acre control is endorsed to prevent the spread of arboviruses carried by Ae. vigilax.

Cyclosporin A (CsA) has been used clinically to induce graft-versus-host disease following autologous bone marrow transplantation in an attempt to destroy residual leukemia cells and reduce relapse. To analyze the antitumor potential of murine syngeneic graft-versus-host disease (SGVHD), C3H/HeN mice were lethally irradiated, reconstituted with T cell-depleted syngeneic bone marrow (ATBM) and treated with CsA for 21 days. Graft-versus-leukemia activity was assessed by challenging groups of olive oil-treated control ATBM (OO-ATBM) and CsA-treated (CsA-ATBM) mice 1 week after CsA therapy with graded doses of the syngeneic 38C13 B cell lymphoma. Following CsA treatment, up to 70% of CsA-ATBM developed SGVHD and more than 70% of the animals injected with 500 38C13 cells exhibited long-term survival (MST >80 days). In contrast, none of the OO-ATBM control mice developed SGVHD, and more than 75% of these mice died following injection of 500 38C13 tumor cells (MST = 34 days). Long-term survivors were not resistant to tumor challenge suggesting that tumor-specific immunity did not develop. Finally, class II negative 38C13 cells cultured in IL-4 or IL-10 were not inducible for MHC class II molecules, demonstrating that class II-independent antitumor mechanisms exist in SGVHD mice.

Background: Neonatal alloimmune thrombocytopenia is a rare condition due to passively acquired maternal antibodies directed against paternal platelet antigens inherited by the infant. Only 5 cases have been reported due to antibodies against HPA-lb (PLA2) (Zwb). Case Report: We report a case of neonatal alloimmune thrombocytopenia due to anti-HPA-lb in the second pregnancy of a 26-year-old Caucasian female. The male infant was treated with a 5-day course of intravenous immunoglobulin without complications. We report the HLA phenotype of the infant's mother and summarize the previous case reports due to anti-HPA-lb. Conclusion: Based on this case and a review of the literature, intravenous immunoglobulin as well as random donor exchange transfusion and random donor platelet transfusions are effective in the treatment of neonatal alloimmune thrombocytopenia due to anti-HPA-lb. Obvious associations between HLA alleles and sensitization to HPA-lb have not been elucidated.

Pulmonary complications are a major clinical problem following allogeneic bone marrow transplantation (BMT), contributing to more than 30% of transplant-related mortalities. Idiopathic pneumonia syndrome is responsible for significant mortality among BMT patients. However, the etiology of injury to the lung parenchyma by this disease syndrome is unknown and it has been difficult to evaluate the cellular and molecular mechanisms underlying IPS in the absence of a suitable animal model. To study post-BMT lung disease during graft-versus-host disease (GVHD), we have developed a murine model that utilizes a semi-allogeneic parental --> F1 transplant strategy to induce a mild form of GVHD. Progressive inflammatory lung disease developed in animals with mild GVHD, as indicated by changes in immune cell distribution and cytokine expression in the lungs of transplanted animals. Histologic analysis of lung tissue from GVHD mice at 3 wk post-BMT showed minor immunopathologic changes compared with control mice. In contrast, lungs of GVHD mice at 12 wk displayed histopathologic hallmarks of interstitial pneumonitis, such as prominent perilumenal mononuclear cell infiltration and areas of alveolar congestion. Flow cytometric analysis of lung interstitial cells of GVHD mice revealed an increase in CD8+ T-cells at week 3, which decreased to normal levels by week 12 post-BMT. Simultaneously, the percentage of CD4+ T-cells increased progressively above normal levels and peaked at week 7 post-BMT. Analysis of cytokine mRNA expression in lung tissue indicated that steady state levels of interleukin (IL)-1beta, tumor necrosis factor (TNF)-alpha, interferon-gamma, and IL-12 were significantly elevated in lungs of GVHD mice at 3 wk post-BMT compared with untreated controls. Mice that were transplanted with allogeneic bone marrow alone (BMT controls) also displayed elevated expression of these cytokines, although only IL-6 was significantly higher than in untreated controls. In contrast, at 12 wk after transplantation only TNF-alpha and IL-12 levels remained elevated in GVHD mice, suggesting prolonged macrophage activation. On the basis of these findings, we conclude that allogeneic bone marrow transplantation in this mouse model causes a progressive interstitial pneumonitis, which is characterized by an acute influx of CD8+ T-cells, followed in the chronic phase by a prominent accumulation of CD4+ T-cells, and is associated with persistent production of cytokines known to activate macrophages.

OVER A DECADE HAS passed since “Immunologic Classification of Leukemia and Lymphoma” by Foon and Todd was published in Blood .[1][1] Over this decade, flow cytometry has evolved from a promising new technology to an indispensable tool in the diagnosis of hematologic malignancies. Many new

We have previously reported that xenogeneic lethal acute graft-versus-host disease (GVHD) was induced by transplantation of a mixture of human IL-2 activated natural killer (NK) and T cells into SCID mice conditioned with 4 Gy total-body irradiation (TBI), but not by IL-2-activated pure human T cells or NK cells. TBI and transplantation of the mixture of activated cells were both required to produce the lethal effect. We now report the effect of human IL-2 activated NK, T, or NK+T effector cells on the development of acute and chronic GVHD and GVL in SCID mice bearing human leukemic cells. Ten days after being inoculated i.v. with 2 x 10(7) human U-937 or K-562 leukemic cells, SCID mice, hereafter termed hu-leukemic mice, were radiated with 4 Gy TBI and transplanted i.v. with 5 x 10(7) human IL-2-activated NK, T, or NK+T effector cells. Hu-leukemic control mice received neither TBI nor effector cell transplantation. Acute GVHD-positive control SCID mice were transplanted with 5 x 10(7) H-2-incompatible C57Bl/6 splenocytes following 4 Gy TBI. The mice were observed for signs of GVHD and leukemia for 90 days. Twenty of 20 non-effector cell-transplanted control hu-leukemic mice developed signs related to leukemia and died with leukemic infiltration in the brain, liver, kidney, and lung 50-65 days after inoculation. Flow cytometry (FC) demonstrated 21-89% human leukemic cell infiltration in the bone marrow. Fourteen of 14 hu-leukemic mice transplanted with NK+T effector cells did not develop signs of advanced leukemia but died within 17 days of acute GVHD. FC demonstrated no human leukemic cells in their marrow. Twelve of 15 and 18 of 25 hu-leukemic mice transplanted with either NK or T cells survived 90 days without any evidence of symptomatic leukemia (P < 0.01 compared with non-effector cell-transplanted groups). NK-transplanted hu-leukemic animals experienced mild-to-moderate acute GVHD during the first 10-20 days posttransplantation, but gradually recovered and did not develop chronic GVHD. Hu-leukemic animals transplanted with T effector cells manifested no signs of leukemia or acute GVHD but chronic GVHD skin lesions appeared 80-90 days after transplantation. We conclude that acute GVHD, chronic GVHD, and GVL are associated but separable phenomena.

We studied the expression of p53 gene product in pancreatic adenocarcinomas of the usual ductal type to determine its relationship to cigarette smoking and its usefulness as an independent prognostic indicator. Twenty-six resection specimens of pancreatic adenocarcinoma were examined by immunohistochemistry using an antigen retrieval solution and monoclonal PAb1801 and polyclonal CM1 antibodies on paraffin-embedded material. Specific nuclear p53 expression for both PAb1801 and CM1 was identified in seven cases (27%). In all cases immunoreaction was confined to neoplastic cells. Three of four (75%) tumors from patients who had never smoked showed immunoreaction, whereas only three of 14 (21%) tumors from smokers showed positive staining. Cases with positive staining had shorter mean survival (6.3 mo) than cases that failed to stain (9.8 mo), but the difference was not statistically significant in this small study. There was no statistically significant association between p53 immunoreactivity and other clinicopathologic parameters. Our findings indicate that abnormalities of p53 gene in pancreatic adenocarcinomas may not be directly related to cigarette smoking. Those patients who survived the longest tended to have tumors negative for p53 immunostaining. p53 immunoreaction may be a useful feature in distinguishing adenocarcinoma from chronic pancreatitis in small biopsies.

In a previous study, we found that total body irradiation (TBI) was essential to induce acute graft-versus-host disease (GVHD) after allogeneic H-2-incompatible splenocyte (SP) transplantation in SCID mice. SCID mice (H-2d) conditioned with cyclophosphamide and transplanted intravenously (IV) with 5 x 10(7) C57BL/6 (H-2b) SP developed chronic GVHD within 3 months posttransplant without any evidence of preceding acute GVHD. In this study, SCID mice were conditioned with 4 Gy TBI or non-TBI regimens, either BuCy2 (busulfan 4 mg/kg/d + cyclophosphamide 100 mg/kg/d for 2 days) or Cy5 (cyclophosphamide 100 mg/kg/d for 5 days), and then transplanted IV with 5 x 10(7) SP. The TBI-conditioned mice were further divided into tree transplant groups: (1) TBI and SP administered the same day (TBI + D0 SP), (2) SP administered 4 days post-TBI (TBI + D4 SP), and (3) SP administered 7 days post-TBI (TBI + D7 SP). The severity of GVHD was compared among these groups by clinical and histologic grading. Twenty- eight of 28 mice treated with TBI + D0 SP died of acute GVHD, with overwhelming diarrhea by day 15 posttransplantation. Sixteen mice treated with either TBI + D4 SP or TBI + D7 SP developed acute GVHD, but none of them died of this disorder during 30 days posttransplantation. The mice conditioned with non-TBI regimens developed chronic GVHD within 3 months without showing any detectable signs of acute GVHD. Serum and in situ colonic cytokines were determined by enzyme-linked immunosorbent assay and immunohistology respectively. TBI itself significantly increased both serum and colonic tumor necrosis factor-alpha (TNF-alpha), interleukin-1 alpha (IL-1 alpha), and IL-6 when compared with non-TBI regimens and normal controls. TNF-alpha appeared in the serum and colon 4 hours post-TBI and peaked in 24 hours, followed by increasing IL-1 alpha and then IL-6 levels. TNF-alpha and IL-1 alpha decreased rapidly within 3 to 5 days post-TBI if no allogeneic cells were transplanted. Histoincompatible transplantation augmented cytokine release, which remained elevated on day 10 in these animals. Mice treated with TBI + D0 SP developed the most severe acute GVHD and had the highest levels of TNF-alpha, IL-1 alpha, and IL-6. The BuCy2-conditioned mice had the lowest cytokine levels and developed no acute GVHD. When the mice transplanted with TBI + D0 SP were treated immediately with recombinant soluble human TNF receptor (rhuTNFR:Fc) 100 micrograms/d intraperitoneally and for the subsequent 15 days acute GVHD mortality was significantly reduced from 100% to 50% (P < .001).

Cytologic evaluation of body cavity fluids is useful to detect malignancy within the pleural and peritoneal spaces. A definitive diagnosis cannot always be made on cytologic evaluation alone. As malignant processes may show abnormal DNA content, DNA analysis of effusions may be useful. Therefore, we determined the DNA content of 37 effusions by flow cytometry (FC) and image analysis (IA) using the CAS 200. Of the 37 fluids evaluated, 18 were cytologically malignant, 15 benign, and four atypical. Overall, 22 fluids (60%) showed concordance between FC and IA. None of the benign fluids were aneuploid. All showed diploid histograms or diploidy with increased proliferating cells. Three of four atypical fluids had increased proliferating cells by either FC or IA, whereas one was diploid by both methods. Aneuploidy was detected in 13 malignant fluids: five were aneuploid by both methods and eight by only one method. IA identified aneuploidy in five of those eight cases, while three were identified by FC. Three of the cytologically malignant fluids were diploid by both methods, and two showed increased proliferating cells by IA and diploidy by FC. The specificity of both methods was 100%. However, the sensitivity of identifying a malignant fluid by aneuploidy is low, 44% for FC and 55% for IA. IA appears to identify small aneuploid populations more frequently than FC. The detection of aneuploidy in effusions is highly suggestive of malignancy, and the combination of both techniques gives the highest detection rate (72%). However, neither are as sensitive as traditional cytologic evaluation with the occasional use of additional histochemical stains. © 1994 Wiley-Liss, Inc.

Murine syngeneic graft-versus-host disease (SGVHD) results in chronic colon and liver inflammation following syngeneic bone marrow transplantation (BMT) and treatment with the calcineurin inhibitor, cyclosporine A (CsA). SGVHD was initially thought to arise as a result of an autoreactive immune response, but more recently it has been shown that enhanced antimicrobial responses develop in SGVHD mice. Consequently, we performed studies to analyze the role of the microbiota in the development of murine SGVHD. Treatment with broad-spectrum antibiotics eliminated disease-associated inflammatory immune responses and pathology, linking the role of the microbiota and microbial-specific immunity to the development of murine SGVHD. In a broader context, these results bring into question the role that anti-microbial immune responses play in post-transplant immune pathologies that develop following allogeneic stem cell transplantation and use of calcineurin inhibitors.

Whereas T lymphocytes are essential for the initiation of acute graft-versus-host disease (aGVHD), it is not at all clear whether they or other cells or noncellular factors actually mediate the characteristic lesions. This report describes the in vivo effects of human NK cells, T cells, and cytokines on the induction of aGVHD in 4 Gy sublethally irradiated C.B-17 scid/scid (SCID) mice. Human NK and T lymphocytes were obtained separately by antibody- and complement-mediated negative selection from the peripheral blood of normal donors and expanded in medium containing rIL-2 and irradiated autologous feeder cells. The characteristics of the two groups of cells were analyzed before injection into SCID mice. Cytofluorometric phenotyping demonstrated that 70-95% of NK-enriched cells expressed CD3-, CD16+, CD56+, and CD8-dim+; ninety-seven per cent of T cells expressed CD3+, TCR-alpha/beta+, CD4+, or CD8-bright+. Analysis of K562 and Daudi cultured target cell lines demonstrated 40-50% higher cytotoxicity by NK-enriched cells as compared with activated T lymphocytes. TNF-alpha cytokine production was greatly increased in activated NK cells (250 pg/ml) as compared with T cells (25 pg/ml) and fresh PBMC (12.5 pg/ml). IFN-gamma was increased in both NK and T cells. After i.v. injection of 1-5 x 10(7) cells into irradiated SCID mice, minor to severe skin lesions, diarrhea, and weight loss occurred in NK- but not the T cell-injected animals. In NK-injected animals, thinning and focal loss of epithelium with pyknotic nuclear change and degeneration and loss of skin appendages were observed. Single cell necrosis, crypt abscess formation, and loss of glandular epithelium developed in the colon of NK but not in T cell-injected animals. These findings are very similar to allogeneic aGVHD in SCID mice injected with C57BL/6 mouse splenocytes. Immunohistological staining with anti-human CD56, CD3, TNF-alpha, and IFN-gamma antibodies demonstrated CD56+ cells in association with TNF-alpha and IFN-gamma secretion in the bowel of NK-injected animals. CD3+ cells were not found in the same tissues. These findings were not observed in T cell-injected and control mice. In summary, aGVHD-like lesions were induced by transplantation of xenogeneic human activated NK cells into SCID mice. We hypothesize that cytokines released from human NK cells play a central role in the pathogenesis of clinical aGVHD.

In an exclusive eLearn Magazine article, an e-learning all star team of authors defines the new learning age, approaching in the next 2 to 5 years: Terra Nova! Unlike the industrial age, when workers were told they were not paid to think, or the information age, when people were encouraged to think but only "inside the box," Terra Nova embraces a dynamic flow of power, authority, know-how, and trust. Change is so fast and furious that work and learning blur into one activity. Workers respond to novel situations as best they see fit, governed by the organization's values and their own gut feelings. Read on to learn about the new learning landscape.

Purpose To evaluate the subjective and objective results of surface replacement arthroplasty (SRA) for arthritis of the proximal interphalangeal (PIP) joint using the PIP-SRA implant. Emphasis is placed on causes of complications, failures, and techniques used for revision. Methods This is a retrospective review of 43 surface replacement PIP joint arthroplasties performed in 25 patients using the PIP-SRA implant. Subjective results were obtained through a mailed questionnaire. Pre- and postoperative ranges of motion were obtained for PIP joints and DIP joints. X-rays were evaluated for signs of subsidence, periprosthetic radiolucency, loosening, or stress-shielding. Joints requiring revision were separately analyzed. Results The average follow-up time was 37 months (range, 12 to 72 months). The average active PIP joint arc of motion went from 57° before surgery to 58° after surgery, excluding 2 joints that were salvaged with arthrodesis. The average active DIP joint arc of motion went from 36° before surgery to 24° after surgery, excluding arthrodeses. Satisfaction rating revealed 26 very satisfactory (60%), 12 fairly satisfactory (28%), and 5 not satisfactory (12%). Thirty-three patients rated their joint pain better, 3 joints were unchanged, and 7 were worse. Eleven (26%) arthroplasties failed, requiring major revision (arthrodesis or replacement of 1 or both components) for pain. Ten of 11 revisions were due to loosening associated with the lack of cement. Revision procedures produced satisfactory results in 8 of 11 joints. Conclusions Surface replacement arthroplasty of the PIP joint holds promise for the future. It offers motion and stability for the index finger unattainable with silicone arthroplasty. Our results do not differ notably from those of other series using this implant, except that failures due to loosening in our study were almost exclusively associated with the lack of cement. Therefore, we recommend using cement with the PIP-SRA implant in every case until superior long-term results can be demonstrated using uncemented components. Proximal interphalangeal joint arthroplasty is an exacting procedure no matter what technique or implant is used, and no one technique has yet been proven superior to all others. Type of study/level of evidence Therapeutic IV.

Two different doses of Ross River virus (RR) were fed to Ochlerotatus vigilax (Skuse), the primary coastal vector in Australia; and blood engorged females were held at different temperatures up to 35 d. After ingesting 10(4.3) CCID50/mosquito, mosquitoes reared at 18 and 25 degrees C (and held at the same temperature) had higher body remnant and head and salivary gland titers than those held at 32 degrees C. although infection rates were comparable. At 18, 25, and 32 degrees C, respectively, virus was first detected in the salivary glands on days 3, 2, and 3. Based on a previously demonstrated 98.7% concordance between salivary gland infection and transmission, the extrinsic incubation periods were estimated as 5, 4, and 3 d, respectively, for these three temperatures. When Oc. vigilax reared at 18, 25, or 32 degrees C were fed a lower dosage of 10(3.3) CCID50 RR/mosquito, and assayed after 7 d extrinsic incubation at these (or combinations of these) temperatures, infection rates and titers were similar. However, by 14 d, infection rates and titers of those reared and held at 18 and 32 degrees C were significantly higher and lower, respectively. However, this process was reversible when the moderate 25 degrees C was involved, and intermediate infection rates and titers resulted. These data indicate that for the strains of RR and Oc. vigilax used, rearing temperature is unimportant to vector competence in the field, and that ambient temperature variations will modulate or enhance detectable infection rates only after 7 d extrinsic incubation. Because of the short duration of extrinsic incubation, however, this will do little to influence RR epidemiology, because by this time some Oc. vigilax could be seeking their third blood meal, the latter two being infectious.

The incidence and severity of GVHD following bone marrow transplantation increases with recipient age. The role of recipient age on the development of GVHD was analyzed in a semi-allogeneic (C57BL/6-->(C57BL/6 x DBA/2)F1) murine GVHD system. Young adult (2 months) and old (12-14 months) recipient mice were lethally irradiated and reconstituted with young adult T cell-depleted bone marrow (ATBM) or ATBM and young spleen cells. A significantly higher percentage of old vs young recipients developed lethal GVHD. Furthermore, while pre-transplant conditioning with irradiation was not required to observe increased mortality in old recipients, irradiation predisposed the older animals for a more severe course of GVHD, suggesting that GVHD occurred in old compared to young animals in the absence of pre-transplant conditioning but was exacerbated by irradiation. Histologically, the immunological responses in the GVHD target organs were more severe in the old GVHD animals. In support of this observation, increased spontaneous proliferation was observed using lymphoid cells isolated from old vs young GVHD mice. These findings demonstrate that old recipients develop a more severe course of GVHD following BMT, and may present a unique opportunity to study age-related factors in the generation of GVHD.

Objective. The utility of an antibody to proliferating cell nuclear antigen (PCNA), a growth-specific nuclear protein, was assessed as a prognostic variable for prostatic adenocarcinoma. Its expression was correlated with established prognostic indicators, including tumor grade, stage, prostattc-specific antigen (PSA), and percent of tumor in the gland at excision. Methods. Forty archival needle biopsies containing a minimum of four hundred tumor cells were analyzed. Immunoperoxidase staining of paraffin sections was performed for PCNA (PC 10) after pretreatment in antigen retrieval solution. A proliferative index (PI) for each case was derived using image analysis with measurement of at least four hundred twenty-five nuclei. Results. PI values ranged from 2.4 to 31.3 percent. Mean PI values varied significantly (ANOVA, p = 0.005) among cases with dominant Gleason grade (DGG) of 3 (mean PI = 9.3%), 4 (mean PI = 13.7%), and 5 (mean PI = 18.8%). By t test, significant differences were noted for PI in cases with DGG 2 and 3 versus those with DGG 4 and 5 ( p = 0.0065). PI for cases with DGG 3 versus 5 showed significant difference (p = 0.0017). Tumors of Gleason scores 5 to 7 differed significantly from those with scores 8 to 10 (p = 0.014). A statistical relationship for PI and PSA, clinical stage, and percent tumor at resection could not be established by linear regression. Conclusions. These findings suggest that additional study of the PI, as determined by PCNA immunohistochemistry and image analysis, may be warranted to determine its usefulness as an adjunctive parameter in prostate adenocarcinoma. This technique may be particularly useful in needle biopsies where limited tumor may render assessment of grade difficult.

Clinical acute graft-versus-host disease (aGVHD) was correlated with alterations in PBL phenotype and skin immunohistology in 52 patients transplanted with HLA-identical bone marrow. Concurrent with the emergence of aGVHD, there was a profound decrease in absolute number of CD3- T cells and an increase in CD3-CD16+, CD56+ (a subset of which coexpress CD8+ "dim") NK cells in the PBL. CD4+ T and CD20+ B lymphocytes failed to recover within 90 days in the patients with grades II-IV aGVHD. Ex vivo partial T cell depletion, in itself, did not significantly impair T cell recovery as compared to that in non-T-depleted recipients unless aGVHD occurred. Although leukocytic cellular infiltration in the skin was generally sparse, CD16+ NK lymphocytes were significantly increased in grades II-IV aGVHD. By contrast, there was no significant increase in CD3+, CD4+, or CD8+ lymphocytes in these lesions as compared to skin biopsies obtained from BMT patients without aGVHD or from normal skin. Taken together, these findings suggest that NK cells may be important in the pathogenesis of human aGVHD.

Twenty-five convex condylar silicone arthroplasties were done for treatment of arthritis confined to the basal joint of the thumb. The procedure was done in 19 patients with osteoarthritis and in 6 patients with rheumatoid arthritis. The average follow up was 4 1/2 years. This series of condylar arthroplasties is compared with a series of 24 Swanson trapezial arthroplasties, all done for treatment of osteoarthritis, with an average follow up of 5 1/2 years. The convex condylar arthroplasty is associated with a 15% failure rate in patients with osteoarthritis coupled with radiographic findings of significant bone resorption around the stem of the prosthesis in 84% of the remaining patients. The three failures were in the osteoarthritic thumbs and not in the rheumatoid thumbs. Fusion and tendon interposition arthroplasty are described as options for revision. We believe that the Swanson convex condylar hemitrapezium replacement should be reserved for the low-demand rheumatoid thumb.

Cholestyramine, chitosan, and oat gum are lipid-lowering compounds. Cholestyramine use in humans may contribute to colonic adenocarcinoma; chitosan and oat gum are being studied in the rat to determine their potential for human use. To compare these compounds, we fed three groups of 10 male Sprague-Dawley rats one of the substances at 5% of diet with 1% cholesterol and 0.2% cholic acid; two other groups were fed cellulose with and without 1% cholesterol and 0.2% cholic acid. All groups had similar food intake and weight gains. Cholesterol feeding increased total liver lipids almost 3-fold and liver cholesterol concentration almost 10-fold. Cholestyramine, oat gum, and chitosan all significantly lowered liver cholesterol with cholestyramine feeding yielding levels identical to the noncholesterol-fed basal group. Chitosan and oat gum lowered liver cholesterol moderately. Cholestyramine and chitosan both significantly lowered serum cholesterol compared to the cellulose group. Oat gum was less effective. Hemoglobin and serum iron were similar in all groups except the oat gum group, which had decreased serum iron. Histological examination of small and large bowel with morphometry revealed statistically significant increases in both proximal and distal small bowel and distal large bowel mucosal thickness in the cholestyramine-fed group. No changes were noted in the proximal large bowel. Neither chitosan nor oat gum produced mucosal change other than an increase in the distal small bowel with the oat gum diet. Chitosan may have lipid-lowering effects similar to those of cholestyramine without the deleterious changes in intestinal mucosa.

From January 1981 through 1983 80 cadaver donor renal allografts were transplanted at a single center utilizing prospective HLA-DR matching. All patients received at least two blood transfusions prior to transplantation. One year actual allograft survival of 77% for initial grafts and 57% for retransplantation was observed. When there was no DR mismatch the results were 84% and 80% respectively. Only 6% of no-DR-mismatch initial grafts were lost to rejection or patient death. These significantly better results were associated with decreased incidence of acute rejection episodes with transplants well matched for DR. Matching for A and B locus antigens conveyed no benefits in this series. Use of prospective DR matching for donor/recipient selection also resulted in efficient transplantation. Patients receiving initial grafts waited an average of 3.9 months while retransplanted patients waited an average of 13.5 months after being entered on the waiting list. The data suggest that if all transplant centers would preferentially share kidneys regionally on the basis of DR matching, nearly all patients could receive timely allografts with no DR mismatch and good results at one year with conventional immunosuppressive therapy.

Syngeneic graft-versus-host disease has been shown to occur in syngeneic rat radiation chimeras after treatment with a short course of CsA. However, data concerning this model have been controversial in murine systems. We have successfully induced a GVHD-like syndrome in syngeneic mouse radiation chimeras treated transiently with CsA. Lethally irradiated (950 rads) DBA/2 mice were reconstituted with syngeneic bone marrow and treated daily, i.p. with 15 mg/kg CsA in olive oil for 21 days. Within 1 week after discontinuing CsA, animals developed clinical signs of GVHD including runting, hunched posture, and severe diarrhea. This disease was fatal for greater than 80% of treated animals within 4 weeks after cessation of CsA. Furthermore, the induction of syngeneic GVHD did not appear to be linked to a particular MHC haplotype. Histologically, there was pronounced lymphoid atrophy of the spleen and thymus. Sections of large intestine showed an acute inflammatory process involving the mucosal layer ranging from single-cell destruction to complete mucosal ulceration. This murine model of GVHD should provide new opportunities for studying the development and regulation of autoimmune processes.

We measured the activity of a non-lysosomal alpha-glucosidase with pH optimum near 6.0 in serum from a wide variety of patients, using the fluorogenic substrate, 4-methylumbelliferyl-alpha-D-glucopyranoside. Acutely ill patients with cystic fibrosis (CF) demonstrated significant increases in alpha-glucosidase compared with CF outpatients. The former group of CF patients experienced far more severe chronic pulmonary disease than did the latter, whereas both groups had similar degrees of gastrointestinal impairment. Patients with pancreatitis associated with trauma or complicated by severe necrosis, hemorrhage, or abscess also displayed greater increases in alpha-glucosidase than did patients with uncomplicated (edematous) pancreatitis. For CF outpatients and patients with either edematous pancreatitis or pancreatic cancer, the alpha-glucosidase activity was similar to that for the general hospital-patient population. Corresponding changes were not observed for other measured serum glycosidases (alpha-fucosidase, alpha-mannosidase, beta-glucuronidase, beta-N-acetylglucosaminidase). Measurement of serum alpha-glucosidase may be of value in assessing the clinical course in CF and in differentiating necrotizing from edematous pancreatitis.

A procedure for the radiochemical determination of 60Co in low-activity samples of sediment and biological material is described. Cobalt recovery is high and decontamination from tervalent lanthanides and naturally-occurring radionuclides is complete. Cobalt is precipitated with 1-nitroso-2-naphthol, decontaminated from iron by precipitation of the iron as ferric phosphate, extracted into methyl isobutyl ketone, and finally precipitated as cobalt mercury(II) thiocyanate for yield determination and beta-counting.

Theophylline has been shown previously to inhibit a number of cellular immune functions of granulocytes and T-lymphocytes. In the present report, we demonstrate that theophylline, in a dosedependent fashion, suppresses human natural killer (NK) cell activity in vitro. To determine if theophylline produces quantitative or qualitative alterations in NK cells in vivo we quantitated peripheral blood NK cells with three monoclonal antibodies and FACS analysis and measured NK cytolytic activity in eight normal volunteers who took theophylline for eight days. No change was noted in the number or cytolytic activity of NK cells over the eight days of monitoring. We conclude that theophylline does not alter NK cells in vivo when given in therapeutic doses.

Background: Following COVID-19 exposure, the CDC recommends a 10-14 day quarantine for asymptomatic individuals and more recently a 7 day quarantine with a negative PCR test. We performed a university-based prospective student cohort study to determine if early PCR negativity predicts day 14 negativity., Methods: We enrolled 101 asymptomatic, quarantining, students, performed nasopharyngeal swabs for viral testing on days 3 or 4, 5, 7, 10 and 14 and determined the proportion of concordant negative results for each day versus day 14 with a two-sided 95% exact binomial confidence interval., Results: Overall, 14 of 90 (16%, 95% CI: 9% - 25%) tested positive while in quarantine, with 7 initial positive tests on day 3 or 4, 5 on day 5, 2 on day 7, and none on day 10 or 14. Rates of concordant negative test results are: day 5 vs. day 14 = 45/50 (90%, 95% CI: 78% - 97%); day 7 vs. day 14 = 47/52 (90%, 95% CI: 79% - 97%); day 10 vs. day 14 = 48/53 (91%, 95% CI:79% - 97%), with no evidence of different negative rates between earlier days and day 14 by McNemar's test, p > 0.05., Conclusions: The 16% positive rate supports the ongoing need to quarantine close contacts of COVID-19 cases, but this prospective study provides the first direct evidence that exposed asymptomatic students ages 18-44 years in a university setting are at low risk if released from quarantine at 7 days if they test negative PCR test prior to release.