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Purpose: To assess whether the COVID-19 pandemic had an influence on presentation of testicular torsion and/or increase in the frequency of orchiectomy. Patients and Methods. This retrospective study included boys under 18 years of age with testicular torsion divided in two groups: pre-COVID operated in 2019 vs. COVID-19 group from 2020. We compared demographic data as well as local and general symptoms. We analyzed additional tests, intraoperative findings, length of operation and hospitalization, and followup. Results. We analyzed the data collected from 44 patients (24 boys from first group vs. 20 boys from second group). The median age was 13.4 years vs. 14.5 years in the latter. The median time of symptoms duration was 6.5 hours and 8.5 hours, respectively. The main manifestation was testicular pain without additional signs. The results of the laboratory tests did not reflect local advancement. In the 2019 group, Doppler ultrasound showed absent blood flow in the affected testicle in 62% vs. 80% in 2020. The mean time from admission to surgery was virtually identical: 75 minutes in 2019 vs. 76 minutes in 2020. The mean duration of scrotal revision was similar in both groups. There was only one significant difference: the degree of twisting. In 2019, the mean was 360° vs. 540° in 2020. Incidence of orchiectomy also did not significantly vary between the analyzed time periods, with 21% during the pandemic and 35% during the pre-COVID-19 period. Conclusion. We did not observe an increase in the number of testicular torsion cases during the COVID-19 pandemic. Most importantly, the rates of orchiectomy did not significantly differ between the patients with testicular torsion presenting during the COVID-19 outbreak., Competing Interests: The authors declare that there are no conflicts of interest., (Copyright © 2023 Marta Komarowska et al.)

Esophageal atresia with or without tracheoesophageal fistula (EA/TEF) is the most common congenital malformation of the upper digestive tract. This study represents the first genome-wide association study (GWAS) to identify risk loci for EA/TEF. We used a European case-control sample comprising 764 EA/TEF patients and 5,778 controls and observed genome-wide significant associations at three loci. On chromosome 10q21 within the gene CTNNA3 (p = 2.11 × 10 -8 ; odds ratio [OR] = 3.94; 95% confidence interval [CI], 3.10-5.00), on chromosome 16q24 next to the FOX gene cluster (p = 2.25 × 10 -10 ; OR = 1.47; 95% CI, 1.38-1.55) and on chromosome 17q12 next to the gene HNF1B (p = 3.35 × 10 -16 ; OR = 1.75; 95% CI, 1.64-1.87). We next carried out an esophageal/tracheal transcriptome profiling in rat embryos at four selected embryonic time points. Based on these data and on already published data, the implicated genes at all three GWAS loci are promising candidates for EA/TEF development. We also analyzed the genetic EA/TEF architecture beyond the single marker level, which revealed an estimated single-nucleotide polymorphism (SNP)-based heritability of around 37% ± 14% standard deviation. In addition, we examined the polygenicity of EA/TEF and found that EA/TEF is less polygenic than other complex genetic diseases. In conclusion, the results of our study contribute to a better understanding on the underlying genetic architecture of ET/TEF with the identification of three risk loci and candidate genes., Competing Interests: The co-author C.M.B. declares the following interests: Shire (grant recipient, Scientific Advisory Board member), Idorsia (consultant), Lundbeckfonden (grant recipient), Pearson (author, royalty recipient), and Equip Health Inc. (Clinical Advisory Board). All other co-authors declare no competing interests., (© 2022 The Authors.)

SARS-CoV-2 is a highly contagious virus causing mainly respiratory track disease called COVID-19, which dissemination in the whole world in the 2020 has resulted in World Health Organisation (WHO) announcing the pandemic. As a consequence Polish Government made a decision to go into a lockdown in order to secure the population against SARS-CoV-2 outbreak what had its major influence on the Polish Health Care System. All of the social and medical factors caused by the pandemic might influence children's health care, including urgent cases. The aim of this survey was the analysis of medical charts with focus on the course and results of surgical treatment of children who underwent appendectomy before and during the COVID-19 pandemic. Material and methods: We performed analysis of charts of 365 subjects hospitalized in the Pediatric Surgery Department from 1st January 2019 to 31st December 2020 because of acute appendicitis. Patients were divided into two groups-those treated in 2019-before pandemic outbreak, and those treated in 2020 in the course of pandemic. Results: the most common type of appendicitis was phlegmonous (61% of cases in 2019 and 51% of cases in 2020). Followed by diffuse purulent peritonitis (18% of cases in 2019 vs 31% of cases in 2020), gangrenous (19% of cases in 2019 vs 15% of cases in 2020) and simple superficial appendicitis (1% of cases in 2019 vs 3% of cases in 2020). There was statistically significant difference in the length of hospitalization: in 2019 the mean length of hospi-talization was 4.761 vs 5.634 in 2020. Laparoscopic appendectomy was performed more frequently before the COVID period (63% of cases treated in 2019 vs 61% of cases treated in 2020). In the pandemic year 2020, there was double increase in the number of conversion from the laparoscopic approach to the classic open surgery. In the year 2019 drainage of abdominal cavity was necessary in 22% of patients treated with appendectomy, in 2020 the amount of cases threated with appendectomy and drainage increased to 32%. Conclusions: fear of being infected, the limited availability of appointments at General Practitioners and the new organisation of the medical health care system during pandemic, delay proper diagnosis of appendicitis. Forementioned delay leads to higher number of complicated cases treated with open appendectomy and drainage of abdominal cavity, higher number of conversions from the laparoscopic to classic open technique, and longer hospitalization of children treated with appendectomy in the year of pandemic., (© 2021. The Author(s).)

Objective: to explore the association of plasma concentrations of bisphenol A (BPA), bisphenol S (BPS), and bisphenol F (BPF) with unilateral cryptorchidism. In addition, to analyze selected demographic and intraoperative characteristics., Design: Retrospective analysis to determine plasma concentrations of total BPA, BPS and BPF using gas chromatography - mass spectrometry (GC-MS) among prepubertal boys with cryptorchidism and prebupertal male control subjects. During operation, the size, turgor and location of the cryptorchid testes were assessed., Main Outcome Measure: Plasma concentrations of total BPA, BPS and BPF., Results: In children with cryptorchidism, plasma levels of BPA, BPS and BPF were significantly higher compared to the control subjects. For BPA, it was: median value: 9.95 ng/mL vs . 5.54 ng/mL, p<0.05. For BPS, it was: median value: 3.93 ng/mL vs . 1.45 ng/mL, p<0.001. For BPF, it was: median value: 3.56 ng/mL vs . 1.83 ng/mL, p<0.05. In cryptorchid group, BPA was detected in 61.4% samples, BPS in 19.3% and BPF in 19.3%. All the three bisphenols were detected in plasma samples of both the healthy subjects and the study cohort. In the latter group, we found significant higher levels of BPA in boys from urban areas. We found a weak positive correlation between the levels of BPS and BPF and reduced turgor of the testes. Furthermore, results showed weak positive correlations between BPA and BPS levels and the age of the children as well as between BPS and BPF concentrations and the place of residence., Conclusions: Results provide a first characterization of prepubertal boys suffering from cryptorchidism and exposed to different kind of bisphenols. Our study suggests that cryptorchid boys are widely exposed to BPA and, to a lesser extent, also to its alternatives, such as BPS and BPF., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Komarowska, Grubczak, Czerniecki, Hermanowicz, Hermanowicz, Debek and Matuszczak.)

Ubiquitin C-terminal hydrolase 1 (UCHL1) is an enzyme unique for its multiple activity - both ligase and hydrolase. UCHL1 was first identified as an abundant protein found in the brain and testes, however its expression is not limited to the neuronal compartment. UCHL1 is also highly expressed in carcinomas of various tissue origins, including those from brain, lung, breast, kidney, colon, prostate, pancreas and mesenchymal tissues. Loss-of-function studies and an inhibitor for UCHL1 confirmed the importance of UCHL1 for cancer therapy. So far biological significance of UCHL1 was described in the following processes: spermatogenesis, oncogenesis, angiogenesis, cell proliferation and differentiation in skeletal muscle, inflammation, tissue injury, neuronal injury and neurodegeneration., (© 2020 John Wiley & Sons Ltd.)

Purpose: Laminin 5 and collagen IV are the main compounds of the extracellular matrix of the germinal epithelium. The purpose of this study was to evaluate the concentration of these two markers of fibrosis in the plasma of boys with congenital unilateral cryptorchidism., Materials and Methods: The study group comprised 43 boys aged 1-3 years with congenital unilateral cryptorchidism. The control group included 54 healthy, age matched boys, admitted for planned hernioplasty. To assess laminin 5 and collagen IV in the plasma of boys with unilateral cryptorchidism, we used a new biosensor with Surface Plasmon Resonance Imaging technique detection., Results: The median concentration of laminin 5 and collagen IV in the serum of boys with congenital, unilateral cryptorchidism was higher than in boys with normal scrotal testis. The difference was statistically significant (p < 0.0001). We did not notice a correlation between a higher position of the testicles in the inguinal and/or their condition and levels of laminin 5 and collagen IV in the plasma., Conclusion: Laminin 5 and collagen IV concentrations in the plasma were higher in patients with congenital unilateral cryptorchidism. We believe that in the future, our results could be compared with fertility level in adulthood., Competing Interests: Declaration of competing interest The authors declare no conflict of interests., (Copyright © 2019 The Authors. Published by Elsevier B.V. All rights reserved.)

The matrix metalloproteinases are enzymes capable of remodeling of extracellular matrix, and modulate the behavior of cells. Maturation of gubernaculum and spermatogenesis demand proper equilibrium of metalloproteinases and their inhibitors. The aim of this survey was to investigate the levels of matrix metalloproteinase type 1 (MMP-1) and matrix metalloproteinase type 2 (MMP-2) in the plasma of children with unilateral cryptorchidism along with levels of Insulin-like Peptide 3 (INSL3) and inhibin B. INSL3 have a role in gubernaculum development. Inhibin B is produced by Sertoli cells, and its levels reflect the status of the testis germinative epithelium. Fifty boys with an undescended testicle, aged 1-4 years (median = 2.4 years) were enrolled into the study. Fifty boys with inguinal hernia aged 1-4 years, served as controls (median age = 2.1 years). Investigators assessed the MMP-1 and MMP-2 concentrations using Surface Plasmon Resonance Imaging. The levels of INSL-3 and inhibin B were assessed using commercial enzyme-linked immunosorbent assay ELISA. The median concentration of MMP-1 and MMP-2 in the blood plasma of patients with unilateral cryptorchidism, was nearly 2-folds higher than in controls. The great area under the ROC curve with the cut off value of 0.865 for MMP-1, and 0.819 for MMP-2, indicates the high clinical sensitivity and specificity of the test of plasma levels of MMP-1 and MMP-2 for boys with cryptorchidism. The increased plasma levels of MMP-1 and MMP-2, probably reflect the level of apoptosis of the germ cells in undescended testicles, in response to the heat stress during the period of prepubertal testis development. In the group of cryptorchid boys, we found slightly lower concentrations of INSL3, without statistical significance and without correlation with MMP-1 and MMP-2 levels. There were no significant differences in the levels of inhibin B in the group of boys with cryptorchidism and boys with inguinal hernia and it also did not correlate with MMP-1 and MMP-2 concentrations.

Bisphenol A (BPA) has been used since the 1950s, in food packaging, industrial materials, dental sealants, and personal hygiene products. Everyone is exposed to BPA through skin, inhalation, and digestive system. BPA disrupts endocrine pathways, because it has weak estrogenic, antiandrogenic, and antithyroid activities. Despite the rapid metabolism, BPA can accumulate in different tissues. Many researchers proved the impact of BPA on human development, metabolism, and finally reproductive system. There is increasing evidence that BPA has impact on human fertility and is responsible for the reproductive pathologies, e.g., testicular dysgenesis syndrome, cryptorchidism, cancers, and decreased fertility in male and follicle loss in female.

The aim of this study was to determine the immunoproteasome concentration in blood plasma of pediatric patients with moderate and major burns and its correlation with circulating proteasome and ubiquitin carboxyl-terminal hydrolase L1 (UCHL1) with surface plasmon resonance imaging biosensor. The study population comprised of 30 patients with moderate (n = 21) and severe burns (n = 9), aged 9 months to 14 years. The control group represented 18 healthy, age-matched patients, admitted for herniotomy. Exclusion criteria were as follows: admission to the hospital later than 6 hours after burn, cardiovascular or immunological diseases, and severe preexisting infections. Mean concentrations of immunoproteasome, 20S proteasome, and UCHL1 in the blood plasma of children with burns-4 to 6 hours, 12 hours, 3 days, 5 days, and 7 days after thermal injury-were above the levels measured in controls. The immunoproteasome, 20S proteasome, and UCHL1 concentrations in the blood plasma of their patients were highest 12 hours after burn, slowly decreased over time, and on the 5th day still were higher than in controls (P < .05). There was a strong correlation between immunoproteasome and 20S proteasome concentrations 6 hours and 5 days after burn, and moderate correlation 12 hours after burn (P < .05). The immunoproteasome concentration is elevated after burn injury and slowly reaches the normal range during the wound healing process. There is strong correlation between immunoproteasome and 20S proteasome concentrations in the serum of children with moderate and major burns. They did not find such correlation between immunoproteasome and UCHL1 concentrations. Immunoproteasome concentration do not correlate with age or sex.

The purpose of this study was the determination of matrix metalloproteinase-2 and its correlation with basal membrane components laminin-5 and collagen type IV in the blood plasma of burn patients measured with Surface Plasmon Resonance Imaging (SPRI) biosensors., Material and Methods: 31 children scalded by hot water who were managed at the Department of Paediatric Surgery between 2014-2015, after primarily presenting with burns in 4-20% TBSA were included into the study (age 9 months up to 14 years, mean age 2,5+1 years). There were 10 girls and 21 boys. Venous blood samples were drawn 2-6h, and 12-16h after the thermal injury, and on the subsequent days 3, 5 and 7. The matrix metalloproteinase-2, collagen type IV and laminin-5 concentrations were assessed using Surface Plasmon Resonance Imaging by the investigators blinded to the other data., Results: The MMP-2, laminin-5 and collagen type IV concentrations in the blood plasma of patients with burns, were highest 12-16h after thermal injury, the difference was statistically significant. The MMP-2, laminin-5 and collagen type IV concentrations measured 3 days, 5 days and 7 days after the thermal injury, slowly decreased over time, and on the 7th day reached the normal range, when compared with the concentration measured in controls., Conclusion: Current work is the first follow-up study regarding MMP-2 in burns. MMP-2, laminin-5 and collagen type IV levels were elevated early after burn injury in the plasma of studied patients, and were highest 12-16h after the injury. MMP-2, laminin-5 and collagen type IV levels were not proportional to the severity of the burn. We believe in the possibility that the gradual decrease of MMP-2, collagen type IV and laminin-5 concentrations could be connected with the process of healing, but to prove it, more investigation is needed in this area. The SPR imaging biosensor is a good diagnostic tool for determination of MMP-2, laminin-5 and collagen type IV in blood plasma of patients with burns., (Copyright © 2017 Elsevier Ltd and ISBI. All rights reserved.)

Blunt traumatic evisceration is extremely rare. We describe the case of a 20-month-old boy with stomach and small and large intestine evisceration after blunt trauma. Immediate laparotomy and surgical repair were performed. There was no injury, other than a small hole in the mesentery. The bowels were drained into the abdominal cavity, and the skin was closed. The patient recovered well.

Background: The ubiquitin-proteasome system regulate p53, caspase and Bcl-2 family proteins, and is crucial for the degradation of the defective germ cells in testes. Purpose: to evaluate the concentration of ubiquitin carboxyl-terminal hydrolase 1 (UCHL1) in the blood plasma of boys with cryptorchidism and if there is any correlation with patient age., Methods: Patients-50 boys aged 1-4 years (median = 2,4y.) with unilateral cryptorchidism. Exclusion criteria were: previous human chorionic gonadotropin treatment, an abnormal karyotype, endocrine or immunological disorders or any long-term medication. The control group-50 healthy, age matched boys (aged 1-4 years, median = 2,1y.), admitted to the Pediatric Surgery Department for planned herniotomy. To investigate UCHL1 in blood plasma of boys with cryptorchidism, we used a novel technique Surface PLASMON RESONANCE Imaging (SPRI)., Results: The median concentration of UCHL1 in the blood plasma of boys with cryptorchidism, was 5-folds higher than in boys with inguinal hernia, whose testicles were located in the scrotum. We also noticed statistically significant difference between UCHL1 levels in boys with cryptorchidism up to 2 years old, and above 2 years old. Older boys, whose testicles since birth were located in the inguinal pouch or in the abdominal cavity, had higher concentration of UCHL1 in their blood plasma, than boys from younger group. In the group of cryptorchid boys, we also found slightly lower concentrations of INSL3, without statistical significance and no correlation with UCHL1 levels., Conclusions: Uchl1 concentrations in the blood plasma of boys with cryptorchidism, may reflect the heat-induced apoptosis of germ cells. Higher UCHL1 concentrations in older boys with undescended testicles, probably express intensity of germ cell apoptosis, more extensive when testicles are subjected to heat-stress for longer period. Further analyses of UCHL1 may help to elucidate its role in mechanisms influencing spermatogenesis.

Background: Although several studies suggested hypoxia as an important microenvironmental factor contributing to inflammation and fibrosis in chronic liver diseases, the mechanism of this process is not fully understood. We considered hypoxia inducible factor (HIF-1α) as a key transcription factor in liver fibrosis. The aim of the study was to evaluate the mechanisms of signaling pathway during bile duct ligation (BDL)-induced liver fibrosis in rats., Methods: BDL animal model of liver fibrosis was used in the study. Male Wistar rats were divided randomly into two experimental groups: sham group (n = 15), BDL group (n = 30). Hydroxyproline (Hyp) content as a marker of collagen accumulation in liver of rats subjected to BDL was evaluated according to the method described by Gerling B et al. Expression of signaling proteins [integrin β 1 receptor, HIF-1α, nuclear factor kappa B (NF-κB), and transforming growth factor (TGF-β)] was evaluated applying Western-immunoblot analysis. In all experiments, the mean values for six assays ± standard deviations (SD) were calculated. The results were submitted to the statistical analysis using the Student's "t" test, accepting p < 0.05 as significant., Results: Ligation of bile ducts was found to increase Hyp content in rat liver, accompanied by increase of HIF-1α expression during 10 weeks after BDL. The Hyp level was time dependent. There was not such a difference in control group (p < 0.001). Simultaneously expression of NF-κB, TGF-β, β 1 -integrin receptor was significantly elevated starting from sixth week after ligation. Activity of metalloproteinases 2 and 9 in the livers were increased 1 week after surgery and remained increased until the end of the experiment., Conclusions: The mechanism of development of liver fibrosis involves activation of Matrix metalloproteinase-2 (MMP-2) and Matrix metalloproteinase-9 (MMP-9), upregulation of HIF-1α transcriptional activity and its related factors, NF-κB and TGF-β. It suggests that they may represent targets for the treatment of the disease.

Purpose: Recently, it has been emphasized that hepatic progenitor/oval cells (HPCs) are significantly involved in liver fibrogenesis. We evaluated the multipotential population of HPCs by transmission electron microscope (TEM), including relations with adherent hepatic nonparenchymal cells (NPCs) in rats with biliary fibrosis induced by bile duct ligation (BDL)., Methods: The study used 6-week-old Wistar Crl: WI(Han) rats after BDL for 1, 6, and 8 weeks., Results: Current ultrastructural analysis showed considerable proliferation of HPCs in experimental intensive biliary fibrosis. HPCs formed proliferating bile ductules and were scattered in periportal connective tissue. We distinguished 4 main types of HPCs: 0, I, II (bile duct-like cells; most common), and III (hepatocyte-like cells). We observed, very seldom presented in literature, cellular interactions between HPCs and adjacent NPCs, especially commonly found transitional hepatic stellate cells (T-HSCs) and Kupffer cells/macrophages. We showed the phenomenon of penetration of the basement membrane of proliferating bile ductules by cytoplasmic processes sent by T-HSCs and the formation of direct cell-cell contact with ductular epithelial cells related to HPCs., Conclusions: HPC proliferation induced by BDL evidently promotes portal fibrogenesis. Better understanding of the complex cellular interactions between HPCs and adjacent NPCs, especially T-HSCs, may help develop antifibrotic therapies in the future.

Purpose: Numerous genetic and endocrine factors are involved in the process of testicular descent, but only a few genetic causes have been reported in human. The aim of this study was to investigate the density and distribution of single nucleotide polymorphisms (SNPs) anti-Müllerian hormone (AMH) and AMHRII receptors in cryptorchid patients and determine potential hormone imbalance connected with undescended testes by assessing the levels of AMH, Insulin-like factor 3 (INSL3) and inhibin B., Materials and Methods: The serum hormone levels (AMH, INSL3 and inhibin B) were compared in the two groups - cryptorchidism (n=105) and control group (n=58). The frequency of AMHRII -482 A>G, AMHRII IVS 10+77 A>G, AMHRII IVS 5-6 C>T, and AMH Ile49Ser polymorphisms among cryptorchid boys were compared with the control group., Results: None of the hormones levels were different between the cryptorchid and the control groups. All cases of IVS 5-6 C>T homozygote and heterozygote mutation were accompanied by an IVS 10+77 A>G and 482 A>G homozygote and heterozygote mutation. Interestingly, in most cases of all four polymorphisms, homozygote recessive genotype was associated with cases of cryptorchidism. However, the groups of patients were too small to draw definite conclusions., Conclusion: The AMHRII -482 A>G, AMHRII IVS 10+77 A>G, AMHRII IVS 5-6 C>T and AMH Ile49Ser genotypes should be determined in a much larger group of boys with cryptorchidism., (Copyright © 2016 Medical University of Bialystok. Published by Elsevier Urban & Partner Sp. z o.o. All rights reserved.)

Background: Determination of proteasome concentration in blood plasma in children with burns, with the Surface Plasmon Resonance Imaging biosensor., Material and Methods: 35 children scalded by hot water, with burns in 4-20% TBSA were included into the study (age 9 months up to 14 years, mean age 2,5+1 years). Blood plasma 20S proteasome concentration was assessed in 2-6h, 12-16h, 3d, 5d, and 7d after injury using Surface Plasmon Resonance Imaging biosensor., Results: Statistically significant elevation of circulating 20S proteasome concentration was noted in all groups 12-16 hours after the injury; however, differences were more evident in children with the more severe burns. Circulating 20S proteasome concentration in the plasma was increased until day 7 in the group with severe burns, until day 5 in the group with moderate burns and until day 3 in the group with minor burns. Circulating 20S proteasome concentration in the plasma was highly correlated with burn severity., Conclusions: The SPR imaging biosensor can be used for determination of 20S proteasome in plasma of patients with burns. Circulating 20S proteasomes are elevated after burn injury and slowly reach the normal range during the wound healing process. Increase in circulating 20S proteasome concentration is proportional to the severity of the burn injury and do not correlate with age or sex., (© 2016 by the Association of Clinical Scientists, Inc.)

Aim: Infantile haemangiomas (IH) are neoplastic proliferations of endothelial cells which occur with an incidence of 10-12%. IH rapidly growing and found in cosmetically sensitive areas or complicated with ulcerations are of special concern of parents., Methods: A review of medical charts was performed for newborns treated with propranolol because of IH between 2012 and 2013. There were two boys and two girls, referred to our department at the age of 2-3 weeks. Children were commenced on propranolol 0.5 mg/kg daily and closely monitored. The dosage was increased up to a maximum of 2 mg/kg/d and was maintained until the lesion had involuted or showed good result., Results: The minimal dosage required to achieve involution was 1.5-2.0 mg/kg/d. No rebound growth or complications were observed. Three patients showed excellent response with resolution of the lesion. Fourth patient showed good result with >50% reduction of IH., Conclusions: Propranolol at 1.5-2.0 mg/kg/d is effective and safe for treating IH in our series of newborn patients. Treatment should be maintained until the lesion is involuted or shows good cosmetic result. Still there is need for larger scale studies confirming the safety and efficacy of propranolol in treatment of haemangiomas in newborns.

Cryptorchidism is one of the most common birth defects in male children, and it has a potential impact on future health. It is the best-characterized risk factor for reduced fertility and testicular cancer. However, the etiology of cryptorchidism remains largely unknown. In the literature, we find different opinions and theories on this topic. Probably, the etiology is multifactorial, and hormonal, genetic and environmental factors may regulate testicular development and descent from intra-abdominal location into the bottom of the scrotum. The descent of the testis is a complex, two-stage process. A critical role in testicular descent has been attributed to androgens, insulin-like hormone 3 (insl3) and anti-Müllerian hormone. It is believed that interaction between Leydig and Sertoli cells may cause impaired spermatogenesis. Based on recent knowledge of germ cell development, it is believed that the best treatment for undescended testis is orchiopexy between 6th and 12th month of life. Long follow-up studies are needed to focus on the effect of this recommendation.

We have developed a new method for highly selective determination of the ubiquitin carboxyl-terminal hydrolase L1 (UCH-L1) concentration using a surface plasmon resonance imaging (SPRI) technique and two different biosensors. UCH-L1 was captured from a solution by immobilized specific rabbit monoclonal antibody or specific LDN-57444 inhibitor due to formation of receptor-UCH-L1 complex on the biosensor surface. The analytically useful dynamic response range of both biosensors is between 0.1 and 2.5ng/ml. The detection limit is 0.06ng/ml for the biosensor with antibody and 0.08ng/ml for the biosensor with inhibitor. Biosensors based on both antibody and inhibitor were found to be suitable for quantitative determination of the UCH-L1 and exhibit good tolerance to the potential interferents. Both biosensors gave comparable results in the range of 0 to 0.20ng/ml for plasma samples and 0.30 to 0.49ng/ml for cerebrospinal fluid samples. To validate the new methods, comparative determination of UCH-L1 by the commercial enzyme-linked immunosorbent assay (ELISA) kit was performed. In general, in terms of UCH-L1 concentration, a good correlation between SPRI and ELISA was found. The developed biosensors can be used successfully for the determination of UCH-L1 in body fluids., (Copyright © 2014 Elsevier Inc. All rights reserved.)