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Drying techniques play vital roles in the post-harvest processing of medicinal plants because they control microbial growth and enzymatic breakdown of plant nutrients. Cymbopogon citratus possesses diverse medicinal values in different cultures. However, little is known about the effect of drying methods on the phytochemical and phenolic acid content of lemongrass. The study comparatively evaluated the effect of drying methods on phytochemical and phenolic acids in the stalk, root and leaf extract of Cymbopogon citratus. The phytochemical test was done by standard techniques while the phenolic acids were analyzed by the high-performance liquid chromatographic (HPLC) method. The presence of flavonoids, glycosides, alkaloids, saponins, phenols, and tannins was detected via qualitative phytochemical analyses. The results of the quantitative phytochemical analysis showed that the concentrations of terpenoi ds (2.63 to 2.00 mgLI/g extract) and saponins (4.60 to 3.79 mg DE/g extract) were significantly (p < 0.05) lower in all oven-dried samples. There was a significant difference (p < 0.05) in the alkaloids, saponins and terpenoids contents of shade- and oven-dried samples. The HPLC analysis of phenolic acids revealed higher concentrations of total phenolic (0.09 vs 25.35 mg GAE/g extract), caffeic (1.0 x 10-4 vs 4.5 x 10-4 mg/g extract) and coumaric (1.9 x 10-4 vs 4.5 x 10-4 mg/g extract) acids in the oven-dried compared with shade-dried samples. The study showed that the variations in the phytochemical and phenolic acids constituents of shade- and oven-dried tissues of C. citratus may provide useful data germane for determining lead compounds during post-harvest processing. [ABSTRACT FROM AUTHOR]

Morphea presenting clinically with nodular or keloidal skin changes is extremely rare. Nodular scleroderma or keloidal morphea presenting in a linear distribution is even more uncommon. We present an otherwise healthy young woman with unilateral, linear, nodular scleroderma and review the somewhat confounding earlier literature in this area. To date, this young woman's skin changes have proven refractory to oral hydroxychloroquine and ultraviolet A1 phototherapy. Several aspects of this case including the patient's family history of Raynaud disease, her nodular sclerodermatous skin lesions, and the presence of U1RNP autoantibodies raised concern about her management with respect to future risk of developing systemic sclerosis.

Background: Merkel cell carcinoma (MCC) is a highly aggressive neuroendocrine carcinoma of the skin caused by either the integration of Merkel cell polyomavirus (MCPyV) and expression of viral T antigens or by ultraviolet-induced damage to the tumor genome from excessive sunlight exposure. An increasing number of deep sequencing studies of MCC have identified significant differences between the number and types of point mutations, copy number alterations, and structural variants between virus-positive and virus-negative tumors. However, it has been challenging to reliably distinguish between virus positive and UV damaged MCC., Methods: In this study, we assembled a cohort of 71 MCC patients and performed deep sequencing with OncoPanel, a clinically implemented, next-generation sequencing assay targeting over 400 cancer-associated genes. To improve the accuracy and sensitivity for virus detection compared to traditional PCR and IHC methods, we developed a hybrid capture baitset against the entire MCPyV genome and software to detect integration sites and structure., Results: Sequencing from this approach revealed distinct integration junctions in the tumor genome and generated assemblies that strongly support a model of microhomology-initiated hybrid, virus-host, circular DNA intermediate that promotes focal amplification of host and viral DNA. Using the clear delineation between virus-positive and virus-negative tumors from this method, we identified recurrent somatic alterations common across MCC and alterations specific to each class of tumor, associated with differences in overall survival. Finally, comparing the molecular and clinical data from these patients revealed a surprising association of immunosuppression with virus-negative MCC and significantly shortened overall survival., Conclusions: These results demonstrate the value of high-confidence virus detection for identifying molecular mechanisms of UV and viral oncogenesis in MCC. Furthermore, integrating these data with clinical data revealed features that could impact patient outcome and improve our understanding of MCC risk factors.

Rearrangements involving the neurotrophic receptor kinase genes (NTRK1, NTRK2, and NTRK3; hereafter referred to as TRK) produce oncogenic fusions in a wide variety of cancers in adults and children. Although TRK fusions occur in fewer than 1% of all solid tumors, inhibition of TRK results in profound therapeutic responses, resulting in Breakthrough Therapy FDA approval of the TRK inhibitor larotrectinib for adult and pediatric patients with solid tumors, regardless of histology. In contrast to solid tumors, the frequency of TRK fusions and the clinical effects of targeting TRK in hematologic malignancies are unknown. Here, through an evaluation for TRK fusions across more than 7,000 patients with hematologic malignancies, we identified TRK fusions in acute lymphoblastic leukemia (ALL), acute myeloid leukemia (AML), histiocytosis, multiple myeloma, and dendritic cell neoplasms. Although TRK fusions occurred in only 0.1% of patients (8 of 7,311 patients), they conferred responsiveness to TRK inhibition in vitro and in vivo in a patient-derived xenograft and a corresponding AML patient with ETV6-NTRK2 fusion. These data identify that despite their individual rarity, collectively, TRK fusions are present in a wide variety of hematologic malignancies and predict clinically significant therapeutic responses to TRK inhibition.

Merkel cell polyomavirus is the primary etiological agent of the aggressive skin cancer Merkel cell carcinoma (MCC). Recent studies have revealed that UV radiation is the primary mechanism for somatic mutagenesis in nonviral forms of MCC. Here, we analyze the whole transcriptomes and genomes of primary MCC tumors. Our study reveals that virus-associated tumors have minimally altered genomes compared to non-virus-associated tumors, which are dominated by UV-mediated mutations. Although virus-associated tumors contain relatively small mutation burdens, they exhibit a distinct mutation signature with observable transcriptionally biased kataegic events. In addition, viral integration sites overlap focal genome amplifications in virus-associated tumors, suggesting a potential mechanism for these events. Collectively, our studies indicate that Merkel cell polyomavirus is capable of hijacking cellular processes and driving tumorigenesis to the same severity as tens of thousands of somatic genome alterations., Importance: A variety of mutagenic processes that shape the evolution of tumors are critical determinants of disease outcome. Here, we sequenced the entire genome of virus-positive and virus-negative primary Merkel cell carcinomas (MCCs), revealing distinct mutation spectra and corresponding expression profiles. Our studies highlight the strong effect that Merkel cell polyomavirus has on the divergent development of viral MCC compared to the somatic alterations that typically drive nonviral tumorigenesis. A more comprehensive understanding of the distinct mutagenic processes operative in viral and nonviral MCCs has implications for the effective treatment of these tumors., (Copyright © 2017 Starrett et al.)

Malawi polyomavirus (MWPyV) is a recently identified human polyomavirus. Serology for MWPyV VP1 indicates that infection frequently occurs in childhood and reaches a prevalence of 75% in adults. The MWPyV small T antigen (ST) binds protein phosphatase 2A (PP2A), and the large T antigen (LT) binds pRb, p107, p130, and p53. However, the MWPyV LT was less stable than the simian virus 40 (SV40) LT and was unable to promote the growth of normal cells. This report confirms that MWPyV is a widespread human virus expressing T antigens with low transforming potential., (Copyright © 2015, American Society for Microbiology. All Rights Reserved.)