Anti-LY6K monoclonal antibody, clone C44gd9l [PE]

Purposes: To investigate the effect of proliferation, migration and invasion after knockdown LY6K in cervical cancer HeLa cells, and then clarify the potential mechanism. Methods: The expression of LY6K in cervical cancer tissues was determined by S-P immunohistochemistry. The proliferation, migration and invasion ability were detected after silencing LY6K in cervical cancer HeLa cell lines. The expression of VEGFA, miR-15a and miR-24 was detected after knockdown LY6K in cervical cancer HeLa cells. The expression of LY6K and VEGFA was detected when transfected miR-15a mimics and miR-24 mimics. Then we determined the tumorigenicity of cervical cancer HeLa cells after knockdown LY6K. Results: The expression of LY6K was higher in cervical cancer tissues than normal cervical tissues (P<0.05). The proliferation, migration and invasion ability were decreased after silencing LY6K in cervical cancer HeLa cells (P<0.05). The expression of VEGFA was decreased after knockdown LY6K; however, the expression of miR-15a and miR-24 was increased after knockdown LY6K (P<0.05). The expression of LY6K was decreased after knockdown VEGFA; however, the expression of miR-15a and miR-24 was increased after knockdown VEGFA (P<0.05). The expression of LY6K and VEGFA was inhibited when transfected miR-15a and miR-24; however, the expression of LY6K and VEGFA was increased when transfected miR-15a and miR-24 inhibitors (P<0.05). Silencing LY6K prevented cervical cancer growth in vivo. Conclusion: Silencing LY6K can inhibited proliferation, migration and invasion ability in cervical HeLa cells by regulation VEGFA.

TEX101 is a germ-cell-specific protein and a validated biomarker of male infertility. Mouse TEX101 was found essential for male fertility and was suggested to function as a cell surface chaperone involved in maturation of proteins required for sperm migration and sperm-oocyte interaction. However, the precise functional role of human TEX101 is not known and cannot be studied in vitro due to the lack of human germ cell lines. Here, we genotyped 386 men for a common missense variant rs35033974 of TEX101 and identified 52 heterozygous and 4 homozygous men. We then discovered by targeted proteomics that the variant allele rs35033974 was associated with the near-complete degradation (>97%) of the corresponding G99V TEX101 form and suggested that spermatozoa of homozygous men could serve as a knockdown model to study TEX101 function in humans. Differential proteomic profiling with label-free quantification measured 8,046 proteins in spermatozoa of eight men and identified eight cell-surface and nine secreted testis-specific proteins significantly down-regulated in four patients homozygous for rs35033974. Substantially reduced levels of testis-specific cell-surface proteins potentially involved in sperm migration and sperm-oocyte interaction (including LY6K and ADAM29) were confirmed by targeted proteomics and Western blotting assays. Because recent population-scale genomic data revealed homozygous fathers with biological children, rs35033974 is not a monogenic factor of male infertility in humans. However, median TEX101 levels in seminal plasma were found fivefold lower (p = 0.0005) in heterozygous than in wild-type men of European ancestry. We conclude that spermatozoa of rs35033974 homozygous men have substantially reduced levels of TEX101 and could be used as a model to elucidate the precise TEX101 function, which will advance biology of human reproduction.