The uterorelaxant effect of human chorionic gonadotropin (hCG) is regarded as an important mediator in maintenance of uterine quiescence during pregnancy with clinical potential for tocolysis, the mechanisms of which are unknown. The large conductance calcium-activated K(+) channel (BK(Ca)) is ubiquitously encountered in human uterine tissue and plays a significant role in modulating myometrial...

Single particle tracking was used to evaluate lateral motions of individual FLAGtagged human luteinizing hormone (LH) receptors expressed on Chinese hamster ovary (CHO) cells and native LH receptors on both KGN human granulosa-derived tumor cells and M17 human neuroblastoma cells before and after exposure to human chorionic gonadotropin (hCG). Compared to LH receptors on untreated cells, LH rec...

The objective of this study was to evaluate the distribution of choriocarcinoma-like human chorionic gonadotrophin (HCG) isoforms during first trimester pregnancy and their relationship with in-vitro HCG bioactivity. This was done by means of a retrospective analysis of patients' sera with first trimester normal intrauterine and abnormal (ectopic) pregnancies. Serum samples were obtained from 3...

STUDY QUESTION What is the in situ localization and function of hyperglycosylated hCG (hCG-H) in first trimester pregnancy tissues? SUMMARY ANSWER HCG-H localizes to the syncytiotrophoblast, cytotrophoblast and invasive extravillous trophoblast within the maternal decidua and promotes invasion during the first trimester of pregnancy. WHAT IS KNOWN ALREADY Serum levels of hCG-H decline drama...

Intact human chorionic gonadotropin (hCG), hyperglycosylated hCG, and the free subunit are the forms of hCG produced by healthy tissues and tumors (1 ). Intact hCG is the predominant form in serum and plasma in pregnancy and trophoblastic disease, hyperglycosylated hCG in choriocarcinoma and testicular cancer, and the free subunit in nongestational malignancy. Proteases present in macrophages a...

The concept of using thyroid-stimulating hormone (TSH) receptor antagonists in the management of Graves' disease is intriguing. Therefore, we investigated a TSH receptor antagonist derived from human chorionic gonadotropin (hCG) with respect to TSH receptor binding, adenylate cyclase activity, thyroid hormone release, and HLA class II antigen expression in vitro and in an in vivo model. A varia...

OBJECTIVES To make a histological and stereological analysis of gubernaculum testis elastic system fibers, collagen and striated muscle cells in patients with cryptorchidism treated with human chorionic gonadotrophin (hCG). MATERIALS AND METHODS Gubernacula tissue samples were obtained from 12 patients with cryptorchidism. Patients' ages ranged from 1 to 3 years (mean 1.8). Of the 12 patients...

BACKGROUND Germ cell testicular tumors have survival rate that diminishes with high tumor marker levels, such as human chorionic gonadotropin (hCG). hCG may regulate vascular neoformation through vascular endothelial growth factor (VEGF). Our purpose was to determine the relationship between hCG serum levels, angiogenesis, and VEGF expression in germ cell testicular tumors. METHODS We conduct...

BACKGROUND Solitary fibrous tumors are rare tumors of mesenchymal origins, most commonly seen arising from the pleural lining of the lungs. These are generally benign tumors, which in rare cases have been identified to be associated with multiple para-neoplastic syndromes. CASE REPORT This is a case of a solitary fibrous tumor of the pleura in a 49 year old female which was found to be associ...