HCG Research Guide: Gonadotropin Biology and Endocrine Studies

<p>Human chorionic gonadotropin (HCG) is a glycoprotein hormone produced during pregnancy and by certain tumor types. Structurally related to LH (luteinizing hormone), FSH, and TSH — all members of the glycoprotein hormone family sharing a common alpha subunit — HCG acts primarily at the LH/CG receptor (LHCGR) and has been studied in reproductive endocrinology, oncology, and basic endocrine research for decades.</p><h2>Molecular Profile</h2><p>HCG is a heterodimeric glycoprotein: alpha subunit (92 amino acids, shared with LH/FSH/TSH) + beta subunit (145 amino acids, HCG-specific). MW: ~36,700 Da | CAS: 9002-61-3</p><h2>LH/CG Receptor Mechanism</h2><p>HCG and LH share the same receptor (LHCGR), a leucine-rich repeat GPCR expressed in gonadal tissue (Leydig cells in testes, theca and granulosa cells in ovaries), and also in multiple extragonadal sites. LHCGR activation stimulates cAMP production, activating PKA-dependent signaling cascades that regulate steroidogenesis.</p><h2>Research Applications</h2><ul><li>LH receptor pharmacology and signaling studies</li><li>Steroidogenesis pathway research in gonadal cell models</li><li>HPG axis integration research</li><li>Oncology research — HCG as tumor marker biology</li><li>Placental biology and trophoblast cell research</li><li>Comparative LH vs. HCG receptor kinetics studies</li></ul><p>Q: Why is HCG studied as an LH analog?</p><p>A: HCG shares the same receptor as LH (LHCGR) and produces similar biological effects but with a substantially longer half-life (~24h vs ~1h for LH). This makes it useful for studying prolonged LH receptor activation in research models.</p><p>Q: Is HCG used in research outside reproductive biology?</p><p>A: Yes. HCG is also studied in oncology contexts as a tumor marker (elevated in choriocarcinoma, testicular cancer) and in basic endocrine pathway research.</p><p>Related: HCG Product → | Kisspeptin Research Guide → | PT-141 Research Guide → | Hormonal Research Products →</p>