hCG: Biological Functions and Clinical Applications

Area of Science:

• Reproductive biology and endocrinology.
• Molecular signaling and cell biology.
• Maternal-fetal medicine and immunology.

Background:

• Human chorionic gonadotropin (hCG) is a key embryonic signal crucial for maintaining pregnancy.
• Produced by syncytiotrophoblasts, hCG interacts with receptors like LHCGR and TGFβR.
• It belongs to the glycoprotein hormone family, sharing subunits with LH, TSH, and FSH.

Purpose of the Study:

• To provide a comprehensive review of human chorionic gonadotropin (hCG).
• To examine the diverse biological functions and signaling pathways of hCG.
• To explore the extensive clinical applications of hCG in pregnancy and beyond.

Main Methods:

• Literature review of scientific articles on hCG.
• Analysis of hCG's molecular structure and homology with related hormones.
• Examination of signaling cascades activated by hCG binding.

Main Results:

• hCG activates signaling pathways such as Smad2, PKC, and PKA.
• It plays critical roles in angiogenesis, myometrial quiescence, and immunomodulation.
• hCG exhibits diverse forms and is produced by multiple organs.

Conclusions:

• hCG is essential for pregnancy maintenance through multiple biological actions.
• Its varied forms and signaling mechanisms underscore its complex roles.
• hCG has significant clinical utility in diagnostics, monitoring, and cancer surveillance.