Human Chorionic Gonadotropin and Early Embryogenesis: Review.

Area of Science:

• Reproductive Endocrinology
• Embryology
• Biochemistry

Background:

• Human chorionic gonadotropin (hCG) is a vital hormone produced by the early embryo.
• Four major isoforms of hCG exist: classical hCG, hyperglycosylated hCG, free β subunit, and sulphated hCG.
• Classical hCG synthesis begins at the eight-cell stage, preceding blastocyst implantation.

Purpose of the Study:

• To synthesize current knowledge on human chorionic gonadotropin (hCG).
• To explore the multifaceted roles of hCG in early pregnancy and maternal physiology.
• To consolidate information on hCG levels, angiogenic activity, immunological actions, and effects on miscarriage and thyroid function.

Main Methods:

• Literature review of scientific articles on human chorionic gonadotropin (hCG).
• Synthesis of existing data regarding hCG isoforms and their functions.
• Compilation of information on hCG's physiological and pathological impacts.

Main Results:

• Classical hCG is the first molecule synthesized by the embryo, with RNA transcribed at the eight-cell stage.
• The blastocyst produces hCG protein prior to implantation.
• hCG exhibits significant angiogenetic activity, immunological actions, and influences miscarriage and thyroid function.

Conclusions:

• Human chorionic gonadotropin (hCG) is a critical early embryonic factor with diverse physiological roles.
• Understanding hCG's functions is essential for reproductive health and pregnancy management.
• Further research into hCG's complex interactions can elucidate its impact on pregnancy outcomes and maternal health.