Human Chorionic Gonadotropin (hCG) Lyophilized Reagent⁠

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Human Chorionic Gonadotropin (hCG) | Heterodimeric Glycoprotein Reagent

Human Chorionic Gonadotropin (hCG) is a complex, high-molecular-weight dimeric glycoprotein hormone[span_0](end_span). [span_1](start_span)It consists of two non-covalently bound subunits: a highly conserved 92-amino acid alpha ($\alpha$) subunit (shared structurally with LH, FSH, and TSH) and a unique 145-amino acid beta ($\beta$) subunit that dictates its high biological specificity[span_1](end_span).
[span_2](start_span)

In cell culture and preclinical evaluation models, hCG acts as a potent and sustained agonist for the target Luteinizing Hormone / Choriogonadotropin Receptor (LHCGR)[span_2](end_span). [span_3](start_span)Due to its extended carboxy-terminal peptide sequence on the $\beta$-subunit, hCG provides a significantly longer biological half-life and greater overall receptor-binding stability than standard luteinizing hormone[span_3](end_span), making it a foundational reference agent for analyzing prolonged cellular feedback loops along the hypothalamic-pituitary-gonadal (HPG) axis.

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Experimental Vectors & Research Applications

Utilizing the 5000 IU or 10000 IU configurations within standardized in vitro layouts allows investigators to explore key laboratory objectives:

• Steroidogenesis Modeling: Simulating the cellular upregulation signals that govern the enzymatic conversion of cholesterol into primary sex steroids (such as testosterone and progesterone) within isolated Leydig or corpus luteum cell cultures[span_4](end_span).
• Adenylate Cyclase Activation: Measuring intracellular cyclic AMP (cAMP) accumulation and downstream protein kinase cascades triggered by localized receptor saturation.[span_5](start_span)
• Cellular Differentiation Trials: Evaluating the precise structural parameters needed to promote follicular maturation or cellular proliferation within specialized mammalian tissue models[span_5](end_span).

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Laboratory Reconstitution & Storage Standards

Because glycoproteins contain intricate tertiary structures vulnerable to physical and thermal degradation, strict handling criteria must be preserved:

• Long-Term Stability: Keep sealed, dry lyophilized vials inside a laboratory freezer regulated strictly at -20°C to protect against structural denaturation.
• Fluid Introduction: Reconstitute gently using Sterile Bacteriostatic Water or normal saline. Slowly run the liquid down the interior glass wall. Do not shake or vortex the vial; gently swirl to avoid high shear-stress foaming.
• Liquid Storage: Post-reconstitution, maintain the liquid medium inside a refrigeration unit at 2°C to 8°C. It is recommended to exhaust the fluid within 14 days of mixing to preserve optimal enzymatic reactivity profiles.