Leydig Primary Cells
Overview
Leydig Primary Cells are isolated directly from testicular interstitial tissue without immortalization, preserving native physiological characteristics. These specialized endocrine cells were first identified by Franz Leydig in 1850 and play a pivotal role in male reproductive biology. As the primary source of testosterone in males, these cells contain abundant smooth endoplasmic reticulum and mitochondria with steroidogenic enzymes. Researchers value primary cells over cell lines for maintaining authentic hormone response patterns and genetic stability closer to in vivo conditions.
Key Features
Authentic Leydig cells exhibit luteinizing hormone (LH) receptor responsiveness and steroidogenic acute regulatory (StAR) protein activity. Their testosterone production capacity typically ranges 10-100 ng/106 cells/24h under optimal culture conditions. Quality indicators include positive immunostaining for 3β-hydroxysteroid dehydrogenase (3β-HSD) and cytochrome P450scc. Primary cells maintain better phenotypic stability than immortalized lines but have limited replicative capacity, usually lasting 3-5 passages before dedifferentiation.
Application Areas
These cells are indispensable for studying male hypogonadism, androgen biosynthesis pathways, and endocrine-disrupting chemical evaluation. Pharmaceutical companies utilize them in preclinical testing of testosterone replacement therapies and male contraceptive development. In toxicology, they serve as sensitive indicators for environmental androgen disruptors. Emerging applications include tissue engineering for testicular regeneration and studying age-related testosterone decline mechanisms.
Precautions
Primary Leydig cells require DMEM/F12 medium supplemented with 1-2% ITS (insulin-transferrin-selenium) and low-serum conditions (1-5% FBS). Cryopreserved batches should demonstrate ≥70% post-thaw viability for reliable experiments. Ethical procurement requires documentation of donor consent and tissue source verification. Biosafety Level 2 containment is recommended when handling human-derived cells due to potential bloodborne pathogen risks.
B2B Procurement Guide
Reputable suppliers provide certificates of analysis including viability, purity (typically ≥85% by immunocytochemistry), and functional testosterone output data. Rodent-derived cells are more cost-effective for screening, while human primary cells command premium pricing. Bulk purchasers should negotiate volume discounts for cryopreserved vials and confirm batch-to-batch consistency guarantees. Some vendors offer customized isolation from specific donor ages or health conditions for targeted research needs.
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