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#primary cells

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Animal Tissue Culture 1

Primary cell culture is defined as:

Primary cell culture approach involves direct isolation from intact adult or fetal tissue within hours after sacrifice maintaining in vivo characteristics including diploid karyotype forty six chromosomes for human cells, tissue-specific enzyme expression such as cytochrome P450 3A4 in hepatocytes, albumin secretion, surfactant production in alveolar type II cells, and physiological hormone responsiveness via appropriate receptors, features progressively lost upon immortalization transformation. Protocol begins sterile dissection under laminar flow hood, mincing organ into one millimeter cubes mechanically using scalpels, washing in Hank's balanced salt solution containing penicillin streptomycin amphotericin to reduce bacterial fungal load, enzymatic dispersal using collagenase type I or IV metalloprotease hydrolyzing Pro-Hyp-Gly repeats collagen triple helix requiring calcium cofactor, plus hyaluronidase degrading high molecular weight hyaluronic acid glycosaminoglycan improving tissue penetration, plus DNase I digesting released genomic DNA that otherwise increases viscosity causing clumping. Time controlled thirty to ninety minutes at thirty seven degrees with agitation, reaction quenched with fetal bovine serum containing protease inhibitors alpha-two macroglobulin.

Ref: Freshney Primary culture Hayflick limit contact inhibition Hippo YAP; Alberts MBoC diploid tissue explant collagenase dispersal.

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Basic Applied Biology

Primary cell culture is defined as:

Primary cell culture defines culture establishment directly from living tissue obtained via biopsy, surgical resection, embryonic dissection or enzymatic disaggregation without prior in vitro passage or immortalization step, preserving in vivo characteristics. Tissue fragments minced to one cubic millimeter pieces, digested with collagenase type I, trypsin-EDTA, dispase or liberase cocktails to release single cells, filtered to remove debris and seeded into tissue culture flasks containing medium supplemented with serum providing growth factors, antibiotics preventing contamination and attachment factors like fibronectin. Such cultures retain diploid karyotype, tissue-specific markers such as albumin secretion by hepatocytes, surfactant production by alveolar type II cells or contractility by cardiomyocytes, limited proliferative capacity subject to Hayflick limit of 50 to 60 divisions, contact inhibition mediated by Hippo YAP signaling and senescence markers SA-beta-galactosidase. Heterogeneity reflects original organ containing fibroblasts, epithelial and endothelial populations requiring purification by differential adhesion or magnetic sorting. Unlike continuous lines transformed by SV40 large T antigen, telomerase hTERT activation or spontaneous mutation leading to aneuploidy and infinite growth, primary cells closely mimic physiology for drug toxicity testing, virology and regenerative medicine, demanding careful handling and short-term use.

Ref: Freshney Culture of Animal Cells 7th ed. Ch 11 Primary culture; Alberts Molecular Biology of Cell Ch cell culture methods.

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