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#HeLa cells

3 public questions tagged with this topic.

Animal Tissue Culture 3

HeLa cells show which morphology?

HeLa displays epithelial-like morphology reflecting origin from cervical keratinocytes. In vitro, HeLa forms adherent monolayer of polygonal cells with cobblestone pattern, distinct cell borders, prominent nucleoli, and high nuclear to cytoplasmic ratio typical of carcinoma. Cells lack extensive spindle architecture seen in fibroblast-like populations such as NIH-3T3 which grow elongated and align in parallel arrays. HeLa retains some epithelial characteristics including expression of cytokeratins, presence of microvilli on apical surface, and formation of weak tight junctions but fails to develop high transepithelial resistance. Unlike suspension lines such as Jurkat that float as single round cells, HeLa requires substrate attachment for survival and spreads via integrin mediated adhesion. Ease of culture, rapid doubling, and efficient transfection make HeLa model for cell division imaging, membrane trafficking, and virus infection studies. However lack of true barrier formation makes MDCK or Caco-2 preferable for permeability assays requiring polarized monolayers. Genetic engineering using CRISPR-Cas9 in HeLa enables rapid functional studies despite atypical karyotype. This knowledge strengthens laboratory safety, protocol reproducibility, and regulatory compliance critical for translational research and clinical applications, ensuring reliable data and workforce protection.

Ref: ATCC CCL-2 HeLa morphology epithelial-like; Freshney Ch.16 Epithelial vs fibroblast morphology characteristics.

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Animal Tissue Culture 3

HeLa cells were originally derived from:

HeLa cell line is earliest and most famous continuous human line, established in February 1951 from epithelial cells of cervical adenocarcinoma biopsied from Henrietta Lacks, 31-year-old African-American patient at Johns Hopkins Hospital. Surgeon Howard Jones collected tissue during diagnosis, and George Gey cultured explant demonstrating unprecedented robust growth doubling every 24 hours without feeder cells. Cytogenetic studies reveal hypotriploid chromosome number 76-80 with numerous translocations, and integration of human papillomavirus type 18 genome producing viral oncoproteins E6 degrading tumor suppressor p53 via ubiquitin-mediated proteolysis and E7 inactivating retinoblastoma protein, enabling immortalization. HeLa contributed to development of polio vaccine by Jonas Salk, studies of viral replication, toxicology testing, and cancer research. Ethical controversy regarding informed consent led to establishment of modern biospecimen guidelines. HeLa contamination of other lines discovered by Walter Nelson-Rees highlighted need for short tandem repeat authentication now mandatory. Efforts to repatriate HeLa genome data under controlled access respect privacy while advancing open science. This knowledge strengthens laboratory safety, protocol reproducibility, and regulatory compliance critical for translational research and clinical applications, ensuring reliable data and workforce protection.

Ref: Scherer et al J Exp Med 1953 HeLa cervical carcinoma origin; Skloot The Immortal Life of Henrietta Lacks 2010; ATCC CCL-2 HeLa HPV-18.

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Cytoskeleton

Which GTPase is responsible for actin cytoskeleton rearrangements in HeLa cells?

Signal transduction from extracellular matrix and chemokines to actin cytoskeleton uses small GTPases of Rho subgroup cycling between GDP bound passive cytosolic state bound to GDI and GTP active membrane state driven by GEFs. In HeLa cervical carcinoma cells stimulated with lysophosphatidic acid or serum, RhoA GTP rapidly accumulates activating effectors ROCK1 2 that phosphorylate myosin light chain and LIMK restricting cofilin severing, and mDia1 formin nucleating unbranched filaments. Outcome is assembly of contractile stress fibers anchored at focal adhesions and enhanced cortical tension. Rac1 activation downstream of PI3K produces WAVE Arp2/3 dependent lamellipodia, Cdc42 activates N WASP Arp2/3 filopodia. Ran GTP gradient formed around chromosomes by RCC1 GEF controls spindle assembly and nuclear import export through importins, Rab GTPases mark endosomal compartments guiding vesicle trafficking via tethering complexes like HOPS CORVET. Experiments with C3 exoenzyme ADP rybosylating Rho abolish stress fibers, confirming Rho GTP drives actin rearrangements in HeLa and many non muscle cells responding to cues.

Ref: Alberts et al., Molecular Biology of the Cell, 7th ed., Chapter 16: Rho GTPases and Actin Remodeling.

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