## Abstract Gene amplification contributes to carcinogenesis by enhancing protoโoncogene activity and causing chromosomal instability. The ease of detecting amplified tumorโvirus sequences has encouraged use of this system as a surrogate for studying the molecular events involved in endogenous gene
Patterns of cell communication and differentiation in SV40 transformed human keratinocytes
โ Scribed by Mark Steinberg; Vittorio Defendi
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 778 KB
- Volume
- 109
- Category
- Article
- ISSN
- 0021-9541
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โฆ Synopsis
Abstract
Fluorescein dye microinjection was used to demonstrate changes in communication between human epidermal keratinocytes grown in vitro after infection by the oncogenic virus, SV40. Whereas keratinocytes are normally fully coupled to each other, dye spread becomes progressively restricted to small cell subpopulations after infection, although dye coupling is increased when the infected cells attain high densities. Reduction or enhancement of dye coupling is correlated with similar changes in the extent of cytochemical differentiation and cornified envelope formation.
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Nineteen cultures of human embryonic or adult-tissue cells were exposed to sv40 as primary cultures or developed cell strains in Phase I1 of cultural life; 12 cultures were exposed to virus in Phase 111, at the end of in vitl-o life. After the expected proliferative response, infected cultures exhib
## Abstract The mechanism of glucose entry into human vascular endothelial cells was studied in monolayer cultures of normal (primary) and virally (SV40) transformed umbilical vein endothelium. Radioisotopic uptake studies with the glucose analogues 2โdeoxyโDโglucose, and 3โOโmethylโDโglucose, and
We analyzed the state of the genomic DNA of the papovavirus SV40 in human keratinocytes as viral-infected cells gradually acquired a transformed phenotype over time. Initially, the vast majority of the viral DNA is maintained either in a full-length supercoiled form or as truncated subgenomic fragme
## Abstract Early studies on the duration of mitotic stages and on metaphaseโtoโprophase ratios in a number of normal and neoplastic cells indicated that the process of mitosis becomes altered during the course of oncogenesis. However, the nature of these changes and their effects on each of the mi