Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1995-5-3
pubmed:abstractText
Although renal hypertrophy is often associated with the progressive loss of renal function, the mechanism of hypertrophy is poorly understood. In both primary cultures of rabbit proximal tubules and NRK-52E cells (a renal epithelial cell line), transforming growth factor beta 1 (TGF beta) converted epidermal growth factor (EGF)-induced hyperplasia into hypertrophy. TGF beta did not affect EGF-induced increases in c-fos mRNA abundance or cyclin E protein abundance, but inhibited EGF-induced entry into S, G2, and M phases. EGF alone increased the amount of hyperphosphorylated (inactive) pRB; TGF beta blocked EGF-induced pRB phosphorylation, maintaining pRB in the active form. To determine the importance of active pRB in TGF beta-induced hypertrophy, NRK-52E cells were infected with SV40 large T antigen (which inactivates pRB and related proteins and p53), HPV16 E6 (which degrades p53), HPV16 E7 (which binds and inactivates pRB and related proteins), or both HPV16 E6 and E7. In SV40 large T antigen expressing clones, the magnitude of EGF + TGF beta-induced hypertrophy was inhibited and was inversely related to the magnitude of SV40 large T antigen expression. In the HPV16-infected cells, EGF + TGF beta-induced hypertrophy was inhibited in E7- and E6E7-expressing, but not E6-expressing cells. These results suggest a requirement for active pRB in the development of EGF + TGF beta-induced renal epithelial cell hypertrophy. We suggest a model of renal cell hypertrophy mediated by EGF-induced entry into the cell cycle with TGF beta-induced blockade at G1/S, the latter due to maintained activity of pRB or a related protein.
pubmed:grant
pubmed:commentsCorrections
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pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/Antigens, Polyomavirus Transforming, http://linkedlifedata.com/resource/pubmed/chemical/E6 protein, Human papillomavirus..., http://linkedlifedata.com/resource/pubmed/chemical/Epidermal Growth Factor, http://linkedlifedata.com/resource/pubmed/chemical/Oncogene Proteins, Viral, http://linkedlifedata.com/resource/pubmed/chemical/Papillomavirus E7 Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Proto-Oncogene Proteins c-fos, http://linkedlifedata.com/resource/pubmed/chemical/RNA, Messenger, http://linkedlifedata.com/resource/pubmed/chemical/Recombinant Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Repressor Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Retinoblastoma Protein, http://linkedlifedata.com/resource/pubmed/chemical/Transforming Growth Factor beta, http://linkedlifedata.com/resource/pubmed/chemical/Tumor Suppressor Protein p53, http://linkedlifedata.com/resource/pubmed/chemical/oncogene protein E7, Human...
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0021-9525
pubmed:author
pubmed:issnType
Print
pubmed:volume
129
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
245-54
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
More...