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. 1981 Jan;1(1):66–74. doi: 10.1128/mcb.1.1.66

Markedly elevated levels of an endogenous sarc protein in a hemopoietic precursor cell line.

E M Scolnick 1, M O Weeks 1, T Y Shih 1, S K Ruscetti 1, T M Dexter 1
PMCID: PMC369328  PMID: 6821513

Abstract

The src gene product of Harvey murine sarcoma virus is a 21,000-dalton guanine nucleotide-binding protein. We have recently shown that a wide variety of vertebrate cell strains and cell lines express much lower levels of an endogenous p21 immunologically related to the Harvey murine sarcoma virus-coded p21. In this report, we have examined the levels of endogenous p21 in a unique hemopoietic precursor cell line, 416B, which was originally described as a continuous cell line of a hemopoietic stem cell, CFU-S. The currently available 416B cells express markedly elevated levels of endogenous p21. The level of endogenous p21 in the 416B cells is 5- to 10-fold higher than the level of p21 in Harvey murine sarcoma virus-infected cells and more than 100 times higher than the level of endogenous p21 that we have observed in a variety of other fresh or cultured cells. The results indicate that marked regulation of the levels of an endogenous sarc gene product can occur, and speculation about a possible role for endogenous p21 in normal hemopoietic stem cells is discussed.

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