Premium
Mitogenic signal transduction in normal and transformed 32D hematopoietic cells
Author(s) -
Ruggiero Marco,
Wang Ling M.,
Pierce Jacalyn H.
Publication year - 1991
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(91)81284-f
Subject(s) - diacylglycerol kinase , growth factor , second messenger system , protein kinase c , epidermal growth factor , biology , platelet derived growth factor receptor , signal transduction , inositol , gq alpha subunit , platelet derived growth factor , microbiology and biotechnology , diglyceride , phosphoinositide phospholipase c , phosphatidylinositol , medicine , receptor , g protein , biochemistry , enzyme
We studied mitogenic signal transduction in normal and oncogene‐transformed 32D cells, a murine hematopoietic cell line that is normally dependent on interleukin‐3 (IL3) for proliferation and survival. The formation of second messengers was measured in normal cells stimulated with IL3, and in cells transfected with foreign growth factor receptor genes and stimulated with appropriate growth factors. We also measured the steady‐state level of second messengers in 32D cells transformed by erb B, abl , and src oncogenes which abrogate growth factor requirement. We found that IL3 stimulated the formation of diacylglycerol independently of inositol lipid turnover, but concomitantly with increased turnover of phosphatidylcholine. Epidermal growth factor (EGF), and platelet‐derived growth factor (PDGF) stimulated the ‘classical’ turnover of inositol lipids with formation of diacylglycerol and calcium‐mobilizing inositol phosphates. Colony stimulating factor‐1 trigged inositol lipid turnover, although to a much lower extent than EGF and PDGF. Transformed cells showed elevated levels of diacylglycerol together with increased turnover of phosphoinositides and phosphatidylcholine. Taken together these results indicate that different growth factors and oncoproteins associate with multiple signalling pathways in 32D cells.