TY - JOUR
T1 - Prostaglandin endoperoxide synthase (cyclooxygenase) mRNA and protein production in mouse myoblasts and a differentiation-defective variant
AU - Steiner, Sheldon M.
AU - Keutzer, Joan Cleves
AU - Hirschhorn, Ricky R.
N1 - Funding Information:
We appreciate the excellent technical assistance of Daryl Robertson. These studies were partially funded by NIH Biomedical Rem search Support Grant SO7 RR071 14 (S.M.S.) and Public Health Service Grant CA 43,798 from the National Institutes of Health (R.R.H.).
PY - 1991/2
Y1 - 1991/2
N2 - Northern blot analysis revealed that a differentiation-defective variant (DD-1) of MM14 mouse myoblasts has seven times the prostaglandin endoperoxide synthase mRNA than the parental MM14 myoblasts. There was an even greater increase in the level of prostaglandin endoperoxide synthase protein in the DD-1 cells as compared to that in the MM14 myoblasts. In fact, prostaglandin endoperoxide synthase was not detectable by Western blot analysis of extracts from MM14 myoblasts. Since prostaglandin endoperoxide synthase has been reported to be a gene whose expression is induced transiently, i.e., growth-regulated, upon mitogen stimulation of quiescent cells, the RNA abundance of other growth-regulated genes was examined including: KC, JE, c-myc, 1B6, and vimentin. Northern blot analysis revealed that the mRNA abundance of JE, KC, and c-myc is 12-, 17-, and 2-fold higher, respectively, in growing DD-1 cells than in growing MM14 myoblasts. In contrast, there was little difference in the mRNA abundance of 1B6 and vimentin. These results are consistent with the hypothesis that increases in the levels of expression of prostaglandin endoperoxide synthase and some growth-regulated genes are integral to the expression of the differentiation-defective phenotype and may in fact contribute to this phenotype.
AB - Northern blot analysis revealed that a differentiation-defective variant (DD-1) of MM14 mouse myoblasts has seven times the prostaglandin endoperoxide synthase mRNA than the parental MM14 myoblasts. There was an even greater increase in the level of prostaglandin endoperoxide synthase protein in the DD-1 cells as compared to that in the MM14 myoblasts. In fact, prostaglandin endoperoxide synthase was not detectable by Western blot analysis of extracts from MM14 myoblasts. Since prostaglandin endoperoxide synthase has been reported to be a gene whose expression is induced transiently, i.e., growth-regulated, upon mitogen stimulation of quiescent cells, the RNA abundance of other growth-regulated genes was examined including: KC, JE, c-myc, 1B6, and vimentin. Northern blot analysis revealed that the mRNA abundance of JE, KC, and c-myc is 12-, 17-, and 2-fold higher, respectively, in growing DD-1 cells than in growing MM14 myoblasts. In contrast, there was little difference in the mRNA abundance of 1B6 and vimentin. These results are consistent with the hypothesis that increases in the levels of expression of prostaglandin endoperoxide synthase and some growth-regulated genes are integral to the expression of the differentiation-defective phenotype and may in fact contribute to this phenotype.
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U2 - 10.1016/0014-4827(91)90088-C
DO - 10.1016/0014-4827(91)90088-C
M3 - Article
C2 - 1671013
AN - SCOPUS:0025963548
SN - 0014-4827
VL - 192
SP - 643
EP - 646
JO - Experimental cell research
JF - Experimental cell research
IS - 2
ER -