Accumulation of polyadenylated mRNA during liver regeneration.
Cytoplasmic and polysomal polyadenylated mRNA [poly(A)+-mRNA] increased by 120% prior to the onset of DNA synthesis during the regeneration of rat liver following partial hepatectomy. Despite this large change in cytoplasmic mRNA and an approximately 50% increase in total nuclear RNA, the amount of polyadenylated nuclear RNA increased by only 15--20% during this time. Neither the average size of nuclear or of cytoplasmic polyadenylated mRNA nor the length of their poly(adenylic acid) [poly(A)] tracts changed during liver regeneration. Polysomal poly-(A)+-mRNA increased proportionately more and at a faster rate than rRNA during the first day following partial hepatectomy. Normal livers contained a substantial proportion of cytoplasmic poly(A)+-mRNA not associated with polysomes but this proportion was not altered in 3-h regenerating liver. Thus, in regenerating liver, most preexisting cytoplasmic mRNA does not appear to be recruited into polysomes prior to the substantial increase in the amount of cytoplasmic poly(A)+-mRNA.
D000818:Animals; D002467:Cell Nucleus / Q000378:metabolism; D007700:Kinetics; D008099:Liver / Q000378:metabolism*; D008115:Liver Regeneration; D008297:Male; D008970:Molecular Weight; D011061:Poly A / Q000096:biosynthesis*; D011132:Polyribosomes / Q000378:metabolism; D012333:RNA, Messenger / Q000096:biosynthesis*; D051381:Rats
D012333:RNA, Messenger; D011061:Poly A