Does proteasome regulate the level of microRNA-1 in cardiomyocytes? Application to anoxia-reoxygenation.
Proteasome and microRNAs play a critical role in almost all processes in a living organism, including pathology of the heart; however, their interaction is still in question. In the present study, we have found that proteasome inhibitor provoked increase of mature but not immature microRNA-1 in cultured cardiomyocytes, and tested the hypothesis that mature microRNA-1 can be a substrate for endonuclease activity of proteasome. In our in vitro experiments, we have found that proteasome fraction II is able to degrade both mature and primary but not precursor microRNA-1. However, this in vitro effect was not abolished by chemical inhibitor of proteolytic activities of proteasome. These data let us summarize that proteasome has the complex effect on the level of microRNA-1.
Bogomoletz Institute of Physiology, National Academy of Science, Kiev, Ukraine.
Veronika
V
Gurianova
Dmytro
D
Stroy
Peter
P
Kruzliak
Victoria
V
Kyrichenko
Alex
A
Moibenko
Victor
V
Dosenko
D000818:Animals; D017209:Apoptosis / Q000235:genetics; D015687:Cell Hypoxia / Q000235:genetics; D003593:Cytoplasm / Q000235:genetics / Q000378:metabolism; D004720:Endonucleases / Q000378:metabolism; D000860:Hypoxia / Q000235:genetics; D035683:MicroRNAs / Q000235:genetics* / Q000378:metabolism; D032383:Myocytes, Cardiac / Q000201:enzymology / Q000378:metabolism*; D046988:Proteasome Endopeptidase Complex / Q000378:metabolism*; D051381:Rats
C542191:MIRN1 microRNA, rat; D035683:MicroRNAs; D004720:Endonucleases; D046988:Proteasome Endopeptidase Complex