Transcriptional regulation of hexokinase II in denervated rat skeletal muscle

Hexokinase II protein is augmented in denervated skeletal muscle; therefore, we determined if hexokinase II gene transcription rates and mRNA levels are increased with denervation. The right hindlimb skeletal muscles of male rats were denervated while the left hindlimbs were sham operated, Seventy-two h following surgery, rats were sacrificed and the gastrocnemius and soleus muscles were harvested for nuclear and RNA isolation, Nuclear run-on and ribonuclease protection analyses indicated th:lt denervation increased hexokinase II transcription rates and mRNA levels 42% and 88%, respectively (p<0.05). Total hexokinase activity rose 23% in denervated gastrocnemius muscle, In conclusion, the increase in hexokinase II gene transcription and mRNA may account for the increase in hexokinase II protein and the subsequent rise in total hexokinase activity in denervated rat skeletal muscle. (C) 1997 Academic Press.