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-subunit isoforms of AMP-activated protein kinase suggests a major role for
3 in white skeletal muscle
1Arexis AB, SE-413 46 Gothenburg; 2Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, and 4Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala Biomedical Center, SE-751 23 Uppsala; and 3Department of Surgical Sciences, Karolinska Institutet, SE-171 77 Stockholm, Sweden
Submitted 3 April 2003 ; accepted in final form 6 October 2003
Expression patterns of the three isoforms of the regulatory
-subunit of AMP-activated protein kinase (AMPK) were determined in various tissues from adult humans, mice, and rats, as well as in human primary muscle cells. Real-time PCR-based quantification of mRNA showed similar expression patterns in the three species and a good correlation with protein expression in mice and rats. The
3-isoform appeared highly specific to skeletal muscle, whereas
1 and
2 showed broad tissue distributions. Moreover, the proportion of white, type IIb fibers in the mouse and rat muscle samples, as indicated by real-time PCR quantification of Atp1b2 mRNA, showed a strong positive correlation with the expression of
3. In samples of white skeletal muscle,
3 clearly appeared to be the most abundant
-isoform. Differentiation of human primary muscle cells from myoblasts into multinucleated myotubes was accompanied by upregulation of
3 mRNA expression, whereas levels of
1 and
2 remained largely unchanged. However, even in these cultured myotubes,
2 was the most highly expressed isoform, indicating a considerable difference compared with adult skeletal muscle. Immunoblot analysis of mouse gastrocnemius and quadriceps muscle extracts precipitated with a
3-specific antibody showed that
3 was exclusively associated with the
2- and
2-subunit isoforms. The observation that the AMPK
3 isoform is expressed primarily in white skeletal muscle, in which it is the predominant
-isoform, strongly suggests that
3 has a key role in this tissue.
adenosine monophosphate; real-time polymerase chain reaction; antibodies; mouse; rat; human
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