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Regulation of AMP-a...
Regulation of AMP-activated protein kinase by LKB1 and CaMKK in adipocytes.
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- Gormand, Amelie (author)
- Lund University,Lunds universitet,Molekylär endokrinologi,Forskargrupper vid Lunds universitet,Molecular Endocrinology,Lund University Research Groups
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- Henriksson, Emma (author)
- Lund University,Lunds universitet,Proteinfosforylering,Forskargrupper vid Lunds universitet,Protein Phosphorylation,Lund University Research Groups
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- Ström, Kristoffer (author)
- Lund University,Lunds universitet,Molekylär endokrinologi,Forskargrupper vid Lunds universitet,Molecular Endocrinology,Lund University Research Groups
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Jensen, Thomas Elbenhardt (author)
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Sakamoto, Kei (author)
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- Göransson, Olga (author)
- Lund University,Lunds universitet,Proteinfosforylering,Forskargrupper vid Lunds universitet,Signaltransduktionsforskning,Protein Phosphorylation,Lund University Research Groups,Insulin Signal Transduction
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(creator_code:org_t)
- 2011-04-01
- 2011
- English.
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In: Journal of Cellular Biochemistry. - : Wiley. - 0730-2312. ; 112, s. 1364-1375
- Related links:
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http://www.ncbi.nlm....
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
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- AMP-activated protein kinase (AMPK) is a serine/threonine kinase that regulates cellular and whole body energy homeostasis. In adipose tissue, activation of AMPK has been demonstrated in response to a variety of extracellular stimuli. However, the upstream kinase that activates AMPK in adipocytes remains elusive. Previous studies have identified LKB1 as a major AMPK kinase in muscle, liver and other tissues. In certain cell types, Ca(2+) /Calmodulin-dependent protein kinase kinase (CaMKK) β has been shown to activate AMPK in response to increase of intracellular Ca(2+) levels. Our aim was to investigate if LKB1 and/or CaMKK function as AMPK kinases in adipocytes. We used adipose tissue and isolated adipocytes from mice in which the expression of LKB1 was reduced to 10-20% of that of wild-type (LKB1 hypomorphic mice). We show that adipocytes from LKB1 hypomorphic mice display a 40% decrease in basal AMPK activity and a decrease of AMPK activity in the presence of the AMPK activator phenformin. We also demonstrate that stimulation of 3T3L1 adipocytes with intracellular [Ca(2+) ]-raising agents results in an activation of the AMPK pathway. The inhibition of CaMKK isoforms, particularly CaMKKβ, by the inhibitor STO-609 or by siRNAs, blocked Ca(2+) -, but not phenformin-, AICAR or forskolin-induced activation of AMPK, indicating that CaMKK activated AMPK in response to Ca(2+) . Collectively, we show that LKB1 is required to maintain normal AMPK-signalling in non-stimulated adipocytes and in the presence of phenformin. In addition, we demonstrate the existence of a Ca(2+) /CaMKK signalling pathway that can also regulate the activity of AMPK in adipocytes. J. Cell. Biochem. © 2011 Wiley-Liss, Inc.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Endokrinologi och diabetes (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Endocrinology and Diabetes (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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