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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biomed+Sci
2017 ; 24
(1
): 70
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Role of mitochondrial dysfunction and dysregulation of Ca(2+) homeostasis in the
pathophysiology of insulin resistance and type 2 diabetes
#MMPMID28882140
Wang CH
; Wei YH
J Biomed Sci
2017[Sep]; 24
(1
): 70
PMID28882140
show ga
Metabolic diseases such as obesity, type 2 diabetes (T2D) and insulin resistance
have attracted great attention from biomedical researchers and clinicians because
of the astonishing increase in its prevalence. Decrease in the capacity of
oxidative metabolism and mitochondrial dysfunction are a major contributor to the
development of these metabolic disorders. Recent studies indicate that alteration
of intracellular Ca(2+) levels and downstream Ca(2+)-dependent signaling pathways
appear to modulate gene transcription and the activities of many enzymes involved
in cellular metabolism. Ca(2+) uptake into mitochondria modulates a number of
Ca(2+)-dependent proteins and enzymes participating in fatty acids metabolism,
tricarboxylic acid cycle, oxidative phosphorylation and apoptosis in response to
physiological and pathophysiological conditions. Mitochondrial calcium uniporter
(MCU) complex has been identified as a major channel located on the inner
membrane to regulate Ca(2+) transport into mitochondria. Recent studies of MCU
complex have increased our understanding of the modulation of mitochondrial
function and retrograde signaling to the nucleus via regulation of the
mitochondrial Ca(2+) level. Mitochondria couple cellular metabolic state by
regulating not only their own Ca(2+) levels, but also influence the entire
network of cellular Ca(2+) signaling. The mitochondria-associated ER membranes
(MAMs), which are specialized structures between ER and mitochondria, are
responsible for efficient communication between these organelles. Defects in the
function or structure of MAMs have been observed in affected tissue cells in
metabolic disease or neurodegenerative disorders. We demonstrated that
dysregulation of intracellular Ca(2+) homeostasis due to mitochondrial
dysfunction or defects in the function of MAMs are involved in the pathogenesis
of insulin insensitivity and T2D. These observations suggest that mitochondrial
dysfunction and disturbance of Ca(2+) homeostasis warrant further studies to
assist the development of therapeutics for prevention and medication of insulin
resistance and T2D.
|*Homeostasis
[MESH]
|Calcium/*physiology
[MESH]
|Diabetes Mellitus, Type 2/*physiopathology
[MESH]