Article

Effect of aging on the expression of intracellular Ca2+ transport proteins in a rat heart

Molecular and Cellular Biochemistry (impact factor: 2.06). 06/2007; 301(1):219-226. DOI:10.1007/s11010-007-9414-9 pp.219-226

ABSTRACT Aging process is accompanied by various biological dysfunctions including altered calcium homeostasis. Modified calcium handling
might be responsible for changed cardiac function and potential development of the pathological state. In the present study
we compared the mRNA and protein levels of the intracellular Ca2+-handling proteins—inositol 1,4,5-trisphosphate receptor (IP3R), ryanodine receptor (RyR), sarcoplasmic reticulum Ca2+ pump (SERCA2), and also transient receptor potential C (TRPC) channels in cardiac tissues of 5-, 15-, and 26-month-old rats.
Aging was accompanied by significant increase in the mRNA levels of IP3R and TRPC channels in both ventricles and atria, but mRNA level of the type 2 RyR was unchanged. Protein content of the IP3R1 correlated with mRNA levels, in the left ventricle of 15- and 26-month-old rats the value was approximately 1.8 and 2.8-times
higher compared to 5-month-old rats. No significant differences were observed in mRNA and protein levels of the SERCA2 among
5-month-old and aged rats. However, Ca2+-ATPase activity significantly decreased with age, activities in 5-, 15-, and 26-month-old rats were 421.2±13.7, 335.5±18.1
and 304.6±14.8nmolPimin-1mg−1. These results suggest that altered transporting activity and/or gene expression of Ca2+-handling proteins of intracellular Ca2+ stores might affect cardiac function during aging.

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Keywords

26-month-old rats
 
5-month-old rats
 
Aging process
 
Ca2+-ATPase activity
 
calcium homeostasis
 
gene expression
 
intracellular Ca2+ stores
 
intracellular Ca2+-handling proteins—inositol 1,4,5-trisphosphate receptor
 
IP3R1 correlated
 
left ventricle
 
Modified calcium handling
 
mRNA levels
 
pathological state
 
potential development
 
protein levels
 
sarcoplasmic reticulum Ca2+ pump
 
transient receptor potential C
 
type 2 RyR
 
various biological dysfunctions
 
ventricles