TY - JOUR
T1 - Intrahepatic lipid, not visceral or muscle fat, is correlated with insulin resistance in older, female rhesus macaques
AU - Chu, Michael P.
AU - Klopfenstein, Bethany J.
AU - Krisky, Christine M.
AU - Urbanski, Henryk F.
AU - Rooney, William D.
AU - Kohama, Steven G.
AU - Purnell, Jonathan Q.
PY - 2013/10
Y1 - 2013/10
N2 - Objective Little is known of the effect of body composition on glucose metabolism in the aging female non-human primate. These variables in older female Rhesus macaques were studied. Design and Methods Female Rhesus macaques (Macaca mulatta, n = 19, age range 23-30 years) underwent magnetic resonance imaging and 1H spectroscopy to quantify total abdominal fat, visceral fat (VF), subcutaneous fat (SF) area, extramyocellular lipid (EMCL), intramyocellular lipid (IMCL) and intrahepatic lipid (IHL) content, and DEXA scan for whole body composition. A subgroup (n = 12) underwent a fasting blood draw and intravenous glucose tolerance test. Results SF correlated with homeostatic model assessment of insulin resistance (HOMAIR) and quantitative insulin sensitivity check index (QUICKI), but not after adjustment for fat mass. IHL demonstrated the strongest correlation with HOMAIR, QUICKI and calculated insulin sensitivity index (CSI), and remained significant after adjustment for fat mass. VF, IMCL, and EMCL did not correlate with any of our measures of insulin sensitivity. Conclusions Despite a greater amount of VF compared to SF, VF was not associated with markers of insulin resistance (IR) in the older female monkey. Instead, IHL is a marker for IR in the fasting and post-prandial state in these animals.
AB - Objective Little is known of the effect of body composition on glucose metabolism in the aging female non-human primate. These variables in older female Rhesus macaques were studied. Design and Methods Female Rhesus macaques (Macaca mulatta, n = 19, age range 23-30 years) underwent magnetic resonance imaging and 1H spectroscopy to quantify total abdominal fat, visceral fat (VF), subcutaneous fat (SF) area, extramyocellular lipid (EMCL), intramyocellular lipid (IMCL) and intrahepatic lipid (IHL) content, and DEXA scan for whole body composition. A subgroup (n = 12) underwent a fasting blood draw and intravenous glucose tolerance test. Results SF correlated with homeostatic model assessment of insulin resistance (HOMAIR) and quantitative insulin sensitivity check index (QUICKI), but not after adjustment for fat mass. IHL demonstrated the strongest correlation with HOMAIR, QUICKI and calculated insulin sensitivity index (CSI), and remained significant after adjustment for fat mass. VF, IMCL, and EMCL did not correlate with any of our measures of insulin sensitivity. Conclusions Despite a greater amount of VF compared to SF, VF was not associated with markers of insulin resistance (IR) in the older female monkey. Instead, IHL is a marker for IR in the fasting and post-prandial state in these animals.
UR - http://www.scopus.com/inward/record.url?scp=84885379889&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84885379889&partnerID=8YFLogxK
U2 - 10.1002/oby.20339
DO - 10.1002/oby.20339
M3 - Article
C2 - 23408675
AN - SCOPUS:84885379889
SN - 1930-7381
VL - 21
SP - 2021
EP - 2028
JO - Obesity
JF - Obesity
IS - 10
ER -