C-reactive protein levels are inversely correlated with the apolipoprotein B-48-containing triglyceride-rich lipoprotein production rate in insulin resistant men.
The pro-inflammatory state and elevated plasma levels of post-prandial triglycerides (TG) are associated with increased cardiovascular disease risk. Recent studies suggested that the increase in the production rate of post-prandial lipoproteins observed in patients with insulin resistance (IR) may be caused, at least in part, by the dysregulation of intestinal insulin sensitivity triggered by inflammation.



The objective of the present study was to evaluate the association between IR, plasma C-reactive protein (CRP) levels and the kinetics of TG-rich lipoprotein (TRL) containing apolipoprotein (apo) B-48 in a large sample of insulin sensitive (IS) and IR men.



The in vivo kinetics of TRL apoB-48 were measured in 151 men following a primed-constant infusion of l-[5,5,5-D3]leucine. IR subjects (n=91) were characterized by fasting TG levels ≥1.5mmol/L and an index of homeostasis model assessment of IR (HOMA-IR)≥2.5 or type 2 diabetes, while IS subjects (n=24) were characterized by an HOMA-IR index <2.5 and TG levels <1.5mmol/L.



IR subjects had higher TRL apoB-48 production rate (+202%; P<0.0001) and CRP levels (+51%; P=0.01) than IS subjects. TRL apoB-48 production rate and CRP levels were inversely correlated in IR subjects (r=-0.32; P=0.002). IR subjects with CRP levels above the median (2.20mg/L) had lower TRL apoB-48 production rate than IR subjects with CRP levels below the median (Δ=-24%; P<0.05).



Our results confirm that IR is associated with increased TRL apoB-48 secretion and suggest that a higher inflammatory status is associated with decreased TRL apoB-48 secretion among IR subjects.
Institute of Nutrition and Functional Foods, Laval University, Quebec City, Canada.
Jean-Philippe
JP
Drouin-Chartier
Institute of Nutrition and Functional Foods, Laval University, Quebec City, Canada.
André J
AJ
Tremblay
CHUQ Research Center, Laval University, Quebec City, Canada.
Jean-Charles
JC
Hogue
Institute of Nutrition and Functional Foods, Laval University, Quebec City, Canada.
Myriam
M
Leclerc
Institute of Nutrition and Functional Foods, Laval University, Quebec City, Canada.
Marie-Ève
MÈ
Labonté
Institute of Nutrition and Functional Foods, Laval University, Quebec City, Canada.
Johanne
J
Marin
Institute of Nutrition and Functional Foods, Laval University, Quebec City, Canada.
Benoît
B
Lamarche
Institute of Nutrition and Functional Foods, Laval University, Quebec City, Canada; CHUQ Research Center, Laval University, Quebec City, Canada. Electronic address: patrick.couture@crchul.ulaval.ca.
Patrick
P
Couture
D000328:Adult; D000886:Anthropometry; D053283:Apolipoprotein B-48 / Q000378:metabolism*; D015992:Body Mass Index; D002097:C-Reactive Protein / Q000032:analysis*; D006706:Homeostasis; D006801:Humans; D007333:Insulin Resistance; D007700:Kinetics; D008055:Lipids / Q000097:blood; D008074:Lipoproteins / Q000096:biosynthesis*; D008297:Male; D008875:Middle Aged; D014280:Triglycerides / Q000096:biosynthesis*
D053283:Apolipoprotein B-48; D008055:Lipids; D008074:Lipoproteins; D014280:Triglycerides; C030087:lipoprotein triglyceride; D002097:C-Reactive Protein
Apolipoprotein B-48; CRP; Inflammation; Insulin resistance