Expression of tumor necrosis factor (TNF)-alpha protein in the subcutaneous and visceral adipose tissue in correlation with adipocyte cell volume, serum TNF-alpha, soluble serum TNF-receptor-2 concentrations and C-peptide level.

Abstract:

OBJECTIVE:The aim of the study was to evaluate the expression of tumor necrosis factor (TNF)-alpha protein in the subcutaneous and visceral adipose tIssue in correlation with adipocyte cell Volume, serum TNF-alpha, soluble TNF-receptor-2 (sTNFR-2) and indirect parameters of insulin resistance in overweight/obese and lean healthy persons. DESIGN:A cross-sectional case-control study was used. PATIENTS:Twenty-eight overweight/obese probands with normal glucose tolerance (BMI>27 kg/m(2)) and 15 lean people (BMI<25 kg/m(2)), all of them undergoing planned surgical operation, participated in the study. METHODS:Two to four grams of subcutaneous and visceral adipose tIssue were removed and studied using semi-quantitative immunohistochemical staining of the TNF-alpha protein. Serum TNF-alpha, sTNFR-2 (ELISA) and fasting C-peptide (RIA) were measured. RESULTS:TNF-alpha protein was expressed in adipocytes of both depots. The expression was evaluated visually and found to be greater in the obese patients. Significantly higher serum TNF-alpha (5.58+/-0.87 pg/ml vs 4.21+/-0.55, mean+/-s.d., P<0.01, Mann-Whitney) and sTNFR-2 levels (7.84+/-3.56 ng/ml vs 4.59+/-1.35, P=0.005) were found in the obese subgroup in correlation with the fasting C-peptide level (r=0.49, P=0.003; and r=0.74, P=0.001) and the C-peptide/ blood glucose ratio (r=0.47, Spearman, P=0.005; and r=0.70, P=0.001). The cell Volume of both adipocyte depots was found to have a significant positive correlation with serum TNF-alpha and sTNFR-2 levels in the total group of patients (subcutaneous: r=0.52, P=0.0003; r=0.69, P<0.0001; visceral: r=0.65, P<0.0001; r=0.63, P<0.0001) and in both subgroups. CONCLUSIONS:Adipocyte cell Volume of both the subcutaneous and visceral fat depots may be determinants of TNF-alpha, sTNFR-2 production and obesity-linked insulin resistance.

journal_name

Eur J Endocrinol

authors

Winkler G,Kiss S,Keszthelyi L,Sápi Z,Ory I,Salamon F,Kovács M,Vargha P,Szekeres O,Speer G,Karádi I,Sikter M,Kaszás E,Dworak O,Gerö G,Cseh K

doi

10.1530/eje.0.1490129

subject

Has Abstract

pub_date

2003-08-01 00:00:00

pages

129-35

issue

2

eissn

0804-4643

issn

1479-683X

journal_volume

149

pub_type

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