Production of adiponectin, an anti-inflammatory protein, in mesenteric adipose tissue in Crohn's disease.
OBJECTIVE
A characteristic feature of Crohn's disease (CD) is mesenteric adipose tissue hypertrophy. Mesenteric adipocytes or specific proteins secreted by them may play a role in the pathogenesis of CD. We recently identified adiponectin as an adipocyte specific protein with anti-inflammatory properties. Here we report on expression of adiponectin in mesenteric adipose tissue of CD patients.


RESULTS
Mesenteric adipose tissue specimens were obtained from patients with CD (n = 22), ulcerative colitis (UC) (n = 8) and, for controls, colon carcinoma patients (n = 28) who underwent intestinal resection. Adiponectin concentrations were determined by enzyme linked immunosorbent assay, and adiponectin mRNA levels were determined by real time quantitative reverse transcription-polymerase chain reaction. Tissue concentrations and release of adiponectin were significantly increased in hypertrophied mesenteric adipose tissue of CD patients compared with normal mesenteric adipose tissue of CD patients (p = 0.002, p = 0.040, respectively), UC patients (p = 0.002, p = 0.003), and controls (p<0.0001, p<0.0001). Adiponectin mRNA levels were significantly higher in hypertrophied mesenteric adipose tissue of CD patients than in paired normal mesenteric adipose tissue from the same subjects (p = 0.024). Adiponectin concentrations in hypertrophied mesenteric adipose tissue of CD patients with an internal fistula were significantly lower than those of CD patients without an internal fistula (p = 0.003).


CONCLUSIONS
Our results suggest that adipocytes in hypertrophied mesenteric adipose tissue produce and secrete significant amounts of adiponectin, which could be involved in the regulation of intestinal inflammation associated with CD.
Yamamoto
K
K
Department of Internal Medicine and Molecular Science, Graduate School of Medicine, Osaka University, 2-2 B-5, Yamadaoka, Suita 565-0871, Japan.
Kiyohara
T
T
Murayama
Y
Y
Kihara
S
S
Okamoto
Y
Y
Funahashi
T
T
Ito
T
T
Nezu
R
R
Tsutsui
S
S
Miyagawa
J-I
JI
Tamura
S
S
Matsuzawa
Y
Y
Shimomura
I
I
Shinomura
Y
Y
D017667:Adipocytes / Q000378:metabolism / Q000473:pathology; D052242:Adiponectin; D000273:Adipose Tissue / Q000378:metabolism* / Q000473:pathology; D000328:Adult; D015992:Body Mass Index; D016022:Case-Control Studies; D003424:Crohn Disease / Q000378:metabolism* / Q000473:pathology; D005260:Female; D006801:Humans; D006984:Hypertrophy; D036341:Intercellular Signaling Peptides and Proteins / Q000378:metabolism*; D015850:Interleukin-6 / Q000378:metabolism; D008297:Male; D008643:Mesentery / Q000378:metabolism* / Q000473:pathology; D008875:Middle Aged; D012333:RNA, Messenger / Q000378:metabolism
D052242:Adiponectin; D036341:Intercellular Signaling Peptides and Proteins; D015850:Interleukin-6; D012333:RNA, Messenger