Nucleotide oligomerization domains 1 and 2: regulation of expression and function in preadipocytes

The Journal of Immunology : Official Journal of the American Association of Immunologists
Thorsten StrohBritta Siegmund

Abstract

Translocation of bacteria into the mesenteric fat during intestinal inflammation and the expression of functional TLR1-9 in murine preadipocytes and adipocytes suggest an active role for these cells in innate immunity. The present study focuses on nucleotide oligomerization domains 1 and 2 representing intracellular pattern recognition receptors that sense motifs derived from bacterial peptidoglycans. On mRNA level nucleotide oligomerization domain 1 was found to be constitutively expressed in the preadipocyte cell line 3T3L1 and in primary preadipocytes isolated from murine mesenteric fat, while nucleotide oligomerization domain 2 was only weakly expressed by these cells. Treatment with lactyl-tetra-diaminopimelic acid, muramyl dipeptide, LPS, IL-1beta, and TNF-alpha did not affect cellular nucleotide oligomerization domain 1 mRNA amounts. Except muramyl dipeptide, all factors significantly increased nucleotide oligomerization domain 2 mRNA in mesenteric fat preadipocytes after 4 h. However, specific stimulation of nucleotide oligomerization domain 1 induced IL-6 synthesis in preadipocytes from wild-type or TLR2/4-deficient mice. Confirming nucleotide oligomerization domain 1 specificity, transfection of nucleotide oligomeriza...Continue Reading

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Citations

Feb 9, 2012·Journal of Obesity·Kristina HarrisChieh J Chou
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