Abstract:
:To examine the mechanisms of diabetes-enhanced inflammation, ear inflammation was induced by 12-O-tetradecanoylphorbol-13-acetate (TPA) in streptozotocin (STZ)-injected diabetic and control mice. The inflammatory response was determined from ear thickness and histology. The mRNA expression of several inflammation-related genes 8, 24 and 32 h after TPA treatment was determined by quantitative real-time RT-PCR. Ear thickness did not differ between the two groups at 8 h, but was greater in the diabetic mice than control mice at 24 and 32 h (late phase). STZ-diabetic conditions variously affected TPA-induced gene expression. The changes 8 h after TPA treatment probably reflected transcriptional regulation, and the genes were divided into three groups, up-regulated (IL-6, MCP-1, HO-1 and SOCS3), unregulated (IL-1beta, TNF-alpha and IL-10) and down-regulated (RANTES) genes. TPA-induced gene expression of cytokines, except for RANTES, peaked at 8 h and significantly declined in the late phase in control mice, while the expression of IL-1beta and TNF-alpha did not decline in the late phase in the diabetic mice. This result indicated the destabilization process for these mRNA, a type of post-transcriptional regulation, to be impaired under STZ-induced diabetic conditions; however, TPA-induced gene and protein expression of TTP, an RNA-binding protein involved in mRNA decay, were adversely enhanced in the diabetic mice. These findings suggested that STZ-induced diabetes affected the transcriptional and post-transcriptional control of TPA-induced inflammation, and greater mRNA levels of IL-1beta and TNF-alpha in the late phase were probably responsible for the diabetes-enhanced inflammation.
journal_name
Int Immunopharmacoljournal_title
International immunopharmacologyauthors
Iba Y,Watanabe K,Ozaki K,Aozasa O,Ishizawa K,Matsuura T,Oyama H,Masukawa Tdoi
10.1016/j.intimp.2013.01.007subject
Has Abstractpub_date
2013-03-01 00:00:00pages
614-9issue
3eissn
1567-5769issn
1878-1705pii
S1567-5769(13)00021-0journal_volume
15pub_type
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