? Skin inflammation involves local production of cytokines, which mediate recruitment of leucocytes and altered gene expression and cellular phenotypes of keratinocytes and other cells residing in the skin. lnterleukin-1 (IL-1) is an important mediator of local and systemic inflammation. IL-1 acts via a receptor complex involving the IL-1 receptor type I (IL-1RI) and membrane bound IL-1 receptor accessory protein (mlL-1 RAcP). A soluble isoform of IL-1 RAcP (slL-1 RAcP) appears to be an inhibitor of IL-1 signaling. The Principal Investigator has identified a novel soluble isoform of IL-1 RAcP, slL-1RAcP-(3, which has a unique C-terminus. Recently discovered cytokines, related to IL-1, appear to have activities similar to IL-1, but act via a different membrane receptor, IL-1 receptor related protein 2 (IL-1Rrp2). IL-1Rrp2 is primarily expressed in epithelial tissues, and preliminary data suggests that different IL-1 family members orchestrate distinct immune responses by inducing distinct cytokine expression profiles in primary human keratinocytes. Interestingly, IL-1 Rrp2 also utilizes mlL-1 RAcP for intracellular signaling. The primary hypothesis is that the two different isoforms of soluble IL-1 RAcP, slL-1 RAcP and slL-1 RAcP-|3, may inhibit the activities of all IL-1 family members or a sub-set of these. Furthermore, proportional expression of the three different isoforms of IL-1 RAcP may determine cellular responses to inflammatory stimuli. Since IL-1Rrp2 is primarily expressed in epithelial cells the involved mechanism may play a significant role in skin homeostasis and inflammation. ecombinant soluble IL-1 RAcP proteins will be expressed and purified. Human keratinocytes will be treated with agonist IL-1 family members and activation of gene expression will be examined using quantitative reverse transcription PCR and ELISA assays. Activities of the two soluble IL-1 RAcP isoforms will be examined in co-treatment experiments with individual cytokines. Expression of the three different IL-1 RacP isoforms and the IL-1 family members in keratinocytes will be determined following treatments with known modulators of IL-1 RAcP proportional expression and members of the IL-1 family. This project will provide novel information about the function(s) of the novel IL-1 related cytokines and the two soluble IL-1 RacP isoforms. The ultimate goals are to elucidate molecular mechanisms regulating inflammation, identify defective pathways in diseases and utilize this knowledge to develop novel anti-inflammatory therapies. of this work would greatly benefit arthritic and musculoskeletal therapeutic areas. ? ? ?

Agency
National Institute of Health (NIH)
Institute
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Type
Small Research Grants (R03)
Project #
1R03AR053672-01A1
Application #
7193819
Study Section
Special Emphasis Panel (ZAR1-EHB-M (O1))
Program Officer
Mancini, Marie
Project Start
2007-09-01
Project End
2010-08-31
Budget Start
2007-09-01
Budget End
2008-08-31
Support Year
1
Fiscal Year
2007
Total Cost
$78,750
Indirect Cost
Name
University of Pennsylvania
Department
Pharmacology
Type
Schools of Medicine
DUNS #
042250712
City
Philadelphia
State
PA
Country
United States
Zip Code
19104
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Uribe-Herranz, Mireia; Lian, Li-Hua; Hooper, Kirsten M et al. (2013) IL-1R1 signaling facilitates Munro's microabscess formation in psoriasiform imiquimod-induced skin inflammation. J Invest Dermatol 133:1541-9
Lian, Li-Hua; Milora, Katelynn A; Manupipatpong, Katherine K et al. (2012) The double-stranded RNA analogue polyinosinic-polycytidylic acid induces keratinocyte pyroptosis and release of IL-36?. J Invest Dermatol 132:1346-53
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Sanmiguel, Julio C; Olaru, Florina; Li, Jieliang et al. (2009) Interleukin-1 regulates keratinocyte expression of T cell targeting chemokines through interleukin-1 receptor associated kinase-1 (IRAK1) dependent and independent pathways. Cell Signal 21:685-94