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Biphasic Role of Platelet‐Activating Factor in Oral Mucosal Ulcer Healing
Author(s) -
Slomiany Bronislaw,
Slomiany Amalia
Publication year - 2003
Publication title -
iubmb life
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.132
H-Index - 113
eISSN - 1521-6551
pISSN - 1521-6543
DOI - 10.1080/15216540310001602814
Subject(s) - wound healing , medicine , inflammation , apoptosis , tumor necrosis factor alpha , pharmacology , phosphatidylserine , immunology , phospholipid , biology , biochemistry , membrane
Platelet‐activating factor (PAF) is a potent phospholipid‐derived messenger molecule involved in a number of pathological conditions, including mediation of inflammatory cascades associated with wound healing. We investigated prophylactic and therapeutic effects of a specific PAF antagonist, BN52020, on the course of experimentally induced oral mucosal ulcer healing. The prophylactic BN52020 administration produced an accelerated ulcer healing that was characterized by a marked induction in COX‐2 enzyme protein expression and the substantial decline in apoptosis, TNF‐ α, and NOS‐2 activity. A delay in ulcer healing, however, occurred with the therapeutic BN52020 administration, and this effect of the agent was reflected in a decreased expression of COX‐2 protein, higher rate of apoptosis, and the elevated level of TNF‐ αand NOS‐2. Our findings implicate PAF requirement in orderly progression of the events involved in oral tissue repair, and suggest that the interference with its actions during healing process results in the suppression of COX‐2‐derived anti‐inflammatory prostaglandins that delay the mucosal repair. IUBMB Life, 55: 483‐490, 2003