Abstract:
:Involvement of imbalance between pro- and anti-inflammatory events has been reported in the developed pathogenesis after scorpion envenomation. The immunosuppressive and anti-inflammatory properties of tacrolimus (FK-506) have been investigated: i) to better understand evolution of signaling pathways which are involved in the immune system ii) to reduce observed clinical signs while keeping a balance between pro- and anti-inflammatory cytokines. Naval Medical Research Institute (NMRI) mice received tacrolimus (1 mg/kg every 12 hours per os) for 21 days before envenomation with a sublethal dose (10 microg/20 g body weight) of Androctonus australis hector venom (Aah). Cell migration, pulmonary edema, exudation, Myeloperoxydase (MPO), Eosinophil peroxydase (EPO), C-reactive protein (CRP), C3, Creatine phosphokinase (CPK), aspartate aminotransferase (ASAT), alanine aminotransferase (ALAT), and hyperglycemia were analyzed 30 min, 3 and 24 hours after injection of Aah venom. Histological analysis of lung parenchyma was undertaken 24 hours after envenomation. Aah lethality was evaluated on mice with or without pretreatment with tacrolimus. (Fab)2 fragments (40 mg/kg) were also used as specific treatment in all protocols. Tacrolimus significantly inhibited cell migration, pulmonary edema, exudation, CRP and hyperglycemia. It also decreased MPO and EPO activities and prevented tissue damage in lung tissue, balancing seric parameter levels (CPK, ASAT and ALAT). The pretreated animals seemed to be protected by this macrolide against the venom lethality. These findings suggest that the overactivation of the immune system is one of the causes involved in the aggravation of the pathophysiological effects induced after envenomation. The obtained results showed that the use of F(ab)2 fragments as specific treatment cannot reduce the induced inflammatory response.
journal_name
Int J Immunopathol Pharmacolauthors
Kabrine M,Laraba-Djebari Fdoi
10.1177/039463201402700109subject
Has Abstractpub_date
2014-01-01 00:00:00pages
69-78issue
1eissn
0394-6320issn
2058-7384pii
9journal_volume
27pub_type
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