Paracoccidioides brasiliensis uses endogenous and exogenous arachidonic acid for PGE x production.
Paracoccidioides brasiliensis is the agent of paracoccidioidomycosis, the most prevalent deep mycosis in Latin America. Production of eicosanoids during fungal infections plays a critical role on fungal biology as well as on host immune response modulation. The purpose of our study was to assess whether P. brasiliensis strains with different degree of virulence (Pb18, Pb265, Bt79, Pb192) produce prostaglandin E(x) (PGE(x)). Moreover, we asked if P. brasiliensis could use exogenous sources of arachidonic acid (AA), as well as metabolic pathways dependent on cyclooxygenase (COX) enzyme, as reported for mammalian cells. A possible association between this prostanoid and fungus viability was also assessed. Our results showed that all strains, independently of their virulence, produce high PGE(x) levels on 4 h culture that were reduced after 8 h. However, in both culture times, higher prostanoid levels were detected after supplementation of medium with exogenous AA. Treatment with indomethacin, a COX inhibitor, induced a reduction on PGEx, as well as in fungus viability. The data provide evidence that P. brasiliensis produces prostaglandin-like molecules by metabolizing either endogenous or exogenous AA. Moreover, the results suggest the involvement of these mediators on fungal viability.
Biondo
Guilherme Augusto
GA
Departamento de Microbiologia e Imunologia, Instituto de Biociências, UNESP - Universidade Estadual Paulista, Campus Botucatu, Rubião Júnior, Botucatu, SP, CEP 18618-000, Brazil.
Dias-Melicio
Luciane Alarcão
LA
Bordon-Graciani
Ana Paula
AP
Acorci-Valério
Michele Janegitz
MJ
Soares
Angela Maria Victoriano Campos
AM
D000935:Antifungal Agents / Q000378:metabolism; D016718:Arachidonic Acid / Q000378:metabolism*; D003470:Culture Media / Q000737:chemistry; D005656:Fungal Proteins / Q000378:metabolism; D007213:Indomethacin / Q000378:metabolism; D050296:Microbial Viability; D010228:Paracoccidioides / Q000378:metabolism* / Q000472:pathogenicity; D011451:Prostaglandin-Endoperoxide Synthases / Q000378:metabolism; D011458:Prostaglandins E / Q000096:biosynthesis*
D000935:Antifungal Agents; D003470:Culture Media; D005656:Fungal Proteins; D011458:Prostaglandins E; D016718:Arachidonic Acid; D011451:Prostaglandin-Endoperoxide Synthases; D007213:Indomethacin