Journal
JOURNAL OF INFECTIOUS DISEASES
Volume 185, Issue 5, Pages 673-681Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/339260
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This study investigated whether Leishmania species, the etiologic agent of cutaneous (Leishmania major) and visceral (Leishmania donovani) leishmaniasis, could differentially elicit early inflammatory events in vivo correlating with the subsequent development of their reciprocal pathogenesis. By use of the murine air pouch system, injection of Leishmania led to a rapid and transient accumulation of a mixed population of leukocytes, and L. major recruited 31-fold more leukocytes than did controls, compared with 7-fold more leukocytes for L. donovani. L. major promastigotes were better than L. donovani promastigotes at inducing proinflammatory cytokine secretion and chemokine gene expression in pouch exudates. L. major infection elicited significantly increased chemokine receptor gene expression, compared with L. donovani infection. Collectively, the data reveal that L. major is a strong inducer of the early inflammatory response, compared with L. donovani, and suggest that such an immunologic event potentially could restrain this parasite to the inoculation site, favoring the development of local swelling and cutaneous lesions.
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