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Open Access Research article

Resistance of Leishmania (Viannia) braziliensis to nitric oxide: correlation with antimony therapy and TNF-α production

Anselmo S Souza1, Angela Giudice1, Júlia MB Pereira1, Luís H Guimarães1, Amelia R de Jesus2, Tatiana R de Moura2, Mary E Wilson3, Edgar M Carvalho1 and Roque P Almeida2*

Author Affiliations

1 Serviço de Imunologia, Hospital Universitário Prof. Edgard Santos, Universidade Federal da Bahia, Salvador, Bahia, Brazil

2 Universidade Federal de Sergipe, Aracaju, Sergipe, Brazil

3 Departments of Internal Medicine, Microbiology and Epidemiology, University of Iowa and the VA Medical Center, Iowa City, IA, USA

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BMC Infectious Diseases 2010, 10:209  doi:10.1186/1471-2334-10-209

Published: 15 July 2010

Abstract

Background

Nitric oxide (NO) produced in macrophages plays a pivotal role as a leishmanicidal agent. A previous study has demonstrated that 20% of the L. (V.) braziliensis isolated from initial cutaneous lesions of patients from the endemic area of Corte de Pedra, Bahia, Brazil, were NO resistant. Additionally, 5 to 11% of the patients did not respond to three or more antimony treatments" (refractory patients). The aim of this study is to investigate if there is an association between the resistance of L. (V.) braziliensis to NO and nonresponsiveness to antimony therapy and cytokine production.

Methods

We evaluated the in vitro toxicity of NO against the promastigotes stages of L. (V.) braziliensis isolated from responsive and refractory patients, and the infectivity of the amastigote forms of these isolates against human macrophages. The supernatants from Leishmania infected macrophage were used to measure TNF-α and IL-10 levels.

Results

Using NaNO2 (pH 5.0) as the NO source, L. (V.) braziliensis isolated from refractory patients were more NO resistant (IC50 = 5.8 ± 4.8) than L. (V.) braziliensis isolated from responsive patients (IC50 = 2.0 ± 1.4). Four isolates were selected to infect human macrophages: NO-susceptible and NO-resistant L. (V.) braziliensis isolated from responsive and refractory patients. NO-resistant L. (V.) braziliensis isolated from refractory patients infected more macrophages stimulated with LPS and IFN-γ at 120 hours than NO-susceptible L. (V.) braziliensis isolated from refractory patients. Also, lower levels of TNF-α were detected in supernatants of macrophages infected with NO-resistant L. (V.) braziliensis as compared to macrophages infected with NO-susceptible L. (V.) braziliensis (p < 0.05 at 2, 24 and 120 hours), while no differences were detected in IL-10 levels.

Conclusion

These data suggest that NO resistance could be related to the nonresponsiveness to antimony therapy seen in American Tegumentary Leishmaniasis.