Antigenic extracts of Leishmania braziliensis and Leishmania amazonensis associated with saponin partially protects BALB/c mice against Leishmania chagasi infection by suppressing IL-10 and IL-4 production

作者：Grenfell Rafaella F Q^*; Marques da Silva Eduardo A; Souza Testasicca Miriam C; Coelho Eduardo A F; Fernandes Ana Paula; Afonso Luis Carlos C; Rezende Simone A

来源：Memorias do Instituto Oswaldo Cruz, 2010, 105(6): 818-822.

DOI：10.1590/S0074-02762010000600015

• vaccine
• Leishmania chagasi
• Leishmania braziliensis
• Leishmania amazonensis
• IL-10
• IL-4

This study evaluated two vaccine candidates for their effectiveness in protecting BALB/c mice against Leishmania chagasi infection. These immunogenic preparations were composed of Leishmania amazonensis or Leishmania braziliensis antigenic extracts in association with saponin adjuvant. Mice were given three subcutaneous doses of one of these vaccine candidates weekly for three weeks and four weeks later challenged with promastigotes of L. chagasi by intravenous injection. We observed that both vaccine candidates induced a significant reduction in the parasite load of the liver, while the L. amazonensis antigenic extract also stimulated a reduction in spleen parasite load. This protection was associated with a suppression of both interleukin (IL)-10 and IL-4 cytokines by spleen cells in response to L. chagasi antigen. No change was detected in the production of IFN-gamma. Our data show that these immunogenic preparations reduce the type 2 immune response leading to the control of parasite replication.

• 出版日期2010-9