Abstract
To investigate the importance of serine proteases in Leishmania amazonensis promastigotes, we analyzed the effects of classical serine protease inhibitors and a Kunitz-type inhibitor, obtained from sea anemone Stichodactyla helianthus (ShPI-I), on the viability and morphology of parasites in culture. Classical inhibitors were selected on the basis of their ability to inhibit L. amazonensis serine proteases, previously described. The N-tosyl-l-phenylalanine chloromethyl ketone (TPCK) and benzamidine (Bza) inhibitors, which are potential Leishmania proteases inhibitors, in all experimental conditions reduced the parasite viability, with regard to time dependence. On the other hand, N-tosyl-lysine chloromethyl ketone (TLCK) did not significantly affect the parasite viability, as it was poor Leishmania enzymes inhibitor. Ultrastructural analysis demonstrated that both Bza and TPCK induced changes in the flagellar pocket region with membrane alteration, including bleb formation. However, TPCK effects were more pronounced than those of Bza in Leishmania flagellar pocket in plasma membrane, and intracellular vesicular bodies was visualized. ShPI-I proved to be a powerful inhibitor of L. amazonensis serine proteases and the parasite viability. The ultrastructural alterations caused by ShPI-I were more dramatic than those induced by the classical inhibitors. Vesiculation of the flagellar pocket membrane, the appearance of a cytoplasmic vesicle that resembles an autophagic vacuole, and alterations of promastigotes shape resulted.
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Abbreviations
- BHI:
-
brain heart infusion
- BPTI:
-
bovine pancreatic trypsin inhibitor
- Bza:
-
benzamidine
- IC:
-
inhibitor concentration
- EM:
-
electron microscopy
- MTT:
-
3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide
- ShPI-I:
-
Kunitz-type protease inhibitor from sea anemone Stichodactyla helianthus
- L- TAME:
-
N-ρ-tosyl-l-arginine methyl ester
- TLCK:
-
N-tosyl-lysine chloromethyl ketone
- TPCK:
-
N-tosyl-l-phenylalanine chloromethyl ketone
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Acknowledgments
This work was supported with grants from Fundação de Amparo a Pesquisa do Estado do Rio de Janeiro (FAPERJ), Fundação Oswaldo Cruz (FIOCRUZ), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), and Fundação Ary Frauzino para Pesquisa e Controle do Câncer (FAF). We are grateful to Mr. Genival Alves de Souza and Marcelo Tanaka for technical assistance on Leishmania cultures and electron microscopy and Angel Ramirez for enzyme kinetic advices. This manuscript was revised by Mitchell Raymond Lishan, native of Chicago, IL, USA.
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Silva-Lopez, R.E., Morgado-Díaz, J.A., Chávez, M.A. et al. Effects of serine protease inhibitors on viability and morphology of Leishmania (Leishmania) amazonensis promastigotes. Parasitol Res 101, 1627–1635 (2007). https://doi.org/10.1007/s00436-007-0706-5
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DOI: https://doi.org/10.1007/s00436-007-0706-5