Cell death and ultrastructural alterations in Leishmania amazonensis caused by new compound 4-Nitrobenzaldehyde thiosemicarbazone derived from S-limonene

被引:61
作者
Britta, Elizandra Aparecida [1 ]
Scariot, Debora Botura [1 ]
Falzirolli, Hugo [2 ]
Ueda-Nakamura, Tania [1 ]
Silva, Cleuza Conceicao [2 ]
Dias Filho, Benedito Prado [1 ]
Borsali, Redouane [3 ]
Nakamura, Celso Vataru [1 ]
机构
[1] Univ Estadual Maringa, Programa Posgrad Ciencias Farmaceut, BR-5790 Maringa, PR, Brazil
[2] Univ Estadual Maringa, Dept Quim, BR-5790 Maringa, PR, Brazil
[3] Univ Grenoble Alpes, CERMAV, CNRS, UPR 5301, F-38000 Grenoble, France
关键词
Antileishmanial activity; Benzaldehyde thiosemicarbazone; Leishmania amazonensis; Ultrastructural alterations; Mitochondria damage; Electron microscopy; Cellular disorganization; MITOCHONDRIAL DYSFUNCTION; BIOLOGICAL-ACTIVITY; TRYPANOCIDAL ACTION; AMASTIGOTE FORMS; IN-VITRO; INHIBITION; BIOSYNTHESIS; DERIVATIVES;
D O I
10.1186/s12866-014-0236-0
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Background: The treatment of leishmaniasis with pentavalent antimonials is problematic because of their toxicity. Investigations of potentially active molecules are important to discover less toxic drugs that are viable economic alternatives for the treatment of leishmaniasis. Thiosemicarbazones are a group of molecules that are known for their wide versatility and biological activity. In the present study, we examined the antileishmania activity, mechanism of action, and biochemical alterations produced by a novel molecule, 4-nitrobenzaldehyde thiosemicarbazone (BZTS), derived from S-limonene against Leishmania amazonensis. Results: BZTS inhibited the growth of the promastigote and axenic amastigote forms, with an IC50 of 3.8 and 8.0 mu M, respectively. Intracellular amastigotes were inhibited by the compound with an IC50 of 7.7 mu M. BZTS also had a CC50 of 88.8 mu M for the macrophage strain J774A1. BZTS altered the shape, size, and ultrastructure of the parasites, including damage to mitochondria, reflected by extensive swelling and disorganization of the inner mitochondrial membrane, intense cytoplasmic vacuolization, and the presence of concentric membrane structures inside the organelle. Cytoplasmic lipid bodies, vesicles inside vacuoles in the flagellar pocket, and enlargement were also observed. BZTS did not induce alterations in the plasma membrane or increase annexin-V fluorescence intensity, indicating no phosphatidylserine exposure. However, it induced the production of mitochondrial superoxide anion radicals. Conclusions: The present results indicate that BZTS induced dramatic effects on the ultrastructure of L. amazonensis, which might be associated with mitochondrial dysfunction and oxidative damage, leading to parasite death.
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