Macrophage activation and leishmanicidal activity by galactomannan and its oxovanadium (IV/V) complex in vitro.
J Inorg Biochem
; 132: 45-51, 2014 Mar.
Article
in En
| MEDLINE
| ID: mdl-24169303
ABSTRACT
Compounds that activate macrophage antimicrobial activity are potential targets for treatment of leishmaniasis. The present study investigated the in vitro immunomodulatory effects of a galactomannan (GALMAN-A) isolated from seeds of Mimosa scabrella and its oxovanadium (IV/V) complex (GALMAN-AVO(2+)/VO(3+)) on macrophage activity. GALMAN-A increased nitric oxide levels by ~33% at a concentration of 250µg/ml, while GALMAN-AVO(2+)/VO(3+) decreased nitric oxide levels by ~33% at a concentration of 50µg/ml. Furthermore, GALMAN-A increased interleukin-1 beta (IL-1ß) and interleukin-6 (IL-6) levels by 5.5 and 2.3 times, respectively, at a concentration of 25µg/ml; at the same concentration, GALMAN-AVO(2+)/VO(3+) promoted an increase in IL-1ß and IL-6 production by 8 and 5.5 times, respectively. However, neither GALMAN-A nor GALMAN-AVO(2+)/VO(3+) affected tumor necrosis factor alpha (TNF-α) or interleukin-10 (IL-10) levels. Importantly, both GALMAN-A and GALMAN-AVO(2+)/VO(3+) exhibited leishmanicidal activity on amastigotes of Leishmania (L.) amazonensis, reaching ~60% activity at concentrations of 100 and 25µg/ml, respectively. These results indicate that GALMAN-A is three times more potent and its oxovanadium complex is twelve times more potent than Glucantime (300µg/ml), which is the drug of choice in leishmaniasis treatment. The IC50 value for GALMAN-AVO(2+)/VO(3+) was 74.4µg/ml (0.58µg/ml of vanadium). Thus, the significant activation of macrophages and the noted leishmanicidal effect demonstrate the need for further studies to clarify the mechanisms of action of these compounds.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Vanadium
/
Coordination Complexes
/
Leishmania
/
Macrophage Activation
/
Mannans
Type of study:
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
J Inorg Biochem
Year:
2014
Document type:
Article
Affiliation country: