Rostamian M, Sohrabi S, Kavosifard H, Niknam HM. Lower levels of IgG1 in comparison with IgG2a are associated with protective immunity against Leishmania tropica infection in BALB/c mice.
J Microbiol Immunol Infect 2015;
50:160-166. [PMID:
26066544 DOI:
10.1016/j.jmii.2015.05.007]
[Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Revised: 04/06/2015] [Accepted: 05/05/2015] [Indexed: 10/23/2022]
Abstract
BACKGROUND/PURPOSE
Leishmania (L.) tropica is the causative agent of different forms of human leishmaniasis. There is little information about the role of Leishmania-specific antibodies in the immune response against L. tropica infection. The aim of this study is to evaluate the role of Leishmania-specific antibodies and their immunoglobulin G (IgG) isotypes in L. tropica infection.
METHODS
L. tropica at two different doses (high dose, 106 parasites/mouse and low dose, 103 parasites/mouse) were used for infection of BALB/c mice. BALB/c mice infected with Leishmania major were used for comparison. Anti-Leishmania antibodies of the IgG1 and IgG2a isotypes were assayed by enzyme-linked immunosorbent assay.
RESULTS
Our data showed that (1) a higher parasite dose results in higher levels of antibody. (2) L. tropica infection results in a lower IgG1 antibody response, compared with L. major infection. (3) The IgG2a/IgG1 antibody response in L. tropica infection is higher than that in L. major infection.
CONCLUSION
A higher IgG2a/IgG1 ratio is associated with protective immune response in L. tropica infection. These data can help to approach the complex profile of immunity against L. tropica infection.
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