A comparative evaluation of immunotoxicity of malathion after subchronic exposure in experimental animals.

Abstract:

:The effects of sub-chronic doses of malathion exposure on humoral and cell-mediated immune (CMI) responses were studied in male albino mice, rats and rabbits using sheep red blood cells (SRBC), tetanus toxoid and ovalbumin as antigens. The humoral immune response was assessed by estimating serum immunoglobulin (IgM and IgG) concentrations, antibody titre against antigens and splenic-plaque forming cells (PFC). The CMI response was studied by using the leucocyte migration inhibition (LMI) and macrophage migration inhibition (MMI) tests. In general there were (a) attenuation in antigen induced antibody response, (b) suppression of PFC, and (c) marked inhibition of LMI and MMI factors. Sub-chronic malathion exposure induced differential degrees of humoral and CMI suppression in these experimental animals. However, both cellular and humoral immune responses were decreased in a dose-time dependent pattern and a consistent trend was observed. The threshold level of the malathion for inducing immune suppression depends on the animal species, type of antigen used, and the method of immunological assay. In view of the widespread use of malathion a comparative assessment of immune responses using different experimental animals and antigens is an important aspect of its safety evaluation.

journal_name

Indian J Exp Biol

authors

Banerjee BD,Pasha ST,Hussain QZ,Koner BC,Ray A

subject

Has Abstract

pub_date

1998-03-01 00:00:00

pages

273-82

issue

3

eissn

0019-5189

issn

0975-1009

journal_volume

36

pub_type

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