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Human & Experimental Toxicology
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Effect of lead exposure on serum immunoglobulins and reactive nitrogen and oxygen intermediate

K P Mishra

Department of Immunology, Sanjay Gandhi Post-Graduate Institute of Medical Sciences, Lucknow 226 014, India; Defence Institute of Physiology and Allied Sciences, Lucknow Road, Timarpur, Delhi 110054, India; kpmpgi{at}rediffmail.com

U K Chauhan

Centre for Biotechnology Studies, School of Environmental Biology, A.P.S. University Rewa (M.P.) 486003, India

Sita Naik

Department of Immunology, Sanjay Gandhi Post-Graduate Institute of Medical Sciences, Lucknow 226 014, India

Metal toxicants may affect immune regulation with an increased incidence of infectious diseases, cancer or autoimmune diseases. Lead is the leading environmental toxin among heavy metals and has aroused concern, as continuous low-level exposure leads to a variety of health problems. We compared serum immunoglobulins (Ig) and reactive oxygen and nitrogen intermediates (super oxide and nitric oxide (NO)) in culture supernatant of lead-exposed (blood lead; Pb-B > 10 µg/dL) individuals with that of unexposed healthy controls (blood lead <10 µg/dL). The serum IgA level was significantly increased in lead-exposed individuals in comparison to controls (1829±53 versus 1389±52 µg/dL; (P <0.05). Furthermore, lipopolysaccharide-induced NO production by mouse macrophage cells, RAW 264.7, showed significant suppression (P<0.05) after treatment with lead acetate (100 ppm). This study suggested that lead could modulate the immune system by targeting the humoral as well as innate immune cells.

Key Words: lead • neutrophils • nitric oxide • super oxide

Human & Experimental Toxicology, Vol. 25, No. 11, 661-665 (2006)
DOI: 10.1177/0960327106070453
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