Prevention of Paraquat Toxicity in Suspensions of Alveolar Type II Cells by Paraquat-Specific Antibodies

Chen N., Bowles M.R. and Pond S.M. (1994) Prevention of Paraquat Toxicity in Suspensions of Alveolar Type II Cells by Paraquat-Specific Antibodies. Human & Experimental Toxicology, 13 8: 551-557. doi:10.1177/096032719401300808


Author Chen N.
Bowles M.R.
Pond S.M.
Title Prevention of Paraquat Toxicity in Suspensions of Alveolar Type II Cells by Paraquat-Specific Antibodies
Journal name Human & Experimental Toxicology   Check publisher's open access policy
ISSN 1477-0903
Publication date 1994
Sub-type Article (original research)
DOI 10.1177/096032719401300808
Volume 13
Issue 8
Start page 551
End page 557
Total pages 7
Subject 3005 Toxicology
2307 Health, Toxicology and Mutagenesis
Abstract 1 The herbicide, paraquat, is accumulated by the energy-dependent polyamine uptake pathway of alveolar type I.I. cells. There it undergoes redox cycling that results in an amplified production of toxic reactive oxygen species and depletion of NADPH and other reducing equivalents. These processes account for the lung being the major target organ for paraquat toxicity. 2 We postulated that paraquat-specific antibodies would inhibit the uptake of the herbicide by type I.I. cells and prevent its toxicity. Accordingly, we examined the effects of paraquat-specific monoclonal antibodies and Fab fragments on the uptake, efflux and cytotoxicity of 50 μM paraquat in suspensions of alveolar type I.I. cells isolated from the rat. 3 The uptake of paraquat was linear over 40 min. Over this time, the uptake rate was inhibited significantly (% inhibition, 73-89) by IgG (25 or 50 μM) or Fab fragments (50 or 100 μM). 4 The apparent efflux rate of paraquat, studied over 16 h, was increased significantly from 0.12 h-1 for the control cells in medium to 0.17 h-1 by paraquat-specific Fab fragments but was unaffected by the specific IgG. 5 Cytotoxicity was determined by measuring the release of 51Cr from the cells. The cytotoxicity of 50 μM paraquat was decreased significantly (percent decrease, 56-80%) in the presence of specific antibodies. 6 These studies in vitro suggest some potential for immunotherapy in selected cases of paraquat poisoning.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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