Document Detail


Developmental toxicity of inhaled N-methylformamide in the rat.
MedLine Citation:
PMID:  8835226     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The developmental toxicity of N-methylformamide (MMF), an industrial chemical intermediate used in the production of agrichemicals, was examined in pregnant rats. MMF was administered by nose-only inhalation, 6 hr daily on Days 7-16 of gestation (the day copulation was confirmed was termed Day 1 of gestation, Day 1G) at exposure concentrations of 0, 15, 50, or 150 ppm. Dams were regularly monitored throughout gestation for body weight gain, feed consumption, and clinical signs. Cesarean sections were performed on Day 22G and the offspring were examined. Maternal toxicity was evident in dams exposed to 50 or 150 ppm; one dam exposed to 150 ppm died on Day 14G (considered to be treatment-related) and dams in the 50 and 150 ppm groups exhibited concentration-related clinical findings. Clinical signs of wheezing and rattling were observed both during and after the exposure period. The 150 ppm group also showed significant decreases in weight gain and feed consumption. A significant increase in the mean number of resorptions per litter at the 150 ppm level indicated an embryolethal effect. Developmental toxicity was apparent by a significant decrease in mean fetal body weight and increases in fetal malformations (subcutaneous cysts on the head, microphthalmia, anophthalmia, fused ribs and/or vertebra, and distended brain ventricles) and variations (misaligned and fused sternebrae) due to retarded development at 150 ppm. Significant fetal body weight decreases were also present at 50 ppm. Thus, in this study, the no-observable-adverse-effect level for both dam and fetus was 15 ppm MMF, indicating that for the parameters included in this study, the conceptus is not uniquely sensitive to MMF.
Authors:
L B Rickard; C D Driscoll; G L Kennedy; R E Staples; R Valentine
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Fundamental and applied toxicology : official journal of the Society of Toxicology     Volume:  28     ISSN:  0272-0590     ISO Abbreviation:  Fundam Appl Toxicol     Publication Date:  1995 Dec 
Date Detail:
Created Date:  1996-12-04     Completed Date:  1996-12-04     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8200838     Medline TA:  Fundam Appl Toxicol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  167-76     Citation Subset:  IM    
Affiliation:
Haskell Laboratory for Toxicology and Industrial Medicine, E. I. du Pont de Nemours and Company, Newark, Delaware 19714, USA.
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MeSH Terms
Descriptor/Qualifier:
Administration, Inhalation
Animals
Body Weight / drug effects
Embryonic and Fetal Development / drug effects*
Female
Fetus / abnormalities
Formamides / administration & dosage,  toxicity*
Liver / drug effects
Male
No-Observed-Adverse-Effect Level
Organ Size / drug effects
Rats
Reproduction / drug effects
Thymus Gland / drug effects
Chemical
Reg. No./Substance:
0/Formamides; 123-39-7/methylformamide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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