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Effects of metal working fluids on B6C3F1 mouse skin.

Al-Humadi NH; Battelli L; Willard PA; Schwegler-Berry D; Castranova V; Kommineni C
Toxicol Ind Health 2000 Jul; 16(6):203-210
Over 10 million workers in the United States are exposed to metal working fluids (MWFs) through dermal contact and/or inhalation of aerosolized fluids. The objective of this study was to elucidate the response of skin to dermal exposure to MWFs. Four- to six-week-old B6C3F1 mice of both sexes were divided into eight groups (n=5/group) and exposed to 200 l of 0%, 5% (pH 7 and 9.7) and 100% (pH 10.4), unused MWFs/H2O by topical application to the unshaven back (cervical to sacral region), twice a week for 6 weeks. Skin-mast cell number in females of most treated groups and of two male groups (100% and 5%, pH 7) were significantly higher than the control groups. Eventhough both males and females (treated with 100% MWF/H2O) showed an increase in the skin-histamine levels (38% and 41%, respectively), this increase was significant in females only (ANOVA, P0.05). Dermal exposure to 100% MWFs increased liver weight significantly in both sexes. Ulcers and associated inflammation were seen in the skin of mice treated with 100% unused MWFs and sacrificed at 6 weeks, but not in the recovery groups. Hypertrophy of the sebaceous gland epithelium is present in all mice treated for 6 weeks and sacrificed immediately. However, only the mice treated with 100% MWF retained the hypertrophy of this epithelium after a 6-week recovery period. In conclusion, dermal exposure to unused semi-synthetic MWF penetrates the normal skin, induces mast cell accumulation in the skin, produces hypertrophy of the sebaceous glands, and may affect females more than males.
Metalworking; Metalworking fluids; Metalworking industry; Laboratory animals; Animals; Animal studies; Workers; Aerosols; Occupational exposure; Skin exposure; Demographic characteristics; Sex factors; Inhalation studies; Liver disorders; Author Keywords: histamine; kidney; liver; mast cells; metal working fluid; mice; skin; ulcer
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Journal Article
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NIOSH Division
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Toxicology and Industrial Health
Page last reviewed: June 15, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division