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• W2020049303 abstract "Dimethyl sulphoxide (DMSO) was tested for oral toxicity in rats and dogs, and dermal toxicity in rabbits and pigs. Oral administration was by gastric intubation as a 50% aqueous solution, 5 days/week at levels equivalent to 9.0, 3.0 or 1.0 ml undiluted DMSO/kg/day. For dermal application 50% and 90% aqueous solutions were used to give levels equivalent to 8.1, 4.5, 2.7 or 1.5 ml DMSO/kg/day, as one daily application for rabbits, and divided into two applications/day for pigs. Dogs were dosed for approximately 2 years and pigs for 1 year, although half the animals of both species were dosed for only 18 weeks. Rats were dosed for 18 months, but some were used for interim sacrifice after a year. Rabbits received applications to normal and abraded skin for 6 months. Minor changes in bodyweight and haematological values were observed, together with a physiological diuretic response to DMSO, but the target organ was the eye, principally the lenticular nucleus. Ocular effects in dogs started after 5–10 weeks dosing at 9 ml/kg and consisted of central (nuclear) lens changes with alteration of the refractive index (myopia); transitory equatorial opacities during the 5th month; central (nuclear) opalescence; and changes in the vitreous humour. Similar changes occurred more slowly at 3 ml/kg, the alterations to the vitreous being first observed after 9–10 months at this level. Progressive nuclear refractive changes occurred after dosing for considerably longer than 6 months at 1 ml/kg, but none of the animals in this group manifested the opalescence. Biochemical investigation of the lenses revealed reduction of soluble protein (mainly α-crystallin), glutathione and water levels, and an increase of insoluble protein. Evidence of recovery was limited mainly to a reduction in the number of dioptres needed to correct nuclear refractive change. Cessation of dosing led to regression of refractive nuclear changes but did not prevent the appearance of opalescence at 3 ml/kg and above. Dogs were the most severely affected of the 4 species, with nuclear effects at 1 ml/kg, extensive changes in the lens, and involvement of the vitreous. Pigs and rabbits were affected by dose levels of 2.7 ml/kg and 1.5 ml/kg respectively. Rats occasionally showed minimal changes at 9 ml/kg. The importance of the findings in dogs is discussed in relation to general toxicology protocols. It is emphasised that reversibility of signs, and adequate duration of administration, must both be considered when ascertaining whether changes occur at levels approximating to those of human intake." @default.
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• W2020049303 date "1975-02-01" @default.
• W2020049303 modified "2023-09-26" @default.
• W2020049303 title "The toxicity of dimethyl sulphoxide (DMSO) for the dog, pig, rat and rabbit" @default.
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• W2020049303 doi "https://doi.org/10.1016/0300-483x(75)90081-5" @default.
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