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The response of the newborn rat to injury. II. Histopathological aspects and mononuclearl cell turnover

✍ Scribed by C. J. Dunn; D. A. Willoughby

Publisher
John Wiley and Sons
Year
1975
Tongue
English
Weight
718 KB
Volume
116
Category
Article
ISSN
0022-3417

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✦ Synopsis

Histopathological investigations of skin lesions induced by subcutaneous implantation of glass coverslips were carried out in rats between birth and adulthood. Differences were found between the cellular reactions of newborn and adult rats to this irritant. An increased number of cells was found in the skin lesions of newborn rats, compared with adults. Uptake of a 30-min. pulse of tritiated thymidine by mononuclear cells was found to be higher in newborn skin lesions than in those of adult rats. The reverse was observed for the mononuclear cells adherent to implanted glass coverslips. Giant cells were less evident on coverslips removed from the skin of newborn rats.

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The development of oedema in response to irritants injected into the skin, or pleural cavity of rats, has been shown to differ according to the age of rat studied. It was found that newborn rats were less responsive, with respect to oedema formation, at certain times after the injection of a particu