Rezaian M, Yamashiro S, Hardy MH, Bettger WJ. Mechanism of recovery in esophageal epithelia of rats with severe zinc deficiency.
ZENTRALBLATT FUR VETERINARMEDIZIN. REIHE A 1994;
41:690-9. [PMID:
7732747 DOI:
10.1111/j.1439-0442.1994.tb00137.x]
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Abstract
Forty-six rats fed a Zn-deficient diet for 18 days, were divided into three groups and treated with Zn-deficient diet (GI), a normal (Zn-adequate) diet (GII) or a pharmacological Zn therapy diet (GIII) for 3 days. For light and electron microscopy, samples were taken at times 0, 8, 12, 24 and 72 h after treatment. In treatment GI, at all times, all rats had esophageal parakeratosis. With treatment GII, there was a variable progression toward normalization of the epithelium at 12 and 24 h. At 72 h there was almost complete recovery of normal epithelium. In treatment GIII at 8 h, large, light cells in the basal layer were shown to be present between dark cylindrical cells, a finding which was transitionary and disappeared at 12 h. Also, a thin keratinized layer was observed above the granular layer at 12 h. Recovery had progressed at 24 h and was complete after 72 h. The results are discussed in terms of a potential role of Zn in the sequence of cytochemical events in epithelial differentiation.
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