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Skin ultrastructure in relation to prolactin and MSH function in rainbow trout (Oncorhynchus mykiss) exposed to environmental acidification

Balm, P.H.M.; Iger, Y.; Prunet, P.; Pottinger, T.G.; Wendelaar Bonga, S.E.. 1995 Skin ultrastructure in relation to prolactin and MSH function in rainbow trout (Oncorhynchus mykiss) exposed to environmental acidification. Cell and Tissue Research, 279 (2). 351-358. 10.1007/BF00318491

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Abstract/Summary

The present study describes the effects of 14 days exposure to acidified (pH 4.0) soft water in the absence of aluminium, on the ultrastructure of the skin in rainbow trout (Oncorhynchus mykiss). Compared to control fish, there was a moderate increase in the incidence of necrosis in the filament cells of the fish exposed to pH 4.0, but since the integrity of the tissue appeared to be maintained, most of the ultrastructural changes observed may be considered to be adaptive. There was an increase in epidermal thickness, a higher frequency of electrondense vesicles in filament cells, an increase in the undulation of the basal lamina, and the penetration of the epidermis by cytoplasmatic processes of melanocytes in acid-exposed specimens. An infiltration of leucocytes into the epidermis, and the appearance of serous mucous cells, was also evident. Whether these events were under the control of prolactin and/or α-MSH, was also investigated, but no indication for activation or inhibition of either prolactin or α-MSH producing cells was obtained. Since a previous study (Balm and Pottinger 1993) had demonstrated that plasma cortisol levels were also identical in control and low pH treated trout throughout a 14 day experimental period, it is concluded that under conditions of environmental acidification, the integument autonomically maintains the adjustments necessary for successful acclimation, presumably via paracrine regulatory circuits.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1007/BF00318491
CEH Sections: _ Pre-2000 sections
ISSN: 0302-766X
Additional Keywords: skin, acidification, prolactin, MSH, melanocytes, Oncorhynchus mykiss, mucous cells, leucocytes
NORA Subject Terms: Zoology
Biology and Microbiology
Date made live: 03 Aug 2015 10:23 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/510973

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