Involvement of somatolactin in background adaptation of the cichlid fish Cichlasoma dimerus

Somatolactin (SL) is a pituitary hormone present exclusively in fish that is involved in different physiological processes. The role of SL was evaluated in Cichlasoma dimerus (Teleostei, Perciformes) exposed for 10 days to a black and white background (BB and WB). Changes in α-melanophore stimulatin...

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Detalles Bibliográficos
Publicado: 2006
Materias:
Cichlasoma
Cichlidae
Perciformes
Teleostei
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15488969_v305_n5_p410_Canepa
http://hdl.handle.net/20.500.12110/paper_15488969_v305_n5_p410_Canepa
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_15488969_v305_n5_p410_Canepa
record_format dspace
spelling paper:paper_15488969_v305_n5_p410_Canepa2023-06-08T16:21:21Z Involvement of somatolactin in background adaptation of the cichlid fish Cichlasoma dimerus Cichlasoma Cichlidae Perciformes Teleostei Somatolactin (SL) is a pituitary hormone present exclusively in fish that is involved in different physiological processes. The role of SL was evaluated in Cichlasoma dimerus (Teleostei, Perciformes) exposed for 10 days to a black and white background (BB and WB). Changes in α-melanophore stimulating hormone (αMSH) and melanin concentrating hormone (MCH) cells were also analyzed for comparison with SL. A melanin dispersing effect was observed in fish exposed to a BB, while a concentrating one was observed in those exposed to a WB. By Western blot, three SL-immunoreactive (ir) bands (32, 28 and 23.5kD) were evidenced. Pituitary SL-ir levels were 2.66- and 2.67-fold greater in the 32 Kd and 28 kD bands, respectively, in BB fish compared with those of WB fish. The SL-ir 23.5 Kd band was not included in the analysis because of its unknown identity. In addition, SL-ir cell number and area were significantly higher in the BB condition (BB 22.73 ± 1.46, WB 7.37 ± 0.54 and BB 27.39 ± 1.00 μm2; WB: 16.61 ± 0.65 μm2). No significant differences were observed in the number of the hypothalamic MCH-ir neurons. However, a significant difference was observed in their nuclear area (BB 11.61 ± 0.42 μm2, WB 17.80 ± 0.84 μm 2). αMSH-ir cells showed a marked increased in number (BB 35.96 ± 1.22, WB 24.36 ± 1.04), but no significant differences were observed in the cell area. In conclusion, this study presented clear evidence towards a possible involvement of SL in the adaptation to background colors in teleost together with αMSH and MCH. © 2006 Wiley-Liss, Inc. 2006 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15488969_v305_n5_p410_Canepa http://hdl.handle.net/20.500.12110/paper_15488969_v305_n5_p410_Canepa
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cichlasoma
Cichlidae
Perciformes
Teleostei
spellingShingle Cichlasoma
Cichlidae
Perciformes
Teleostei
Involvement of somatolactin in background adaptation of the cichlid fish Cichlasoma dimerus
topic_facet Cichlasoma
Cichlidae
Perciformes
Teleostei
description Somatolactin (SL) is a pituitary hormone present exclusively in fish that is involved in different physiological processes. The role of SL was evaluated in Cichlasoma dimerus (Teleostei, Perciformes) exposed for 10 days to a black and white background (BB and WB). Changes in α-melanophore stimulating hormone (αMSH) and melanin concentrating hormone (MCH) cells were also analyzed for comparison with SL. A melanin dispersing effect was observed in fish exposed to a BB, while a concentrating one was observed in those exposed to a WB. By Western blot, three SL-immunoreactive (ir) bands (32, 28 and 23.5kD) were evidenced. Pituitary SL-ir levels were 2.66- and 2.67-fold greater in the 32 Kd and 28 kD bands, respectively, in BB fish compared with those of WB fish. The SL-ir 23.5 Kd band was not included in the analysis because of its unknown identity. In addition, SL-ir cell number and area were significantly higher in the BB condition (BB 22.73 ± 1.46, WB 7.37 ± 0.54 and BB 27.39 ± 1.00 μm2; WB: 16.61 ± 0.65 μm2). No significant differences were observed in the number of the hypothalamic MCH-ir neurons. However, a significant difference was observed in their nuclear area (BB 11.61 ± 0.42 μm2, WB 17.80 ± 0.84 μm 2). αMSH-ir cells showed a marked increased in number (BB 35.96 ± 1.22, WB 24.36 ± 1.04), but no significant differences were observed in the cell area. In conclusion, this study presented clear evidence towards a possible involvement of SL in the adaptation to background colors in teleost together with αMSH and MCH. © 2006 Wiley-Liss, Inc.
title Involvement of somatolactin in background adaptation of the cichlid fish Cichlasoma dimerus
title_short Involvement of somatolactin in background adaptation of the cichlid fish Cichlasoma dimerus
title_full Involvement of somatolactin in background adaptation of the cichlid fish Cichlasoma dimerus
title_fullStr Involvement of somatolactin in background adaptation of the cichlid fish Cichlasoma dimerus
title_full_unstemmed Involvement of somatolactin in background adaptation of the cichlid fish Cichlasoma dimerus
title_sort involvement of somatolactin in background adaptation of the cichlid fish cichlasoma dimerus
publishDate 2006
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15488969_v305_n5_p410_Canepa
http://hdl.handle.net/20.500.12110/paper_15488969_v305_n5_p410_Canepa
_version_ 1768544101007884288

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