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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todo:paper_15488969_v305_n5_p410_Canepa2023-10-03T16:23:13Z Involvement of somatolactin in background adaptation of the cichlid fish Cichlasoma dimerus Cánepa, M.M. Pandolfi, M. Maggese, M.C. Vissio, P.G. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 Cánepa, M.M. Pandolfi, M. Maggese, M.C. Vissio, P.G. 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. |
| format |
JOUR |
| author |
Cánepa, M.M. Pandolfi, M. Maggese, M.C. Vissio, P.G. |
| author_facet |
Cánepa, M.M. Pandolfi, M. Maggese, M.C. Vissio, P.G. |
| author_sort |
Cánepa, M.M. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_15488969_v305_n5_p410_Canepa |
| work_keys_str_mv |
AT canepamm involvementofsomatolactininbackgroundadaptationofthecichlidfishcichlasomadimerus AT pandolfim involvementofsomatolactininbackgroundadaptationofthecichlidfishcichlasomadimerus AT maggesemc involvementofsomatolactininbackgroundadaptationofthecichlidfishcichlasomadimerus AT vissiopg involvementofsomatolactininbackgroundadaptationofthecichlidfishcichlasomadimerus |
| _version_ |
1782028394924343296 |