Differential Melanin‐Concentrating Hormone Gene Expression in Two Hypothalamic Nuclei of the Teleost Tilapia in Response to Environmental Changes

Gröneveld, D.; Balm, P.H.M.; Martens, Gerard J.M.; Bonga, S.E. Wendelaar

doi:10.1111/j.1365-2826.1995.tb00789.x

Cited by 36 publications

(30 citation statements)

References 32 publications

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“…Other reports have focused on the effects of environmental color on behavior (4,5,16), growth and survival (6). Effects of color background on chromatophore-regulating hormones have also been reported and Groneveld et al (17) found that the response of the melanin-concentrating hormone to background color is not strictly related to the pituitary-interrenal axis in tilapia. However, the present study supports the idea that color influences this axis, thus showing that color may affect different biological systems.…”

mentioning

confidence: 97%

Environmental blue light prevents stress in the fish Nile tilapia

Volpato

Barreto

2001

Braz J Med Biol Res

154

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The present study aimed to test the effects of blue, green or white light on the stress response of the Nile tilapia, Oreochromis niloticus (L.). Each color was tested on two groups of isolated adult Nile tilapia (8 replicates each): one being subjected to confinement stress, and the other not (control). A different environmental color was imposed on each compartment by covering the light source with cellophane of the respective color (green or blue; no cellophane was used for white light). The intensity of green, white and blue lights was 250, 590 and 250 lux, respectively. Basal plasma cortisol levels were determined for each fish prior to the experimental procedures. The fish were confined by being displaced toward one side of the aquarium using an opaque partition for 1 h both in the morning and the afternoon of the two consecutive days of the test. At the end of this 48-h period, plasma cortisol levels were measured again. Basal cortisol levels (ng/ml) were similar for each group (ANOVA, F (2;42) = 0.77, P = 0.47). Thus, plasma cortisol levels were analyzed in terms of variation from their respective basal level. After confinement, plasma cortisol levels were not increased in fish submitted to a blue light environment. Thus, blue light prevents the confinement-induced cortisol response, an effect not necessarily related to light intensity.

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confidence: 97%

Environmental blue light prevents stress in the fish Nile tilapia

Volpato

Barreto

2001

Braz J Med Biol Res

154

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“…It was proposed that MCH-ir neuronal somata were located only in the NLT from which axons projected to the pituitary, and that their synthetic activity was altered in response to the color of the environment Gröneveld et al 1995b;Suzuki et al 1995). However, a second group of parvocellular MCH neuronal somata has also been identified in the dorsal hypothalamus, located in the area above the LVR in the rainbow trout.…”

Section: Distribution Of Mch Neurons In the Brainmentioning

confidence: 99%

Multifunctional Roles of Melanocyte-Stimulating Hormone and Melanin-Concentrating Hormone in Fish: Evolution from Classical Body Color Change

Takahashi¹,

Mizusawa²,

Amano³

2014

Aqua-BioSci. Monogr. (ABSM)

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The representative role of melanocyte-stimulating hormone (MSH) and melaninconcentrating hormone (MCH) in fish is regulation of pigment migration. However, our studies using barfin flounder Verasper moseri, a flatfish as a major experimental fish, have revealed that MSH and MCH are multifunctional because their receptors are widely distributed not only in the melanophores but also in the brain and systemic body. Their biological roles other than control of pigment migration would be regulation of feeding behavior, energy metabolism, cortisol release, etc. Among them, an interesting biological process on molecular level has been observed in the role of α-MSH. A fine difference in the structure-presence or absence of one acetyl group-modified the activities. Namely, desacetyl-α-MSH having no acetyl group at N-terminal stimulates pigment dispersion in melanophore and cortisol release from the interrenal gland, while α-MSH having one acetyl group has negligible effects. On the whole body level, MCH probably transfers information about photic conditions from the external environment to the body. MCH production is changeable, depending on the difference in the intensity of the light. A white background enhances production of MCH, and MCH turns body color pale by aggregating pigments in scales. It is suggested that this peptide stimulates feeding behavior. This monograph reveals molecular characteristic and biological significance of MSH and MCH systems in fish.

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“…The finding that MCH interacts with the a-MSH cell not only has implications for our understanding of the roles of both cell types in background adaptation, but probably also for their func tions in the response to stressors. In tilapia, both cell types are responsive to acidification as a stressor ( 17,24), and in trout MCH secretion and biosynthesis are affected during injection and dis turbance stress (6,15).…”

Section: Effects Of Mch On the Release Of A-msh Isoformsmentioning

confidence: 99%

“…The antiserum is equally sensitive to des-, mono-and diacetyl a-MSH. Cross-reac tivity of the a-MSH antiserum with MCH [preliminary results have been reported by De Koning et al (13)] and MCH (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17) was assessed (see the Results section).…”

Section: A-msh Radioimmunoassaymentioning

confidence: 99%