Beta2-adrenoceptors mediate melanosome dispersion in winter flounder (Pleuronectes americanus)

被引:13
作者
Mayo, DJ [1 ]
Burton, D
机构
[1] Mem Univ Newfoundland, Dept Biol, St Johns, NF A1B 3X9, Canada
[2] Mem Univ Newfoundland, Ctr Ocean Sci, St Johns, NF A1B 3X9, Canada
来源
CANADIAN JOURNAL OF ZOOLOGY-REVUE CANADIENNE DE ZOOLOGIE | 1998年 / 76卷 / 01期
关键词
D O I
10.1139/cjz-76-1-175
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
Although the melanosome-aggregaling mediation of catecholamines through a-adrenoceptors is well established for teleost melanophores, the regulation of the dispersive process is not as clearly understood. The melanosome-aggregating effect of high concentrations of catecholamines in vitro is reversed at low concentrations with melanophores of the winter flounder, Pleuronectes americanus. In vitro incubation in low concentrations of isoproterenol (less than or equal to 10(-7) M) and noradrenaline (less than or equal to 10(-8) M) enhances Na+-induced melanosome dispersion in balanced salt solution, which can be depressed by propranolol (10(-4) M), indicating beta-adrenoceptor mediation in pigment dispersion. The subtype of this adrenoceptor appears to be the beta(2) conformation, since the beta(2)-adrenoceptor agonist terbutaline (greater than or equal to 3.15 x 10(-6) M) reverses the melanosome-aggregating effect associated with higher concentrations of noradrenaline and with electrical stimulation. It is concluded that in this species there is adrenergic neuronal control of melanosome aggregation through cc-adrenoceptors on release of noradrenaline and of dispersion through beta(2)-adrenoceptors during a subsequent decrease in concentration.
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页码:175 / 180
页数:6
相关论文
共 31 条
[1]   A STUDY OF THE ADRENOTROPIC RECEPTORS [J].
AHLQUIST, RP .
AMERICAN JOURNAL OF PHYSIOLOGY, 1948, 153 (03) :586-600
[2]   ADRENERGIC-NERVES AND THE ALPHA-2-ADRENOCEPTOR SYSTEM REGULATING MELANOSOME AGGREGATION WITHIN FISH MELANOPHORES [J].
ANDERSSON, RGG ;
KARLSSON, JO ;
GRUNDSTROM, N .
ACTA PHYSIOLOGICA SCANDINAVICA, 1984, 121 (02) :173-179
[3]  
[Anonymous], 1876, DFR, P1
[4]   ADRENOCEPTORS IN CRYPTIC PATTERNING OF A FLATFISH, PLEURONECTES-AMERICANUS [J].
BURTON, D ;
VOKEY, J ;
MAYO, D .
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, 1995, 261 (1361) :181-186
[5]  
BURTON D, 1985, J EXP BIOL, V114, P649
[6]   A CELLULAR ANALYSIS OF CHROMATOPHORE PATTERNING IN WINTER FLOUNDER (PSEUDOPLEURONECTES-AMERICANUS WALBAUM) [J].
BURTON, D .
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY, 1980, 67 (03) :453-457
[7]   PHYSIOLOGICAL-RESPONSES OF MELANOPHORES AND XANTHOPHORES OF HYPOPHYSECTOMIZED AND SPINAL WINTER FLOUNDER, PSEUDOPLEURONECTES-AMERICANUS WALBAUM [J].
BURTON, D .
PROCEEDINGS OF THE ROYAL SOCIETY SERIES B-BIOLOGICAL SCIENCES, 1981, 213 (1191) :217-231
[8]   ADRENERGIC NERVES TO DERMAL MELANOPHORES OF RAINBOW TROUT, SALMO GAIRDNERI [J].
FALCK, B ;
MUNTZING, J ;
ROSENGREN, AM .
ZEITSCHRIFT FUR ZELLFORSCHUNG UND MIKROSKOPISCHE ANATOMIE, 1969, 99 (03) :430-+
[9]   RECEPTOR MECHANISMS IN FISH CHROMATOPHORES .1. ALPHA-NATURE OF ADRENOCEPTORS MEDIATING MELANOSOME AGGREGATION IN GUPPY MELANOPHORES [J].
FUJII, R ;
MIYASHITA, Y .
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-PHARMACOLOGY TOXICOLOGY & ENDOCRINOLOGY, 1975, 51 (02) :171-178
[10]  
FUJII R, 1986, ZOOL SCI, V3, P13