TY - JOUR
T1 - The pineal complex, melatonin, and color change in the lamprey Lampetra
AU - Joss, Jean M P
PY - 1973
Y1 - 1973
N2 - Ammocoetes of Lampetra were found to display a diurnal color change rhythm which diminishes in intensity as the ammocoetes grow older and changes character after metamorphosis when the animals develop lateral eyes. The color change rhythm in the ammocoete can be abolished by hypophysectomy or pinealectomy and, in the metamorphosed animals, by hypophysectomy or removal of the lateral eyes. The pineals of paling ammocoetes contain a substance which is capable of aggregating the pigment in the melanophores of ammocoetes and of Xenopus laevis tadpoles (the latter being far more sensitive). The paling substance is very similar in action to the mammalian pineal hormone, melatonin, but synthetic melatonin, itself, has only a slight effect on ammocoete melanophores. However, melatonin was shown to have an antagonistic effect when administered to hypophysectomized ammocoetes in conjunction with melanophore-stimulating hormone.
AB - Ammocoetes of Lampetra were found to display a diurnal color change rhythm which diminishes in intensity as the ammocoetes grow older and changes character after metamorphosis when the animals develop lateral eyes. The color change rhythm in the ammocoete can be abolished by hypophysectomy or pinealectomy and, in the metamorphosed animals, by hypophysectomy or removal of the lateral eyes. The pineals of paling ammocoetes contain a substance which is capable of aggregating the pigment in the melanophores of ammocoetes and of Xenopus laevis tadpoles (the latter being far more sensitive). The paling substance is very similar in action to the mammalian pineal hormone, melatonin, but synthetic melatonin, itself, has only a slight effect on ammocoete melanophores. However, melatonin was shown to have an antagonistic effect when administered to hypophysectomized ammocoetes in conjunction with melanophore-stimulating hormone.
UR - http://www.scopus.com/inward/record.url?scp=0015838052&partnerID=8YFLogxK
U2 - 10.1016/0016-6480(73)90170-6
DO - 10.1016/0016-6480(73)90170-6
M3 - Article
C2 - 4724761
AN - SCOPUS:0015838052
SN - 0016-6480
VL - 21
SP - 188
EP - 195
JO - General and Comparative Endocrinology
JF - General and Comparative Endocrinology
IS - 1
ER -