Water regulation by a presumptive hormone contained in identified neurosecretory cell R15 of Aplysia.
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Water regulation by a presumptive hormone contained in identified neurosecretory cell R15 of Aplysia
Injection of an homogenate of identified neuron R15 into the hemocele of Aplysia produced a weight increase of 3-10% within 90 min. Control injections of several other identified neurons or of seawater, were ineffective. The weight increase occurred even when the animals were maintained in 5% hyperosmotic seawater. The activity of the R15 homogenate was retained after acidification to pH 2 and ...
متن کاملPurification and sequencing of neuropeptides contained in neuron R15 of Aplysia californica.
R15 is a large identified neuron present in the abdominal ganglion of the mollusc Aplysia. Previous studies have indicated that this neuron may play a role in water balance and possibly renovascular functions. A peptidic factor contained in the neuron R15 has been shown to increase the water content of Aplysia. To determine the structure of the peptides contained in R15, we purified the extract...
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The purpose of the study described in this and the following two companion papers was to determine the synaptic actions of neuron R15, an endogenously bursting neurosecretory cell in Aplysia, as a step toward determining its physiological function. The results described in this paper demonstrate that activity in R15 increases the frequency of bursting in the R25/L25 network that triggers respir...
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The purpose of this study was to determine the synaptic actions of the bursting peptidergic neuron R15 in Aplysia. R15 is known to be excited by the neuroendocrine bag cells, which trigger egg laying. In the two companion papers, we show that R15 mediates some of the effects of the bag cells on respiratory and reproductive organs. In this paper, we demonstrate that R15 excites L7, a multimodal ...
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In the moth Manduca sexta, the declining ecdysteroid titer on the final day of the molt from the fourth to the fifth larval instar acts on the ventromedial neurosecretory cells (VM cells) to stimulate the release of eclosion hormone (EH). EH then triggers the motor programs involved in ecdysis behavior. Intracellular recordings that were made from the VM cells throughout the intermolt and molti...
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1976
ISSN: 0022-1295,1540-7748
DOI: 10.1085/jgp.67.1.113