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Adenylate cyclase in paraneurons. A histochemical study
Archivum Histologicum Japonicum = Nihon Soshikigaku Kiroku
|January 1, 1977
Summary
Adenylate cyclase activity was examined in hamster taste buds, duodenal EC cells, and adrenal medulla chromaffin cells. Positive activity suggests a role in stimulus reception for gustatory and gut endocrine cells.
Area of Science:
- Histochemistry
- Cell Biology
- Neuroendocrinology
Background:
- Adenylate cyclase is a key enzyme in cellular signaling pathways.
- Understanding its distribution in sensory and endocrine cells can elucidate their functions.
- Previous studies have not comprehensively mapped adenylate cyclase activity in these specific hamster tissues.
Purpose of the Study:
- To histochemically investigate adenylate cyclase activity in hamster taste buds, duodenal EC cells, and adrenal medulla chromaffin cells.
- To differentiate activity patterns based on cell type and substrate used (AMP-PNP vs. ATP).
- To correlate enzyme activity with potential roles in stimulus reception.
Main Methods:
- Histochemical examination of adenylate cyclase activity using Wagner's method (1972).
- Substrate utilization with Adenosine Monophosphate-Polyphosphate (AMP-PNP) and Adenosine Triphosphate (ATP).
- Microscopic analysis of reaction product distribution in taste bud cells, duodenal EC cells, and adrenal chromaffin cells.
Main Results:
- Intense adenylate cyclase activity observed along microvilli of taste bud cells with AMP-PNP; weaker activity on lateral membranes. ATP showed even distribution, except in synaptic areas.
- Duodenal EC cells exhibited intense microvillar activity with AMP-PNP. ATP resulted in stronger microvillar than lateral membrane activity.
- Adrenal chromaffin cells showed minimal AMP-PNP activity. ATP revealed intense reactions on Schwann cell and axon membranes, with slight activity on chromaffin cell membranes; synaptic areas were negative.
Conclusions:
- Positive adenylate cyclase activity in gustatory and gut endocrine cells suggests a role in stimulus reception.
- Lack of significant adenylate cyclase activity in adrenal medulla chromaffin cells, which are in the internal milieu, supports their distinct signaling mechanisms.