Staining Secretory Capillaries of Exocrine Glands with Techniques for Specific Phosphatases

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Abstract
Intercellular secretory capillaries in parotid glands, eccrine sweat glands and intracellular secretory capillaries in parietal cells of gastric glands were demonstrated histo-chemically by the use of the Wachstein-Meisel adenosinetriphosphatase (ATPase) technique in the rabbit, rat and guinea pig. However, with the Wachstein-Meisel 5-nucleotidase technique, secretory capillaries were not stained. For parotid glands, optimal incubation in ATPase substrate mixture was: in rabbit, 15 min; in rat, 2.5 hr; and in guinea pig, 2 hr. For eccrine sweat glands, optimal incubation was 15 min in rabbit, 30 min in rat and 15 min in guinea pig. For parietal cells of gastric glands, optimal incubation was 3 hr for all three species. Secretory capillaries were best demonstrated in the parotid by using rabbit tissue; in eccrine sweat glands, with rat tissue, and in parietal cells, guinea pig tissue. Since ATPase activity in cell membranes of secretory cells may play a part in the mechanism of transport of secretory products from their place of formation in the acini to the excretory ducts, the Wachstein-Meisel ATPase technique can therefore be used successfully for staining secretory capillaries in many of the exocrine glands of laboratory mammals.

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