Alteration by ouabain of rat submandibular glands function

Area of Science:

• Salivary Gland Physiology
• Pharmacology
• Biochemistry

Background:

• The submandibular gland plays a crucial role in saliva production, influencing electrolyte and protein composition.
• Ouabain, a cardiac glycoside, is known to affect ion transport mechanisms in various cells.

Purpose of the Study:

• To investigate the effects of different intraperitoneal doses of ouabain (1, 2, and 5 mg/kg) on rat submandibular saliva.
• To determine the impact of ouabain on salivary electrolyte (potassium, calcium) and protein concentrations.
• To explore the relationship between salivary flow rate and electrolyte alterations induced by ouabain.

Main Methods:

• Administration of varying doses of ouabain intraperitoneally to rats.
• Collection and analysis of submandibular saliva.
• Measurement of potassium, calcium, magnesium, and total protein concentrations in saliva.

Main Results:

• Elevated levels of potassium, calcium, and their product (K+ x Ca2+) were observed across all ouabain dose groups.
• Salivary flow rate changes did not significantly account for the observed electrolyte alterations.
• Protein concentrations increased at 1 and 2 mg/kg ouabain doses, and remained elevated above baseline at 5 mg/kg.
• A close parallelism was found between magnesium and total protein secretion in response to ouabain.

Conclusions:

• Ouabain administration significantly alters the electrolyte and protein composition of rat submandibular saliva.
• The observed changes in electrolytes are likely a direct effect of ouabain on the gland, not secondary to changes in salivary flow.
• Ouabain induces a dose-dependent parallelism between magnesium and total protein secretion, suggesting a coordinated secretory response.