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Natriuretic peptide system in the rat submaxillary gland
M Jankowski1, C Petrone, J Tremblay
1Laboratory of Cardiovascular Biochemistry, Centre de Recherche Hôtel-Dieu de Montréal, Quebec, Canada.
Regulatory Peptides
|April 9, 1996
Summary
Rat submaxillary glands synthesize natriuretic peptides, including atrial natriuretic peptide (ANP) and C-type natriuretic peptide (CNP). These glands also express natriuretic peptide receptors, suggesting a functional role.
Area of Science:
- Endocrinology
- Molecular Biology
- Physiology
Background:
- Natriuretic peptides (NPs) are crucial regulators of cardiovascular and renal functions.
- Their presence and function in salivary glands, specifically rat submaxillary glands (SGs), remain largely uncharacterized.
Purpose of the Study:
- To investigate the presence and potential synthesis of natriuretic peptides and their receptors in rat submaxillary glands.
- To determine the functional implications of these findings in SG physiology.
Main Methods:
- Extraction and characterization of peptides using reverse-phase high-performance liquid chromatography (HPLC).
- Detection of messenger RNA (mRNA) for ANP via molecular biology techniques.
- Quantification of ANP and C-type natriuretic peptide (CNP) levels.
- Assessment of guanylyl cyclase and clearance receptor expression.
Main Results:
- Rat SGs contain both atrial natriuretic peptide (ANP) prohormone and mature ANP, indicating local synthesis.
- ANP mRNA was detected in SGs, albeit at lower levels than in the lung or hypothalamus.
- C-type natriuretic peptide (CNP) was found in SGs at significantly higher concentrations than in lung tissue.
- Both guanylyl cyclase and clearance receptors for NPs were expressed in rat SGs.
Conclusions:
- Rat submaxillary glands are a site for the synthesis of natriuretic peptides (ANP and CNP).
- The expression of NP transcripts and their cognate receptors suggests a potential role for natriuretic peptides in regulating rat SG functions.