Natriuretic peptide system in the rat submaxillary gland.
Natriuretic peptides and their receptors were characterized in rat submaxillary glands (SGs). Reverse phase-high performance liquid chromatography (HPLC) of rat SGs extracts revealed the presence of the 28-amino-acid (AA) circulating peptide ANP (Ser99-Tyr126) and the 126-AA prohormone (Asn1-Tyr126). The presence of ANP prohormone indicated that SGs are a site of ANP synthesis. Indeed, ANP mRNAs were demonstrated. ANP mRNA was 10 times lower than in the lung and only about 7 times lower than in the hypothalamus. ANP content in SG was determined as 30 +/- 8 ng/mg of protein (n = 7). In addition the presence of another member of the natriuretic peptide family, C-type natriuretic peptide (CNP), was found in SG. The CNP level of 293 +/- 38 pg/mg protein was significantly higher than in the lungs (44 +/- 6 pg/mg protein, P < 0.001, n = 5), but about 15 times lower than in hypothalamus (4.5 +/- 0.6 ng/mg protein, P < 0.001, n = 6). Both guanylyl cyclase and clearance receptors were expressed in SG. The presence of natriuretic peptide transcripts and their receptors suggests a role in rat SG functions.
Jankowski
M
M
Laboratory of Cardiovascular Biochemistry, Centre de Recherche Hôtel-Dieu de Montréal, Quebec, Canada.
Petrone
C
C
Tremblay
J
J
Gutkowska
J
J
D000818:Animals; D009320:Atrial Natriuretic Factor / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D001483:Base Sequence; D002851:Chromatography, High Pressure Liquid; D005260:Female; D007031:Hypothalamus / Q000378:metabolism; D008969:Molecular Sequence Data; D020098:Natriuretic Peptide, C-Type; D016133:Polymerase Chain Reaction; D011506:Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D017461:Receptors, Atrial Natriuretic Factor / Q000235:genetics / Q000378:metabolism; D013363:Submandibular Gland / Q000378:metabolism*; D014158:Transcription, Genetic / Q000235:genetics
D011506:Proteins; D012333:RNA, Messenger; D020098:Natriuretic Peptide, C-Type; D009320:Atrial Natriuretic Factor; D017461:Receptors, Atrial Natriuretic Factor