Atrial natriuretic factor negatively modulates secretin intracellular signaling in the exocrine pancreas

Maria Eugenia Sabbatini, Marcelo S. Vatta, Carlos A. Davio, Liliana G. Bianciotti

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

We previously reported that atrial natriuretic factor (ANF) stimulates pancreatic secretion through NPR-C receptors coupled to PLC and potentiates secretin response without affecting cAMP levels. In the present study we sought to establish the intracellular signaling mechanism underlying the interaction between both peptides. In isolated pancreatic acini 100 nM ANF abolished cAMP accumulation evoked by any dose of secretin. Lower doses of ANF (1 fM, 1 pM, 1 and 10 nM) dose dependently reduced EC50 secretin-evoked cAMP. Although ANF failed to affect cAMP stimulated by amthamine (selective H2 agonist) or isoproterenol (β-adrenergic agonist), it abolished VIP-induced cAMP formation. ANF inhibitory effect was prevented by U-73122 (PLC inhibitor) and GF-109203X (PKC inhibitor) but unaltered by PKG and nitric oxide synthase inhibition, supporting that the PLC/PKC pathway mediated the effect. ANF response was mimicked by cANP (4-23 amide) and abolished by pertussis toxin, strongly supporting NPR-C receptor activation. In vivo studies showed that ANF at 0.5 μg·kg-1·h-1 enhanced secretion stimulated by 1 U·kg-1·h-1 secretin but at 1 and 2 μg·kg-1·h-1 it abolished secretin response. However, ANF at such doses failed to modify the secretion evoked by carbachol or CCK. Present results show that ANF negatively modulated secretin secretory response and intracellular signaling through the activation of NPR-C receptors coupled to the PLC/PKC pathway. Furthermore, the finding that ANF also inhibited VIP-evoked cAMP supports a selective modulation of class II G-protein coupled receptors by ANF. Present findings suggest that ANF may play a protective role by reducing secretin response to avoid overstimulation.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Gastrointestinal and Liver Physiology
Volume292
Issue number1
DOIs
StatePublished - Jan 1 2007
Externally publishedYes

Fingerprint

Exocrine Pancreas
Secretin
Atrial Natriuretic Factor
Histamine Agonists
Adrenergic Agonists
Pertussis Toxin
Carbachol
G-Protein-Coupled Receptors
Isoproterenol
Amides
Nitric Oxide Synthase

Keywords

  • Adenosine 3′,5′-cyclic monophosphate
  • Pancreatic flow
  • Phospholipase C
  • Protein kinase C

ASJC Scopus subject areas

  • Physiology
  • Hepatology
  • Gastroenterology
  • Physiology (medical)

Cite this

Atrial natriuretic factor negatively modulates secretin intracellular signaling in the exocrine pancreas. / Sabbatini, Maria Eugenia; Vatta, Marcelo S.; Davio, Carlos A.; Bianciotti, Liliana G.

In: American Journal of Physiology - Gastrointestinal and Liver Physiology, Vol. 292, No. 1, 01.01.2007.

Research output: Contribution to journalArticle

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