A Potential Treatment of Congenital Sodium Diarrhea in Patients With Activating GUCY2C Mutations

Anke H.M. van Vugt, Marcel J.C. Bijvelds, Hugo R. de Jonge, Kelly F. Meijsen, Tanja Restin, Manuel B. Bryant, Antje Ballauff, Bart Koot, Thomas Müller, Roderick H.J. Houwen, Andreas R. Janecke*, Sabine Middendorp

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)
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INTRODUCTION: Gain-of-function mutations in guanylyl cyclase C (GCC) result in persistent diarrhea with perinatal onset. We investigated a specific GCC inhibitor, SSP2518, for its potential to treat this disorder. METHODS: We investigated the effect of SSP2518 on GCC-mediated intracellular cyclic guanosine monophosphate (cGMP) levels and on GCC-mediated chloride secretion in intestinal organoids from 3 patients with distinct activating GCC mutations and from controls, with and without stimulation of GCC with heat-stable enterotoxin. RESULTS: Patient-derived organoids had significantly higher basal cGMP levels than control organoids, which were lowered by SSP2518 to levels found in control organoids. In addition, SSP2518 significantly reduced cGMP levels and chloride secretion in patient-derived and control organoids (P < 0.05 for all comparisons) after heat-stable enterotoxin stimulation. DISCUSSION: We reported in this study that the GCC inhibitor SSP2518 normalizes cGMP levels in intestinal organoids derived from patients with GCC gain-of-function mutations and markedly reduces cystic fibrosis transmembrane conductance regulator-dependent chloride secretion, the driver of persistent diarrhea.

Original languageEnglish
Article numbere00427
JournalClinical and Translational Gastroenterology
Issue number11
Publication statusPublished - 18 Nov 2021

Bibliographical note

Financial support: This work was supported by Grant NWOZonMW-VIDI 016.146.353 to S.M.

Publisher Copyright:
Copyright © 2021 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of The American College of Gastroenterology.


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