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MIRAVA POLYSCOPE – All in one and on for all: the perfect image
Science beyond Barriers

abberior instruments

Physiology

2023
The Journal of Clinical Investigation

Patient-derived Enteroids provide a Platform for the Development of Therapeutic Approaches in Microvillus Inclusion Disease

Authors:

Meri Kalashyan, Krishnan Raghunathan, Haley Oller, Marie-Theres Bayer, Lissette Jimenez, Joseph T. Roland, Elena Kolobova, Susan J. Hagen, Jeffrey D. Goldsmith, Mitchell D. Shub, James R. Goldenring, Izumi Kaji, and Jay R. Thiagarajah

Keywords:

Microvillus Inclusion Disease, enteroids, MVID, SGK2, NHERF3

Abstract:

Microvillus Inclusion Disease (MVID), caused by loss-of-function mutations in the motor protein Myosin Vb (MYO5B), is a severe infantile disease characterized by diarrhea, malabsorption, and acid-base instability, requiring intensive parenteral support for nutritional and fluid management. Human patient-derived enteroids represent a model for investigation of monogenic epithelial disorders but are a rare resource from MVID patients. We developed human enteroids with different loss-of function MYO5B variants and showed that they recapitulated the structural changes found in native MVID enterocytes. Multiplex Immunofluorescence imaging of patient duodenal tissues revealed patient-specific changes in localization of brush border transporters. Functional analysis of electrolyte transport revealed profound loss of Na+/H+ exchange (NHE) activity in MVID patient enteroids with near-normal chloride secretion. The chloride channel-blocking anti-diarrheal drug, Crofelemer, dose-dependently inhibited agonist-mediated fluid secretion. MVID enteroids exhibited altered differentiation and maturation versus healthy enteroids. Gamma-secretase inhibition with DAPT recovered apical brush border structure and functional Na+/H+ exchange activity in MVID enteroids. Transcriptomic analysis revealed potential pathways involved in the rescue of MVID cells including serum- and glucocorticoid-induced protein kinase 2 (SGK2), and NHE regulatory factor 3 (NHERF3). These results demonstrate the utility of patient-derived enteroids for developing therapeutic approaches to MVID.

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