2. Academic Validation
  3. Characterization of five novel vasopressin V2 receptor mutants causing nephrogenic diabetes insipidus reveals a role of tolvaptan for M272R-V2R mutation

Characterization of five novel vasopressin V2 receptor mutants causing nephrogenic diabetes insipidus reveals a role of tolvaptan for M272R-V2R mutation

  • Sci Rep. 2020 Oct 2;10(1):16383. doi: 10.1038/s41598-020-73089-x.
Federica Prosperi  # 1,  Yoko Suzumoto  # 1,  Pierluigi Marzuillo 2,  Vincenzo Costanzo 1,  Sabina Jelen 1,  Anna Iervolino 1,  Stefano Guarino 2,  Angela La Manna 2,  Emanuele Miraglia Del Giudice 2,  Alessandra F Perna 3,  Miriam Zacchia 3,  Emmanuelle Cordat 4,  Giovambattista Capasso 1 3,  Francesco Trepiccione 5 6
Affiliations

Affiliations

  • 1 Biogem S.c.a.r.l., Istituto Di Ricerche Genetiche "Gaetano Salvatore", Ariano Irpino, Italy.
  • 2 Department of Woman, Child and of General and Specialized Surgery, University of Campania "L. Vanvitelli", Naples, Italy.
  • 3 Department of Translational Medical Sciences, University of Campania "L. Vanvitelli", Naples, Italy.
  • 4 Department of Physiology, The University of Alberta, Edmonton, Canada.
  • 5 Biogem S.c.a.r.l., Istituto Di Ricerche Genetiche "Gaetano Salvatore", Ariano Irpino, Italy. Francesco.trepiccione@unicampania.it.
  • 6 Department of Translational Medical Sciences, University of Campania "L. Vanvitelli", Naples, Italy. Francesco.trepiccione@unicampania.it.
  • # Contributed equally.
PMID: 33009446 DOI: 10.1038/s41598-020-73089-x
Abstract

Nephrogenic diabetes insipidus (NDI) is a rare tubulopathy characterized by urinary concentration defect due to renal resistance to vasopressin. Loss-of-function mutations of vasopressin V2 receptor (V2R) gene (AVPR2) is the most common cause of the disease. We have identified five novel mutations L86P, R113Q, C192S, M272R, and W323_I324insR from NDI-affected patients. Functional characterization of these mutants revealed that R113Q and C192S were normally localized at the basolateral membrane of polarized Madin-Darby Canine Kidney (MDCK) cells and presented proper glycosylation maturation. On the Other side, L86P, M272R, and W323_I324insR mutants were retained in endoplasmic reticulum and exhibited immature glycosylation and considerably reduced stability. All five mutants were resistant to administration of vasopressin analogues as evaluated by defective response in cAMP release. In order to rescue the function of the mutated V2R, we tested VX-809, sildenafil citrate, ibuprofen and tolvaptan in MDCK cells. Among these, tolvaptan was effective in rescuing the function of M272R mutation, by both allowing proper glycosylation maturation, membrane sorting and response to dDAVP. These results show an important proof of concept for the use of tolvaptan in patients affected by M272R mutation of V2R causing NDI.

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