TY - JOUR
T1 - CFTR Function Restoration upon Elexacaftor/Tezacaftor/Ivacaftor Treatment in Patient-Derived Intestinal Organoids with Rare CFTR Genotypes.
AU - Lefferts, Juliet W
AU - Bierlaagh, Marlou C
AU - Kroes, Suzanne
AU - Nieuwenhuijze, Natascha D A
AU - Sonneveld van Kooten, Heleen N
AU - Niemöller, Paul J
AU - Verburg, Tibo F
AU - Janssens, Hettie M
AU - Muilwijk, Danya
AU - van Beuningen, Sam F B
AU - van der Ent, Cornelis K
AU - Beekman, Jeffrey M
N1 - Publisher Copyright:
© 2023 by the authors.
PY - 2023/10
Y1 - 2023/10
N2 - Cystic fibrosis (CF) is caused by mutations in the
Cystic Fibrosis Transmembrane conductance Regulator (
CFTR) gene. The combination of the CFTR modulators elexacaftor, tezacaftor, and ivacaftor (ETI) enables the effective rescue of CFTR function in people with the most prevalent F508del mutation. However, the functional restoration of rare
CFTR variants remains unclear. Here, we use patient-derived intestinal organoids (PDIOs) to identify rare
CFTR variants and potentially individuals with CF that might benefit from ETI. First, steady-state lumen area (SLA) measurements were taken to assess CFTR function and compare it to the level observed in healthy controls. Secondly, the forskolin-induced swelling (FIS) assay was performed to measure CFTR rescue within a lower function range, and to further compare it to ETI-mediated CFTR rescue in CFTR genotypes that have received market approval. ETI responses in 30 PDIOs harboring the F508del mutation served as reference for ETI responses of 22 PDIOs with genotypes that are not currently eligible for CFTR modulator treatment, following European Medicine Agency (EMA) and/or U.S. Food and Drug Administration (FDA) regulations. Our data expand previous datasets showing a correlation between in vitro CFTR rescue in organoids and corresponding in vivo ppFEV1 improvement upon a CFTR modulator treatment in published clinical trials, and suggests that the majority of individuals with rare
CFTR variants could benefit from ETI. CFTR restoration was further confirmed on protein levels using Western blot. Our data support that CFTR function measurements in PDIOs with rare
CFTR genotypes can help to select potential responders to ETI, and suggest that regulatory authorities need to consider providing access to treatment based on the principle of equality for people with CF who do not have access to treatment.
AB - Cystic fibrosis (CF) is caused by mutations in the
Cystic Fibrosis Transmembrane conductance Regulator (
CFTR) gene. The combination of the CFTR modulators elexacaftor, tezacaftor, and ivacaftor (ETI) enables the effective rescue of CFTR function in people with the most prevalent F508del mutation. However, the functional restoration of rare
CFTR variants remains unclear. Here, we use patient-derived intestinal organoids (PDIOs) to identify rare
CFTR variants and potentially individuals with CF that might benefit from ETI. First, steady-state lumen area (SLA) measurements were taken to assess CFTR function and compare it to the level observed in healthy controls. Secondly, the forskolin-induced swelling (FIS) assay was performed to measure CFTR rescue within a lower function range, and to further compare it to ETI-mediated CFTR rescue in CFTR genotypes that have received market approval. ETI responses in 30 PDIOs harboring the F508del mutation served as reference for ETI responses of 22 PDIOs with genotypes that are not currently eligible for CFTR modulator treatment, following European Medicine Agency (EMA) and/or U.S. Food and Drug Administration (FDA) regulations. Our data expand previous datasets showing a correlation between in vitro CFTR rescue in organoids and corresponding in vivo ppFEV1 improvement upon a CFTR modulator treatment in published clinical trials, and suggests that the majority of individuals with rare
CFTR variants could benefit from ETI. CFTR restoration was further confirmed on protein levels using Western blot. Our data support that CFTR function measurements in PDIOs with rare
CFTR genotypes can help to select potential responders to ETI, and suggest that regulatory authorities need to consider providing access to treatment based on the principle of equality for people with CF who do not have access to treatment.
KW - CFTR modulator therapy
KW - cystic fibrosis
KW - elexacaftor/tezacaftor/ivacaftor
KW - intestinal organoids
KW - rare genotypes
KW - theranostics
KW - theratyping
UR - http://www.scopus.com/inward/record.url?scp=85174723971&partnerID=8YFLogxK
U2 - 10.3390/ijms241914539
DO - 10.3390/ijms241914539
M3 - Article
C2 - 37833986
SN - 1422-0067
VL - 24
JO - International Journal of Molecular Sciences
JF - International Journal of Molecular Sciences
IS - 19
M1 - 14539
ER -