Progeroid syndromes (PS), including Hutchinson-Gilford Progeria Syndrome (HGPS), are premature and accelerated aging diseases, characterized by clinical features mimicking physiological aging. Most classical HGPS patients carry a de novo point mutation within exon 11 of the LMNA gene encoding A-type lamins. This mutation activates a cryptic splice site, leading to the production of a truncated prelamin A, called prelamin A ∆50 or progerin, that accumulates in HGPS cell nuclei and is a hallmark of the disease. Some patients with PS carry other LMNA mutations and are named “HGPS-like” patients. They produce progerin and/or other truncated prelamin A isoforms (∆35 and ∆90). We previously found that MG132, a proteasome inhibitor, induced progerin clearance in classical HGPS through autophagy activation and splicing regulation. Here, we show that MG132 induces aberrant prelamin A clearance and improves cellular phenotypes in HGPS-like patients’ cells other than those previously described in classical HGPS. These results provide preclinical proof of principle for the use of a promising class of molecules toward a potential therapy for children with HGPS-like or classical HGPS.
Bibliographical noteFunding Information:
Funding: This work was supported by the French Muscular Dystrophy Association: AFM (“Mod-elisation and Therapeutic Approaches for Rare Diseases (MoThARD): 2021–2025” and “TRIM-RD: 2016–2020” to A.D.S.G. and N.L.), the Institut National de la Santé et de la Recherche Médicale (INSERM): recurrent grants and Aix-Marseille University (AMU): recurrent grants.
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- Prelamin A ∆35
- Prelamin A ∆90