Inhibiting farnesylation of progerin prevents the characteristic nuclear blebbing of Hutchinson-Gilford progeria syndrome
| Autor: | James P. Madigan, Karen N. Conneely, Michael R. Erdos, Adrienne D. Cox, Leslie B. Gordon, Francis S. Collins, Renee Varga, Channing J. Der, James J. Fiordalisi, Brian C. Capell |
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| Rok vydání: | 2005 |
| Předmět: |
Premature aging
congenital hereditary and neonatal diseases and abnormalities Farnesyltransferase Protein Prenylation Cell Line LMNA Mice Progeria Prenylation medicine Animals Farnesyltranstransferase Humans Enzyme Inhibitors Nuclear membrane Cell Nucleus Alkyl and Aryl Transferases Multidisciplinary integumentary system biology nutritional and metabolic diseases Biological Sciences Lamin Type A Progerin medicine.disease Molecular biology Cell biology medicine.anatomical_structure Mutation biology.protein lipids (amino acids peptides and proteins) Lamin |
| Zdroj: | Proceedings of the National Academy of Sciences. 102:12879-12884 |
| ISSN: | 1091-6490 0027-8424 |
| Popis: | Hutchinson-Gilford progeria syndrome (HGPS) is a rare genetic disorder that is characterized by dramatic premature aging and accelerated cardiovascular disease. HGPS is almost always caused by a de novo point mutation in the lamin A gene ( LMNA ) that activates a cryptic splice donor site, producing a truncated mutant protein termed “progerin.” WT prelamin A is anchored to the nuclear envelope by a farnesyl isoprenoid lipid. Cleavage of the terminal 15 aa and the farnesyl group releases mature lamin A from this tether. In contrast, this cleavage site is deleted in progerin. We hypothesized that retention of the farnesyl group causes progerin to become permanently anchored in the nuclear membrane, disrupting proper nuclear scaffolding and causing the characteristic nuclear blebbing seen in HGPS cells. Also, we hypothesized that blocking farnesylation would decrease progerin toxicity. To test this hypothesis, the terminal CSIM sequence in progerin was mutated to SSIM, a sequence that cannot be farnesylated. SSIM progerin relocalized from the nuclear periphery into nucleoplasmic aggregates and produced no nuclear blebbing. Also, blocking farnesylation of authentic progerin in transiently transfected HeLa, HEK 293, and NIH 3T3 cells with farnesyltransferase inhibitors (FTIs) restored normal nuclear architecture. Last, treatment of both early- and late-passage human HGPS fibroblasts with FTIs resulted in significant reductions in nuclear blebbing. Our results suggest that treatment with FTIs represents a potential therapy for patients with HGPS. |
| Databáze: | OpenAIRE |
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