Increased Gs signalling in platelets and impaired collagen activation, due to a defect in the dystrophin gene, result in increased blood loss during spinal surgery
| العنوان: | Increased Gs signalling in platelets and impaired collagen activation, due to a defect in the dystrophin gene, result in increased blood loss during spinal surgery |
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| المؤلفون: | Christine Wittevrongel, Nathalie Goemans, Veerle Labarque, Marc Hoylaerts, Rita Vos, Chris Van Geet, Chantal Thys, Kathleen Freson |
| المصدر: | Human Molecular Genetics. 17:357-366 |
| بيانات النشر: | Oxford University Press (OUP), 2007. |
| سنة النشر: | 2007 |
| مصطلحات موضوعية: | Blood Platelets, Male, musculoskeletal diseases, congenital, hereditary, and neonatal diseases and abnormalities, medicine.medical_specialty, Gs alpha subunit, Cytoskeleton organization, Duchenne muscular dystrophy, Blood Loss, Surgical, In Vitro Techniques, Dystrophin, Extracellular matrix, Von Willebrand factor, Laminin, Internal medicine, GTP-Binding Protein alpha Subunits, Gs, Genetics, medicine, Humans, Platelet, Child, Molecular Biology, Cytoskeleton, Genetics (clinical), biology, General Medicine, Platelet Activation, medicine.disease, Muscular Dystrophy, Duchenne, Spinal Fusion, Endocrinology, Case-Control Studies, Mutation, biology.protein, Collagen, Signal Transduction |
| الوصف: | Controversy exists regarding the cause of the significantly increased blood loss during spinal surgery in Duchenne muscular dystrophy (DMD) patients compared with similar surgery in other patients. DMD is caused by a mutation in the cytoskeletal dystrophin, which binds to extracellular matrix laminin and which has been described as a G-protein-coupled receptor. We hypothesized that disturbed cytoskeleton organization in DMD patients would alter Gs protein and collagen signalling in platelets, leading to dysfunctional platelets and a haemorrhagic tendency during surgery. In the present study, we found that platelets and skin fibroblasts, respectively, express the Dp71 and Dp116 dystrophin isoforms. Absent or decreased expression of these isoforms in DMD patients correlates with significant Gs alpha upregulation. Moreover, dysfunctional dystrophin in these cells is accompanied with increased Gs signalling and higher cAMP levels after Gs stimulation. Functional analysis showed that DMD platelets responded slower to collagen with an extensive shape change in the aggregometer and with a significantly reduced platelet adhesion to coated collagen under flow. The decreased collagen activation was shown to result from both Gs activation and cytoskeletal disruption and not from decreased expression of platelet membrane receptors or impaired von Willebrand factor (vWF) activity. In conclusion, DMD platelets have a disorganized cytoskeleton and manifest Gs hyperactivity and reduced platelet collagen reactivity. Their increased bleeding during surgery will, at least partly, result from the increased platelet Gs activity after the release of natural Gs agonists as prostacyclin during surgery and an ineffective reactivity to collagen. |
| تدمد: | 1460-2083 0964-6906 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1091c5b84531e98de52d17c5e3fde29bTest https://doi.org/10.1093/hmg/ddm312Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....1091c5b84531e98de52d17c5e3fde29b |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14602083 09646906 |
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