We studied the relationship between heme accumulation and globin synthesis in human erythroid precursors which were stimulated by 2 I.U. of erythropoietin in semi-solid cultures (1% methyl-cellulose, 20% fetal calf serum) and treated with 6-9 micrograms/ml of desferrioxamina (DF), a potent inhibitor of heme synthesis (6). Heme accumulation was detected by specific reaction with benzidine (4), globin synthesis by CM-cellulose column chromatography. Our results demonstrate that globin gene expression occurs in DF-treated erythroid cells which do not accumulate heme molecules. As heme does affect translation and stability of globin mRNA (10) our system might be suitable for studies focused on pathological alterations of erythropoiesis associated with the presence of unstable globin mRNAs and/or unstable globins.
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Hypomethylating agents for patients with VEXAS without myelodysplastic syndrome: Clinical outcome and longitudinal follow-up of vacuolization and UBA1 clonal dynamics.
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January 2025
Institut d'Investigacions Biomèdiques August Pi iSunyer (IDIBAPS), Barcelona, Spain.
VEXAS syndrome is a haemato-inflammatory disease caused by somatic UBA1 mutations and characterized by cytoplasmic vacuoles in myeloid and erythroid precursor cells. Although there is currently no standard treatment algorithm for VEXAS, patients are generally treated with anti-inflammatory therapies focused on symptom management, with only partial effectiveness. Hypomethylating agents (HMA) have shown promise in VEXAS patients with concomitant myelodysplastic syndrome (MDS), while the efficacy of HMA in VEXAS patients without MDS is largely unknown.
View Article and Find Full Text PDFA β-Thalassemia Cell Biobank: Updates, Further Validation in Genetic and Therapeutic Research and Opportunities During (and After) the COVID-19 Pandemic.
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: Cellular biobanks are of great interest for performing studies finalized in the development of personalized approaches for genetic diseases, including β-thalassemia and sickle cell disease (SCD), important diseases affecting the hematopoietic system. These inherited genetic diseases are characterized by a global distribution and the need for intensive health care. The aim of this report is to present an update on the composition of a cellular Thal-Biobank, to describe its utilization since 2016, to present data on its application in studies on fetal hemoglobin induction and on gene editing, and to discuss its employment as a "unique tool" during and after the COVID-19 pandemic.
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View Article and Find Full Text PDFNew low-dose curcumin derivative with therapeutic potential in Alzheimer's disease: Results from an in vitro and in vivo study in mice.
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View Article and Find Full Text PDF[VEXAS-like auto inflammatory syndrome: 2 cases].
Rev Med Interne
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Service de médecine interne, CHI Poissy-St Germain, 10, rue du Champs Gaillard, 78300 Poissy, France.
Introduction: VEXAS syndrome (vacuoles, E1 enzyme, X-linked, autoinflammatory, somatic), recently described, due to a somatic mutation of the UBA1 gene and often associated with hemopathy, is characterized by systemic symptoms close to those described in Still's disease or relapsing polychondritis. There are also patients with hemopathy, presenting inflammatory symptoms reminiscent of those of VEXAS syndrome but without mutation of the UBA1 gene.
Case/discussion: Two male patients consulted for general signs, dermatological symptoms, arthralgia, chondritis and venous thrombosis, like patients in the French cohort suffering from VEXAS syndrome.
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