Personale tecnico amministrativo presso: Dipartimento di Scienze della Vita sede ex-Scienze Biomediche
- Innovative Flow Cytometry Allows Accurate Identification of Rare Circulating Cells Involved in Endothelial Dysfunction
[Articolo su rivista]
Boraldi, Federica; Bartolomeo, Angelica; De Biasi, Sara; Orlando, Stefania; Costa, Sonia; Cossarizza, Andrea; Quaglino, Daniela
Although rare, circulating endothelial and progenitor cells could be considered as markers of endothelial damage and repair potential, possibly predicting the severity of cardiovascu- lar manifestations. A number of studies highlighted the role of these cells in age-related dis- eases, including those characterized by ectopic calcification. Nevertheless, their use in clinical practice is still controversial, mainly due to difficulties in finding reproducible and accurate methods for their determination.
Circulating mature cells (CMC, CD45-, CD34+, CD133-) and circulating progenitor cells (CPC, CD45dim, CD34bright, CD133+) were investigated by polychromatic high-speed flow cytometry to detect the expression of endothelial (CD309+) or osteogenic (BAP+) differentia- tion markers in healthy subjects and in patients affected by peripheral vascular manifesta- tions associated with ectopic calcification.
This study shows that: 1) polychromatic flow cytometry represents a valuable tool to accu- rately identify rare cells; 2) the balance of CD309+ on CMC/CD309+ on CPC is altered in patients affected by peripheral vascular manifestations, suggesting the occurrence of vas- cular damage and low repair potential; 3) the increase of circulating cells exhibiting a shift towards an osteoblast-like phenotype (BAP+) is observed in the presence of ectopic calcification.
Differences between healthy subjects and patients with ectopic calcification indicate that this approach may be useful to better evaluate endothelial dysfunction in a clinical context.
- Can APOE and MTHFR polymorphisms have an influence on the severity of cardiovascular manifestations in Italian Pseudoxanthoma elasticum affected patients?
[Articolo su rivista]
Boraldi, Federica; Costa, Sonia; Rabacchi, Claudio; Ciani, Miriam; Vanakker, Olivier; Quaglino, Daniela
Background: The clinical phenotype of Pseudoxanthoma elasticum (PXE) affected patients, although progressive with age, is very heterogeneous, even in the presence of identical ABCC6 mutations, thus suggesting the occur- rence of modifier genes. Beside typical skin manifestations, the cardiovascular (CV) system, and especially the peripheral vasculature, is frequently and prematurely compromised.
Methods and results: A cohort of 119 Italian PXE patients has been characterized for apolipoprotein E (APOE) and methylenetetrahydrofolate reductase (MTHFR) gene polymorphisms by PCR. The severity of the clinical phe- notype has been quantified according to the Phenodex PXE International score system. Statistical analysis (chi2 test, odd ratio, regression analysis, analysis of variance) were done by GraphPad. Data demonstrate that the fre- quency of APOE alleles is similar in PXE patients and in healthy subjects and that the allelic variant E2 confers a protection against the age-related increase of CV manifestations. By contrast, PXE patients are characterized by high frequency of the MTHFR-T677T polymorphism. With age, CV manifestations in T677T, but also in C677T, pa- tients are more severe than those associated with the C677C genotype. Interestingly, compound heterozygosity for C677T and A1298C polymorphisms is present in 70% of PXE patients.
Conclusions: PXE patients may be screened for these polymorphisms in order to support clinicians for a better management of disease-associated CV complications.
- Elastic fiber abnormalities in a case of Beals Sindrome
[Abstract in Atti di Convegno]
D. GUERRA; S. COSTA; D. QUAGLINO
Abnormalieties in dermal and vascular elastic fibers in a patient affected by Beal Syndrome are described at the ultrastrutural level. The tissue-specific involvement of GAGs are also discussed.
- Rearrangements of the ABCC6 gene in Italian patients with PXE
[Abstract in Rivista]
D. GUERRA; S. COSTA; J. ROGGIANI; C. RABACCHI; S. CALANDRA-BUONAURA; I. PASQUALI-RONCHETTI; D. QUAGLINO
The objective of this study was to search for the deletion of exon 24 and exons 24-27 that had been previously reported in Italian patients affected by pseudoxanthoma elasticum, anb autosomal recessive disorder characterized by calcification and fragmentation of elastic fibers as a conseguence of mutations in the ABCC6 gene. To detect deletions in the ABCC6 gene the development and use of long range PCR procedure using appropriately designed primers are described.