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Mutation analysis in Spanish patients with hereditary hemorrhagic telangiectasia: deficient endoglin up-regulation in activated monocytes.

Authors: Sanz-Rodriguez, F  Fernandez-L, A  Zarrabeitia, R  Perez-Molino, A  Ramirez, JR  Coto, E  Bernabeu, C  Botella, LM 
Citation: Sanz-Rodriguez F, etal., Clin Chem. 2004 Nov;50(11):2003-11. Epub 2004 Sep 16.
Pubmed: (View Article at PubMed) PMID:15375013
DOI: Full-text: DOI:10.1373/clinchem.2004.035287

BACKGROUND: Mutations in the endoglin (ENG) or ALK1 genes are responsible for hereditary hemorrhagic telangiectasia types 1 and 2 (HHT1 and HHT2), respectively, a dominant vascular dysplasia caused by haploinsufficiency. No formal mutation studies of patients with HHT have been conducted in Spain. METHODS: ENG and ALK1 mutation analyses were carried out in 13 Spanish HHT patients diagnosed according to the Curacao criteria. Because endoglin is up-regulated at the cell surface during the monocyte-macrophage transition, endoglin concentrations in activated monocytes were determined by immunofluorescence flow cytometry in a systematic analysis. As controls, 40 non-HHT volunteers were studied for up-regulation of endoglin in activated monocytes. RESULTS: The mutation responsible for HHT was identified in eight patients belonging to two unrelated families. One of the families has a nonsense mutation in exon 4 (c.511C>T; R171X) of the ENG gene, and accordingly the disorder was identified as HHT1. The other family has a missense mutation affecting exon 8 (c.1120C>T; R374W) of the ALK1 gene, and hence is a HHT2 family. Interestingly, endoglin up-regulation was deficient in activated monocytes of both HHT1 and HHT2 patients compared with controls. By contrast, endoglin up-regulation was age-independent in control donors across a broad range of ages. The extent of endoglin up-regulation in activated monocytes was most diminished in those patients with the most severe symptoms. CONCLUSIONS: Endoglin up-regulation in activated monocytes is impaired in HHT1 and HHT2 patients and is age-dependent in both HHT types. Endoglin expression may predict the clinical severity of HHT.


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CRRD Object Information
CRRD ID: 11041169
Created: 2016-03-23
Species: All species
Last Modified: 2016-03-23
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.