Characterization of Pseudoxanthoma Elasticum

NCT02108392 | Unknown DMC

• 1 other identifier: pending
• Study Type: observational
• Target: 100
• Locations: 1 country
• Sites: 1

Brief Summary

Pseudoxanthoma elasticum (PXE) is a rare multisystem disorder of autosomal recessive inheritance (OMIM# 264800) and an estimated prevalence between 1:25.000 and 1:100.000. PXE is characterized by calcification and fragmentation of connective tissue rich in elastic fibers. Due to its high content of elastic fibers, Bruch Membrane in eyes of patients affected by PXE becomes thickened and calcified. The ocular phenotype is characterized by angioid streaks and peau d'orange but also choroidal neovascularizations and chorioretinal atrophy thereby in part mimicking the phenotype of age-related macular degeneration. The disease is due to mutations of the ABCC6-gene coding for a transmembrane protein which is mainly expressed in the liver and kidney. It is hypothesized that ABCC6 is involved in the excretion of a yet unknown factor from the liver which inhibits systemic calcification. In animal models several candidates for this factor have been identified but direct evidence for such a factor in patients with PXE is still missing. The primary purpose of this study is to further investigate the ocular phenotype of patients with PXE using multimodal imaging and functional testing to delineate the impact of Bruch membrane pathology on the eye. Furthermore, possible systemic anti-calcification factors, as well as associations with the vascular alterations are investigated to gain more insights into the pathogenesis of PXE..

Conditions

Pseudoxanthoma Elasticum

Keywords

PXE; phenotype; eye; biomarkers

Outcome Measures

Primary Outcomes (1)

• Ocular phenotype

  Patients are investigated using a multimodal imaging approach and visual function testing.

  patients will be followed longitudinally with an expected 1-year average interval between visits

Secondary Outcomes (1)

• Biomarkers in PXE

  1 day (first visit)

Eligibility Criteria

• Sex: all
• Healthy Volunteers: No
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)
• Sampling Method: Non-Probability Sample

Study Population

Pseudoxanthoma elasticum

You may qualify if:

• Diagnosis of Pseudoxanthoma elastcium based on histopathologic and/or genetic testing

Sponsors & Collaborators

• University Hospital, Bonn: lead

Study Sites (1)

Department of Ophthalmology, University of Bonn

Bonn, North Rhine-Westphalia, 53127, Germany

Location

Related Publications (11)

• Gliem M, Zaeytijd JD, Finger RP, Holz FG, Leroy BP, Charbel Issa P. An update on the ocular phenotype in patients with pseudoxanthoma elasticum. Front Genet. 2013 Apr 4;4:14. doi: 10.3389/fgene.2013.00014. eCollection 2013.

  PMID: 23577018 BACKGROUND

• Finger RP, Fenwick E, Marella M, Charbel Issa P, Scholl HP, Holz FG, Lamoureux EL. The relative impact of vision impairment and cardiovascular disease on quality of life: the example of pseudoxanthoma elasticum. Health Qual Life Outcomes. 2011 Dec 12;9:113. doi: 10.1186/1477-7525-9-113.

  PMID: 22152229 BACKGROUND

• Charbel Issa P, Finger RP, Gotting C, Hendig D, Holz FG, Scholl HP. Centrifugal fundus abnormalities in pseudoxanthoma elasticum. Ophthalmology. 2010 Jul;117(7):1406-14. doi: 10.1016/j.ophtha.2009.11.008. Epub 2010 Mar 1.

  PMID: 20189652 BACKGROUND

• Finger RP, Charbel Issa P, Ladewig M, Gotting C, Holz FG, Scholl HP. Fundus autofluorescence in Pseudoxanthoma elasticum. Retina. 2009 Nov-Dec;29(10):1496-505. doi: 10.1097/IAE.0b013e3181aade47.

  PMID: 19823106 BACKGROUND

• Charbel Issa P, Finger RP, Holz FG, Scholl HP. Multimodal imaging including spectral domain OCT and confocal near infrared reflectance for characterization of outer retinal pathology in pseudoxanthoma elasticum. Invest Ophthalmol Vis Sci. 2009 Dec;50(12):5913-8. doi: 10.1167/iovs.09-3541. Epub 2009 Jun 24.

  PMID: 19553619 BACKGROUND

• Gliem M, Finger RP, Fimmers R, Brinkmann CK, Holz FG, Charbel Issa P. Treatment of choroidal neovascularization due to angioid streaks: a comprehensive review. Retina. 2013 Jul-Aug;33(7):1300-14. doi: 10.1097/IAE.0b013e3182914d2b.

  PMID: 23719398 BACKGROUND

• Gliem M, Fimmers R, Muller PL, Brinkmann CK, Finger RP, Hendig D, Holz FG, Charbel Issa P. Choroidal changes associated with Bruch membrane pathology in pseudoxanthoma elasticum. Am J Ophthalmol. 2014 Jul;158(1):198-207.e3. doi: 10.1016/j.ajo.2014.04.005. Epub 2014 Apr 13.

  PMID: 24727260 BACKGROUND

• Charbel Issa P, Gliem M, Holz FG, Knabbe C, Hendig D. [Pseudodominant inheritance of pseudoxanthoma elasticum]. Ophthalmologe. 2015 Aug;112(8):686-90. doi: 10.1007/s00347-014-3231-9. German.

  PMID: 25735631 BACKGROUND

• Gliem M, Hendig D, Finger RP, Holz FG, Charbel Issa P. Reticular pseudodrusen associated with a diseased bruch membrane in pseudoxanthoma elasticum. JAMA Ophthalmol. 2015 May;133(5):581-8. doi: 10.1001/jamaophthalmol.2015.117.

  PMID: 25764262 BACKGROUND

• Gliem M, Muller PL, Birtel J, Hendig D, Holz FG, Charbel Issa P. Frequency, Phenotypic Characteristics and Progression of Atrophy Associated With a Diseased Bruch's Membrane in Pseudoxanthoma Elasticum. Invest Ophthalmol Vis Sci. 2016 Jun 1;57(7):3323-30. doi: 10.1167/iovs.16-19388.

  PMID: 27367499 BACKGROUND

• Gliem M, Muller PL, Birtel J, McGuinness MB, Finger RP, Herrmann P, Hendig D, Holz FG, Charbel Issa P. Quantitative Fundus Autofluorescence in Pseudoxanthoma Elasticum. Invest Ophthalmol Vis Sci. 2017 Dec 1;58(14):6159-6165. doi: 10.1167/iovs.17-22007.

  PMID: 29214314 BACKGROUND

Related Links

• Webpage of the University Eye Hospital of Bonn

Biospecimen

Retention: SAMPLES WITH DNA

whole blood samples

MeSH Terms

Conditions

Pseudoxanthoma Elasticum

Condition Hierarchy (Ancestors)

Hemostatic Disorders; Vascular Diseases; Cardiovascular Diseases; Hemorrhagic Disorders; Hematologic Diseases; Hemic and Lymphatic Diseases; Skin Abnormalities; Congenital Abnormalities; Congenital, Hereditary, and Neonatal Diseases and Abnormalities; Skin Diseases, Genetic; Genetic Diseases, Inborn; Connective Tissue Diseases; Skin and Connective Tissue Diseases; Skin Diseases

Study Officials

• Peter Charbel Issa, MD

  Department of Ophthalmology, University of Bonn

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: observational
• Observational Model: OTHER
• Time Perspective: PROSPECTIVE
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: MD

Study Record Dates

• First Submitted: April 1, 2014
• First Posted: April 9, 2014
• Study Start: January 1, 2014
• Primary Completion: December 1, 2018
• Study Completion: December 1, 2018
• Last Updated: June 20, 2018

Record last verified: 2018-06

Locations

DE (1)