Associations of Vitamin D Deficiency and Vitamin D Receptor Polymorphisms With the Risk of Primary Open-angle Glaucoma

April 21, 2016 updated by: Lv Yingjuan
This study investigated whether vitamin D receptor gene polymorphism is altered in primary open-angle glaucoma subjects carrying the risk allele and vitamin D deficiency is an important factor in the development of glaucoma. Primary open-angle glaucoma patients and age-matched people in the Han population were enrolled. Serum levels of 1a, 25-Dihydroxyvitamin D3 were measured by enzyme-linked immunoabsorbent assay. Vitamin D receptor polymorphic analysis was studied by real-time polymerase-chain reaction high resolution melting analysis.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Observational

Enrollment (Actual)

200

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • China
    • Tianjin
      • Tianjin, Tianjin, China, 300384
        • Tianjin Medical University Eye Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

55 years to 65 years (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Sampling Method

Probability Sample

Study Population

primary open-angle glaucoma patients and randomly age-matched people as controls in the Han population of Tianjin China

Description

Inclusion Criteria:

  • intraocular pressure greater than 22 mmHg with two or more medications
  • wide anterior chamber angle
  • glaucomatous optic neuropathy (Glaucomatous optic nerve damage was defined as cup-to-disc ratio higher than 0.7 or focal loss of the nerve fiber layer (notch) associated with a consistent glaucomatous visual field defect)
  • visual field loss consistent with optic nerve damage and visual fields were performed by using standard automated perimetry

Exclusion Criteria:

  • the presence of any secondary glaucoma including exfoliation syndrome or a history of ocular trauma
  • high myopia
  • macular degeneration
  • other ocular diseases
  • a known history of systemic diseases and administration of vitamin D3 or other analog

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
primary open-angle glaucoma patients
Serum levels of 1a, 25-Dihydroxyvitamin D3 were measured by enzyme-linked immunoabsorbent assay and vitamin D receptor polymorphic analysis was studied by real-time polymerase-chain reaction high resolution melting analysis in primary open-angle glaucoma patients.
Other: Vitamin D receptor polymorphic analysis
Vitamin D receptor polymorphic analysis was studied by real-time polymerase-chain reaction high resolution melting analysis.
Other: Serum levels of 1a, 25-Dihydroxyvitamin D3
Serum levels of 1a, 25-Dihydroxyvitamin D3 were measured by enzyme-linked immunoabsorbent assay.
randomly age-matched people
Serum levels of 1a, 25-Dihydroxyvitamin D3 were measured by enzyme-linked immunoabsorbent assay and vitamin D receptor polymorphic analysis was studied by real-time polymerase-chain reaction high resolution melting analysis in randomly age-matched people.
Other: Vitamin D receptor polymorphic analysis
Vitamin D receptor polymorphic analysis was studied by real-time polymerase-chain reaction high resolution melting analysis.
Other: Serum levels of 1a, 25-Dihydroxyvitamin D3
Serum levels of 1a, 25-Dihydroxyvitamin D3 were measured by enzyme-linked immunoabsorbent assay.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Serum levels of 1a, 25-Dihydroxyvitamin D3
Time Frame: 1 day visit
1 day visit

Secondary Outcome Measures

Outcome Measure
Time Frame
gene polymorphisms of vitamin D receptor
Time Frame: 1 day visit
1 day visit

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Lv Yingjuan

Investigators

  • Study Director: xiaorong li, Tianjin Medical University Eye Hospital

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

July 1, 2013

Primary Completion (Actual)

December 1, 2014

Study Completion (Actual)

March 1, 2015

Study Registration Dates

First Submitted

August 3, 2015

First Submitted That Met QC Criteria

August 31, 2015

First Posted (Estimate)

September 3, 2015

Study Record Updates

Last Update Posted (Estimate)

April 22, 2016

Last Update Submitted That Met QC Criteria

April 21, 2016

Last Verified

April 1, 2016

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • tjykdxykyy1

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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