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临床试验/NCT02464059
NCT02464059已完成2 期

Cathelicidin and Vitamin D: Impact on Populations At-Risk and With COPD

University of North Carolina, Chapel Hill2 个研究点 分布在 1 个国家目标入组 23 人开始时间: 2015年11月10日最近更新:
适应症
干预措施
相关药物

试验速览

阶段
2 期
状态
已完成
入组人数
23
试验地点
2
主要终点
Change From Baseline in Lung Cathelicidin Level at 8 Weeks

研究概览

简要总结

This proposal will evaluate a potential mechanism of increased risk of lung function impairment, cathelicidin levels, as well as determine if vitamin D replacement can alter this pathway. This study will improve the understanding of factors which can lead to chronic lung disease. If effective, this application would also provide the justification to study vitamin D as a therapy to improve lung health.

详细描述

Understanding mechanisms leading to decrements in lung function, the physiologic hallmark of obstructive lung diseases including chronic obstructive pulmonary disease (COPD), are necessary to inform interventions to improve lung health. The antimicrobial peptide cathelicidin, and its primary regulator vitamin D, has been implicated in development and progression of chronic lung disease. In this study, the investigators will evaluate the effect of oral vitamin D supplementation on lung cathelicidin levels in humans. Cathelicidin has bactericidal and inflammatory activities in the lung and is regulated by vitamin D levels. The investigators hypothesize that oral vitamin D supplementation will raise cathelicidin levels in the pulmonary compartment, thereby restoring lung cathelicidin deficiency. To test this hypothesis, the investigators will recruit from two ongoing cohort studies: 1) At Johns Hopkins, the Subpopulations and Intermediate Outcome Measures in COPD Study study and 2)at University of North Carolina at Chapel Hill pulmonary and general medicine clinic. The investigators will measure blood and lung lavage cathelicidin levels in 40 vitamin D insufficient individuals (20 from each cohort) before and after eight weeks of oral vitamin D supplementation to determine the effect of vitamin D supplementation on cathelicidin levels.

研究设计

研究类型
Interventional
分配方式
Na
干预模型
Single Group
主要目的
Basic Science
盲法
None

入排标准

年龄范围
18 Years 至 80 Years(Adult, Older Adult)
性别
All
接受健康志愿者

入选标准

  • Men and women age 18-65 who are current or former smokers
  • Serum calcium<10.5mg/dL
  • 25-Hydroxy Vitamin D (OHD)<20 ng/mL
  • Creatinine Clearance ≥60 mL/min as estimated by the Cockcroft-Gault equation
  • Women of reproductive potential with negative serum or urine pregnancy test and subjects must refrain from participating in a conception process and subject/partner must use at least 2 reliable forms of contraceptives for the duration of the study
  • For participants with COPD, Forced Expiratory Volume in 1 second (FEV1) greater than 50% predicted.
  • For smokers, current cigarette use (defined as regularly smoking 5 cigarettes per day)

排除标准

  • Current use of vitamin D supplements
  • Known allergy/sensitivity or any hypersensitivity to components of study drugs or their formulations
  • Pregnancy or currently breast-feeding
  • History of nephrolithiasis
  • HIV positive serostatus
  • Continuous oxygen use >2 liters/min via nasal cannula
  • Any condition that, in the opinion of the site investigator, would compromise the subject's ability to participate in the study.

研究组 & 干预措施

Vitamin D3

Experimental

Oral supplementation with 50,000 IU vitamin D3 weekly for eight weeks

干预措施: Vitamin D3 (Drug)

结局指标

主要结局

Change From Baseline in Lung Cathelicidin Level at 8 Weeks

时间窗: Baseline and 8 weeks

Change from baseline to 8 weeks in bronchoscopic lavage lung cathelicidin levels after vitamin D supplementation (comparison between pre- and post-supplementation cathelicidin levels using paired t-tests for repeated measures)

次要结局

  • Change From Baseline in Blood Cathelicidin at 8 Weeks(Baseline and 8 weeks)
  • Change From Baseline in Blood Vitamin D Binding Protein at 8 Weeks(Baseline and 8 weeks)

研究者

申办方类型
Other
责任方
Sponsor

研究点 (2)

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