Crossover Study on Human Exposure to Phthalates and Male Fertility
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 130
- 试验地点
- 1
- 主要终点
- Altered semen quality and sperm transcriptome analysis
研究概览
简要总结
The purpose of this study is to investigate the relationship of high exposure to dibutyl phthalate (DBP) from the use of Asacol with clinical and intermediate markers of male fertility, including semen quality, sperm DNA damage, transcript profiles of sperm mRNA and sncRNAs, and reproductive hormones.
Hypothesis 1: High exposure to DBP from the use of Asacol is associated with decreased sperm concentration and motility, and increased sperm DNA damage.
Hypothesis 2: High exposure to DBP from the use of Asacol is associated with decreased serum testosterone, altered LH:testosterone ratio, and decreased inhibin-B.
Hypothesis 3: High exposure to DBP from the use of Asacol is associated with altered transcript profiles of sperm mRNAs and sncRNAs.
详细描述
There are 2 ways you can participate in the study.
OPTION 1 involves 6 one-hour visits to the Massachusetts General Hospital (MGH) Andrology Clinic over a 9 month period. At each visit you would be asked to fill out questionnaires and to provide a urine, semen, and blood sample. Following Visit 2, you are asked to switch your brand of mesalamine medication. After 4 months, you change back to your original brand of medication. The change in medication will be done in consultation with your primary GI doctor. If the cost of co-payment is greater for the new brand of medication, we will provide compensation to cover the difference. In the case you do not have prescription drug health insurance coverage, the study will reimburse up to $4000 to cover the cost for Asacol, Pentasa or Lialda medication taken during your study participation.
OPTION 2 involves 4 one-hour visits to MGH Andrology clinic. At each visit you complete questionnaires and provide a blood, urine and semen sample. You are eligible for Option 2 if you are currently taking Asacol or Asacol HD and do not want to change your medication.
研究设计
- 研究类型
- Observational
- 观察模型
- Case Crossover
- 时间视角
- Prospective
入排标准
- 年龄范围
- 18 Years 至 55 Years（Adult）
- 性别
- Male
- 接受健康志愿者
- 否
入选标准
- •Must be taking mesalamine medication. Willing to switch brand of medication for 4 months or currently taking Asacol or Asacol HD.
- •Has not taken steroid medication within the previous 3 months. Is able to come to MGH hospital for 6 visits.
排除标准
- •Is not taking mesalamine medication. Unwilling to switch brand of medication for 4 months.
- •Is or has taken steroid medication within the past 3 months. Is unable to come to MGH hospital for 6 visits.
- •Has had a vasectomy or has documented infertility.
结局指标
主要结局
Altered semen quality and sperm transcriptome analysis
时间窗: Initial analysis takes place approximately 4-5 months after patient enrolls and after he has completed first crossover of medication. The second phase takes place about 8-10 months later after he crosses back to original medication.
次要结局
- Serum levels of reproductive hormones(Analysis of hormone levels take place at the same intervals described above, 4-5 months after enrollment and then again 8-10 months after enrollment when patient has resumed taking orginal medication.)
研究者
Russ Hauser
Principal Investigator
Harvard School of Public Health (HSPH)