Thiol/Disulphide Homeostasis in Unexplained Infertility

The Role of Thiol/Disulphide Homeostasis in Unexplained Primary Infertile Patients

The aim in this study is to determine whether there is a relationship between Thiol / Disulphide levels in primary infertile patients and comparing them with infertile patients and the control group. For this purpose, 41 women followed up with the diagnosis of primary infertility in Siirt Training and Research Hospital between November 2022 and January 2023 will be included in the study. The same number of (n:41) non-infertile control women will be included. Age, pregnancy history and medical history of both groups will be recorded. FSH, LH, E2, TSH, and prolactin levels taken routinely in these patients will be examined. Thiol/disulphide levels in the blood will be checked by taking whole blood from these patients. In the light of the information thus obtained, the investigator plan to determine whether there is a relationship between oxidant/antioxidant balance in primary infertile patients.

Study Overview

• Status: Completed
• Conditions: Infertility; Oxidative Stress; Antioxidative Stress
• Intervention / Treatment: Other: complete blood count

Detailed Description

Reactive oxygen species (ROS) are products of normal cellular metabolism and consist of oxygen ions, free radicals and peroxides. Adding an electron to oxygen creates the superoxide anion radical, which can then be converted to a hydroxyl radical, peroxyl radical, or hydrogen peroxide. Free radicals try to participate in chemical reactions that free themselves of their unpaired electrons and result in oxidation. Natural antioxidants found in the body include catalase, glutathione peroxidase, superoxide dismutase and glutathione reductase, vitamins C and E, ferritin, and transferrin. Other lifestyle factors such as smoking, diet, illness, pollution, stress, alcohol, and allergies also contribute to increased levels of free radicals, suggesting that these factors have a negative impact on female fertility, potentially through the formation of excessive oxidative stress.

Excessive accumulation of ROS can damage cells, proteins, DNA and lipids; therefore, ROS levels are regulated by antioxidant mechanisms in the organism. A shift in the direction of ROS in this balance is called oxidative stress (OS). ROS produced in the follicle have important roles in folliculogenesis and ovulation. Granulosa cells produce antioxidants to protect oocytes from the harmful effects of excess ROS. OS has been implicated as an etiopathogenetic factor in female infertility. The number of studies examining the role of OS in the etiopathogenesis of infertility has increased in recent years, and it has been suggested that increased OS and/or decreased antioxidant defense mechanisms may contribute to infertility-related conditions.

One of the defense mechanisms against OS in humans is the thiol redox reaction. The thiol consists of a sulfhydryl group, and under OS conditions these functional groups form reversible disulfide bridges. These bonds bring about functional and structural changes in proteins. Disulfide bonds are reduced to thiol groups through antioxidant mechanisms, thereby providing thiol/disulfide homeostasis. Thus, disulfide bridges are thought to be a marker of OS, while thiols are suggested to be members of the antioxidant system. Only one side of this equilibrium has been measured by Ellman (1979), whereas in recent years both sides of the thiol/disulfide equilibrium can be measured by the Erel and Neselioğlu assay method, allowing a full assessment of the thiol/disulfide status.

Dynamic thiol/disulfide homeostasis, a recently identified marker of OS, is thought to have critical roles in pathological processes in various vital processes such as folliculogenesis and ovulation.

n the literature review, there are studies investigating the relationship between infertility and oxidant/antioxidants. However, measurements require measuring a large number of parameters and many separate biomarkers. The thiol/disulfide balance is beneficial in terms of showing the oxidant/antioxidant balance in total. It was not possible to measure this balance simultaneously on both sides in the method measuring the thiol/disulfide balance by Newman in 1979. In recent years, it has become possible to measure the serum Thiol/disulfide balance bilaterally with the automatic spectrophotometric method described by Erel and Neşelioğlu. This study aims to investigate whether there is a relationship by measuring the Total oxidant/antioxidant load with the Thiol/disulfide method in patients with unexplained infertility, to investigate the relationship between thiol/disulfide homeostasis and impaired ovulation and fertility, and to analyze the potential pathogenetic mechanism.

• Study Type: Observational
• Enrollment (Actual): 82

Contacts and Locations

• Study Contact: Name: Şerif Aksin, assis prof; Phone Number: 0090 5052774937; Email: serifaksin1@gmail.com
• Study Contact Backup: Name: Mehmet Yılmaz, Dr; Phone Number: 0090 5326878134; Email: jindrmehmet@gmail.com

Study Locations

• Turkey
  • Siirt, Turkey, 56000
    • Siirt Üniversity Medical Faculty

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 35 years (Adult)
• Accepts Healthy Volunteers: No

• Sampling Method: Non-Probability Sample

Study Population

Women between the age of 18-35 diagnosed with infertility of unknown cause.

Description

Inclusion Criteria:

• Patients diagnosed with primary infertility
• Patients between the age of 18-35

Exclusion Criteria:

• Active hypertension
• Chronic liver or kidney failure history
• Coronary artery disease
• Acute infection (within 14 days)
• Any chronic inflammatory disease
• Presence of autoimmune disease
• Known malignancy
• Inflammatory bowel disease
• Hormonal contraception
• Smoking
• alcohol use
• Drug use
• Patients with tubal infertility
• Partner with abnormal spermiogram

Study Plan

How is the study designed?

Design Details

• Observational Models: Cohort
• Time Perspectives: Prospective

Number of groups / cohorts

2

Cohorts and Interventions

Group / Cohort	Intervention / Treatment
Women diagnosed with primary infertility (n:41); Women which followed up with infertility of unknown cause.	Other: complete blood count; Thiol/disulphide levels in the blood will be checked by taking complete blood count
Control group ( n:41); Healthy women who are not infertile	Other: complete blood count; Thiol/disulphide levels in the blood will be checked by taking complete blood count

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Measuring the total oxidant/antioxidant load with the Thiol/disulfide method in patients with unexplained infertility	To determine whether there is a relationship between oxidant/ antioxidant balance in primary infertile patients by looking at Thiol/disulphide blood levels in both groups.	"through study completion, an average of 4 months

Collaborators and Investigators

• Sponsor: Siirt University

Study record dates

Study Major Dates

• Study Start (Actual): November 30, 2022
• Primary Completion (Actual): April 21, 2023
• Study Completion (Actual): April 21, 2023

Study Registration Dates

• First Submitted: November 7, 2022
• First Submitted That Met QC Criteria: November 16, 2022
• First Posted (Actual): November 29, 2022

Study Record Updates

• Last Update Posted (Actual): April 25, 2023
• Last Update Submitted That Met QC Criteria: April 21, 2023
• Last Verified: April 1, 2023

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Infertility
• Other Study ID Numbers: SiirtUNIVERSI

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No