The Effect of Hyperbaric Oxygen Therapy on Circulating Hematopoietic Stem Cell Population

April 16, 2026 updated by: Shay Efrati, Assaf-Harofeh Medical Center

The Effect of Hyperbaric Oxygen Therapy (HBOT) on Circulating Hematopoietic Stem Cell Population , A Prospective Study

Hematopoietic stem cells (HSCs), which govern the production of all blood lineages, transition through a series of functional states characterized by expansion during fetal development, functional quiescence in adulthood, and decline upon aging.

Although research on aging has for a long time been relatively descriptive, much progress has been made in the past decade to uncover the molecular drivers of biological aging. One such drivers relates to stem cell exhaustion.

The amount and the function of HSCs decline in humans along aging. This decline is characterized by different changes such as signaling, epigenetic, cell surface markers etc. Various studies have been conducted to identify HSCs surface markers using flow cytometry.

Exposure to Hyperbaric Oxygen Therapy (HBOT) induce stem cells proliferation mobilization of stem progenitor cells (SPCs) in both animal and humans studies, and the number of SPCs remain elevated in blood over the course of 20 HBOT .

Additionally, Heyboer et al have found dose response curve between the HBOT protocol and circulating CD34+ and CD45-dim (stem cells potential markers): increasing the treatment pressure from 2.0 ATA to 2.5 ATA increased the concentration of circulating stem cells.

The aim of the current study is to evaluate the effect of HBOT on circulating hematopoietic stem cells, in the peripheral blood of patients who are candidate for HBOT.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

60

Phase

  • Not Applicable

Contacts and Locations

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

Study Contact

Study Locations

  • Israel
      • Zrifin, Israel, 70300
        • Recruiting
        • The Sagol Center for Hyperbaric Medicine and Research Shamir Medical Center (Assaf Harofeh)
        • Contact:

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

  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • The study will include patients aged 20-80 who are intendent to start HBOT for other indication that are willing to give blood samples for measurements of circulating stem cells.

Exclusion Criteria:

  1. Active or recent infection within the last month
  2. Active malignancy.
  3. History of hematopoietic disease
  4. Low B12 or iron levels
  5. Inability to sign the informed consent form
  6. Leucocytes ˂4000 or ˃10,000

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

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Hyperbaric oxygen therapy (HBOT) active treatment
The HBOT protocol is 90 minutes, 5 times/week, for at least 40 sessions, 100% oxygen at 2 ATA with five-minute air breaks every 20 minutes
Device: Hyperbaric Oxygen Therapy
The HBOT protocol is 90 minutes, 5 times/week, for at least 40 sessions, 100% oxygen at 2 ATA with five-minute air breaks every 20 minutes. Investigational product: Multiplace hyperbaric oxygen chamber (Haux Starmed 2700, Germany) located at the Sagol center for hyperbaric medicine and research, Shamir (Assaf-Harofeh) Medical Center, Israel.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
hematopoietic stem cells evaluation
Time Frame: Change from Baseline immediately after the intervention
Blood test will be withdrawn for hematopoietic stem cells evaluation, CBC and chemistry. Evaluation of the hematopoietic stem cells population in PBMCs in different HBOT time points. Hematopoietic Stem cells will be identified by Flow cytometry immunostaining with the following markers: CD34, CD38- , CD45, CD45RA and CD90. A negative control will be an unstained tube and a tube containing CD45+CD34+ and CD38+, a positive control will be the Isotope control for each marker. The tube including the CD38- marker will be specific for the stem cells population.
Change from Baseline immediately after the intervention

Collaborators and Investigators

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

Sponsor

Assaf-Harofeh Medical Center

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 (Actual)

March 5, 2025

Primary Completion (Estimated)

December 30, 2027

Study Completion (Estimated)

December 30, 2027

Study Registration Dates

First Submitted

December 19, 2024

First Submitted That Met QC Criteria

December 19, 2024

First Posted (Actual)

December 27, 2024

Study Record Updates

Last Update Posted (Actual)

April 21, 2026

Last Update Submitted That Met QC Criteria

April 16, 2026

Last Verified

April 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 0165-24

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

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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