Pilot Study: Effects of G-CSF on T Cell Function

Completed

Conditions studied: Healthy

In brief

This study will evaluate changes in T cells-infection-fighting white blood cells of the immune system-in people given a drug called G-CSF before donating stem cells (immature bone marrow cells) for transplantation. Originally, bone marrow cells were obtained using a needle inserted into the hipbone of the donor. However, when it was discovered that immature bone marrow cells also circulate in the blood, scientists began to develop techniques to collect quantities of these cells from the blood instead of the bone. G-CSF is a blood cell growth factor that pushes stem cells from the bone marrow into the bloodstream. Stem cell donors are given this drug 5 to 6 days before donation to make more cells available in the circulating blood for collection. Stem cell transplantation requires careful regulation of immune cell function to allow the donated stem cells to grow in the transplant recipient, to prevent the transplanted cells from damaging the recipient, and to allow the recipient's new immune system to develop normally so it can fight infections. Studies comparing the outcome of patients transplanted with bone marrow cells with those transplanted with stem cells suggest that the G-CSF given to stem cell donors affects the function of T cells in transplant recipients. This study will collect white cells containing T cells before and after G-CSF administration to determine the effects of the drug on both T cells and stem cells. Healthy normal volunteers 18 years of age and older who meet the health criteria for donating blood may participate in this study. Pregnant and breastfeeding women are not eligible. Participants will undergo the following procedures: * Blood sample collection (15 milliliters, or 3 teaspoons) to measure blood cell counts * Electrocardiogram to assess heart function * Apheresis to donate white blood cells. Participants will undergo two apheresis procedures-once before receiving G-CSF and a second time immediately after finishing the 5-day course of the drug. For this procedure, whole blood is removed using a needle placed in an arm vein. The blood is circulated through a cell separator machine, where the white cells are removed and collected in a plastic bag. The rest of the blood, including the red cells, platelets, and plasma, are returned to the donor through a needle in the other arm. The procedure takes 2 to 3 hours, during which time the donor lies quietly.

Key facts

Study ID: NCT00039650
Run by: National Institutes of Health Clinical Center (CC)
People needed: 15
Starts: 2002-05-01
Expected to finish: 2004-03-01
Last updated by the study team: 2008-03-04

Who can join

Age: any. Sex: any. Healthy volunteers: accepted.

You may qualify if…

Both male and female subjects will be studied.
Subjects will be enrolled without regard to their ethnic group.
Only adults and children 18 years of age or older will be studied.
Subjects must weigh at least 110 pounds.

You may not qualify if…

Any subject that does not pass the health criteria for blood donors established by the American Association of Blood Banks will be excluded.
Subjects will be excluded if they have any of the following conditions: pregnancy, uncontrolled hypertension, heart disease, history of allergic reactions to G-CSF, history of allergic reactions to E. coli, abnormal hemoglobin or white blood cell counts, a malignancy, or asthma.
Subjects with family members with conditions that may require a transplant in the future will be excluded.
Subjects with an enlarged spleen by history or physical exam will be excluded.
Subjects with hemoglobin less than 12.5 or greater than 19.0 gm/dL, platelet counts less than 150 x 10(9)/L or greater than 500 x 10(9)/L and an absolute neutrophil count of less than 1.5 x 10(9)/L or greater than 10.0 x 10(9)/L will not be eligible.
Subjects with an abnormal EKG will be excluded from the study.
Pregnant and lactating women will be excluded.
If a subject's veins are judged to be too small to support the intravenous catheter required for the procedure, they will be excluded.
If at the time of each apheresis procedure the nurses are unable to obtain adequate antecubital vein access, the subject will be excluded.

Where it is running

Warren G. Magnuson Clinical Center (CC) — Bethesda, Maryland, United States

Full record on ClinicalTrials.gov

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