Pilot Study: Effects of G-CSF on T Cell Function
|First Received Date ICMJE||June 6, 2002|
|Last Updated Date||March 3, 2008|
|Start Date ICMJE||May 2002|
|Primary Completion Date||Not Provided|
|Current Primary Outcome Measures ICMJE||Not Provided|
|Original Primary Outcome Measures ICMJE||Not Provided|
|Change History||Complete list of historical versions of study NCT00039650 on ClinicalTrials.gov Archive Site|
|Current Secondary Outcome Measures ICMJE||Not Provided|
|Original Secondary Outcome Measures ICMJE||Not Provided|
|Current Other Outcome Measures ICMJE||Not Provided|
|Original Other Outcome Measures ICMJE||Not Provided|
|Brief Title ICMJE||Pilot Study: Effects of G-CSF on T Cell Function|
|Official Title ICMJE||Pilot Study of the Effects of G-CSF on T Cell Function|
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:
T cells play a critical role in hematopoietic stem cell transplantation. Many transplant protocols involving HLA matched sibling donors make use of T cell mediated graft-versus-leukemia or graft-versus-cancer effects to clear and/or prevent the recurrent growth of malignant cells. Donor T cells are also responsible for reconstituting cellular immune function following transplantation, but often cause graft-versus-host disease (GVHD). Over the past several years the major source of hematopoietic stem cells for transplantation has changed from marrow to granulocyte-colony stimulating factor (G-CSF)-mobilized peripheral blood stem cells (PBSCs). Despite the fact that patients transplanted with allogeneic G-CSF-mobilized PBSCs receive approximately 10-fold more T-cells than those transplanted with marrow, the incidence and severity of acute GVHD is similar among the two groups, although chronic GVHD is higher in PBSC recipients. Using cellular function assays some investigators have shown that G-CSF affects T cell function. When healthy subjects are given G-CSF, a decrease is seen in the concentration of circulating type 1 helper T cells (Th1) with subsequent falls in the cytokine levels produced by these cells. In contrast, an increase occurs in the concentration of type 2 helper T cells (TH2) and the level of cytokines produced. The purpose of this study is to assess G-CSF-induced changes in T cells. cDNA microarrays will be used to compare genes expressed in CD4 and CD8 cells before and after G-CSF is given. Up to fifteen healthy subjects will be given a typical PBSC mobilization regimen for allogeneic transplants: 10 micrograms/kg/day of G-CSF for 5 days. Peripheral blood mononuclear cells will be collected by apheresis before the mobilization regimen is given and the day after the mobilization is complete. CD4, CD8, and CD34+ cells will be isolated from the peripheral blood mononuclear cells and gene expression will be assessed using cDNA microarrays containing over 8,000 genes.
|Study Type ICMJE||Observational|
|Study Design ICMJE||Not Provided|
|Target Follow-Up Duration||Not Provided|
|Sampling Method||Not Provided|
|Study Population||Not Provided|
|Intervention ICMJE||Not Provided|
|Study Group/Cohort (s)||Not Provided|
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Recruitment Status ICMJE||Completed|
|Completion Date||March 2004|
|Primary Completion Date||Not Provided|
|Eligibility Criteria ICMJE||
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.
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.
|Accepts Healthy Volunteers||Yes|
|Contacts ICMJE||Contact information is only displayed when the study is recruiting subjects|
|Location Countries ICMJE||United States|
|NCT Number ICMJE||NCT00039650|
|Other Study ID Numbers ICMJE||020201, 02-CC-0201|
|Has Data Monitoring Committee||Not Provided|
|Responsible Party||Not Provided|
|Study Sponsor ICMJE||National Institutes of Health Clinical Center (CC)|
|Collaborators ICMJE||Not Provided|
|Investigators ICMJE||Not Provided|
|Information Provided By||National Institutes of Health Clinical Center (CC)|
|Verification Date||March 2004|
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