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Published on: September 18, 2011
Gliotoxin treatment selectively spares M-CSF- plus IL-3-responsive multipotent haemopoietic progenitor cells in bone
M Kobayashi1, A Müllbacher, P Waring
1Division of Clinical Sciences, John Curtin School of Medical Research, Australian National University, Canberra.
Abstract:
Gliotoxin, an epipolythiodioxopiperazine, is a fungal metabolite that causes genomic DNA degradation preferentially in certain blood cell types including T lymphocytes and macrophages. Gliotoxin has previously been used to treat murine allogeneic bone marrow prior to transplantation into irradiated recipients, and in this situation the drug prevents development of graft-versus-host disease, and permits the establishment of allogeneic bone marrow chimeras. We have examined the nature of the cells that survive gliotoxin treatment and report here that gliotoxin selectively spares a unique class of haemopoietic stem cell that forms large (HPP) colonies in the presence of mixtures of M-CSF and IL-3. We confirm that the cells which survive gliotoxin treatment are capable of reconstituting the haemopoietic system in allogeneic lethally irradiated mice.
Insights
Gliotoxin selectively spares a unique class of hematopoietic stem cells (HSCs) that can reconstitute the blood system. These gliotoxin-resistant HSCs form large colonies, offering potential for bone marrow transplantation therapies.
Area of Science:
- Immunology
- Hematology
- Mycology
Background:
- Gliotoxin, a fungal metabolite, induces DNA degradation in immune cells like T lymphocytes and macrophages.
- Previous studies utilized gliotoxin to prevent graft-versus-host disease in murine bone marrow transplantation models.
Purpose of the Study:
- To investigate the characteristics of cells that survive gliotoxin treatment.
- To identify specific hematopoietic stem cell populations resistant to gliotoxin.
Main Methods:
- Treatment of murine bone marrow cells with gliotoxin.
- Colony formation assays using M-CSF and IL-3 to assess stem cell potential.
- Assessment of hematopoietic reconstitution in allogeneic irradiated mice.
Main Results:
- Gliotoxin treatment selectively spares a unique population of hematopoietic stem cells.
- These surviving stem cells form high proliferation (HPP) colonies in vitro.
- The gliotoxin-resistant stem cells successfully reconstituted the hematopoietic system in vivo.
Conclusions:
- Gliotoxin exhibits selective toxicity towards specific blood cell types, sparing a distinct HSC population.
- This resistant HSC population possesses high self-renewal and differentiation capacity.
- The findings suggest potential therapeutic applications for gliotoxin-resistant HSCs in bone marrow transplantation.
