Does transmembrane communication through gap junctions enable stem cells to overcome stromal inhibition?
When long-term bone marrow cultures are treated with Amphotericin B (AB) their haemopoietic stem cells (HSC) cease growing. This is not a toxic effect of the drug because once that is removed, HSC resume clonal growth and, given sufficient time, form as many cells as HSC in untreated cultures. Amphotericin B-evoked inhibition of blood formation is probably mediated by transmembrane communication between HSC and stroma for the following reasons: (1) AB does not stop HSC forming colony-forming units in culture (CFU-c) when HSC are separated from stroma by culturing them on Transwell inserts above the stroma. (2) Conditioned media (CM) from AB-containing or normal long-term cultures (LTC) does not inhibit normal marrow cells forming colonies in semi-solid cultures without stromal underlays. (3) AB itself does not stop bone marrow cells forming colonies in semi-solid cultures nor does it stop stromal cells growing or prejudice their long-term maintenance. (4) Furthermore, growing stromal c
Related Questions
- What are the potential uses of human stem cells and the obstacles that must be overcome before these potential uses will be realised?
- Does transmembrane communication through gap junctions enable stem cells to overcome stromal inhibition?
- Is intercellular communication via gap junctions required for myoblast fusion?