Methods of screening biological agents
The invention discloses methods of proliferation and differentiation of multipotent neural stem cells. Also provided are methods of making cDNA libraries and methods of screening biological agents which affect proliferation differentiation survival phenotype or function of CNS cells.
1. A method for screening biological agents which affect proliferation, differentiation, survival, phenotype, or function of CNS cells, comprising:
a) preparing an adherent cell culture of an undifferentiated neural cell population comprising multipotent neural stem cells, wherein a single multipotent neural stem cell is capable of producing progeny that are capable of differentiating into neurons and glia, including astrocytes;
b) contacting said neural cell population with at least one biological agent, and
c) determining if said biological agent has an effect on proliferation, differentiation, survival, phenotype, or function of said neural cell population.
2. The method of claim 1 , wherein step c) comprises determining the effects of said biological agent on differentiation of said neural cell population.
3. The method of claim 1 further comprising the step of inducing differentiation of said neural cell population prior to performing step b).
4. The method of claim 1 , wherein the source of said multipotent neural stem cells is a human.
5. The method of claim 1 , wherein said biological agent is a growth factor selected from the group consisting of fibroblast growth factor-1 (FGF-1), FGF-2, epidermal growth factor (EGF), EGF-like ligands, transforming growth factor-α (TGFα), insulin-like growth factor (IGF-1), nerve growth factor (NGF), platelet-derived growth factor (PDGF), and TGFβs.
6. The method of claim 1 , wherein said biological agent is a trophic factor selected from the group consisting of brain-derived neurotrophic factor (BDNF), ciliary neurotrophic factor (CNTF), and glial-derived neurotrophic factor (GDNF).
7. The method of claim 1 , wherein said biological agent is a regulatory factor selected from the group consisting of phorbol 12-myristate 13-acetate, stauroporine, CGF-41251, tyrphostin, compounds which interfere with activation of the c-fos pathway, compounds which suppress tyrosine kinase activation, and heparan sulfate.
8. The method of claim 1 , wherein said biological agent is a hormone selected from the group consisting of activin and thyrotropin releasing hormone (TRH).
9. The method of claim 1 , wherein said biological agent is a macrophage inflammatory protein (MIP) selected from the group consisting of MIP-1α, MIP-1β, and MIP-2.
10. The method of claim 1 , wherein the effect of the biological agent on proliferation of the neural cell population is determined by observing changes in size or number of the multipotent neural stem cells.
11. The method of claim 1 , wherein the source of said multipotent neural stem cells is a fetal mammal.