Friday, 22 November 2013

Another repair factor delivered in a stem cells

Yang J, Yan Y, Xia Y, Kang T, Li X, Ciric B, Xu H, Rostami A, Zhang GX.Neurotrophin 3 Transduction Augments Remyelinating and Immunomodulatory Capacity of Neural Stem Cells. Mol Ther. 2013 Oct 17. doi: 10.1038/mt.2013.241. [Epub ahead of print]


Neural stem cells (NSCs) have therapeutic potential in experimental autoimmune encephalomyelitis (EAE), an animal model of multiple sclerosis(MS); however, to date, their use has resulted in only limited clinical and pathological improvement. To enhance their therapeutic capacity, in the present study, we transduced bone marrow-derived NSCs (BM-NSCs) with neurotrophin 3 (NT-3), a potent neurotrophic factor that is both neuroprotective and immunomodulatory. We found that BM-NSCs transduced with NT-3 reduced central nervous system (CNS) inflammation and neurological deficits in ongoing EAE significantly more than conventional NSC therapy, and, in addition, had the following advantages: (i) enhanced BM-NSC proliferation and differentiation into oligodendrocytes and neurons, as well as inhibited differentiation into astrocytes, thus promoting remyelination and neuronal repopulation, and reducing astrogliosis; (ii) enhanced anti-inflammatory capacity of BM-NSCs, thus more effectively suppressing CNS inflammation and accelerating remyelination; (iii) the easy accessibility of BM-NSCs provides another advantage over brain-derived NSCs for MS therapy; and (iv) a novel Tet-on system we used enables efficient control of NT-3 expression. Thus, our study provides a novel approach to break the vicious inflammation-demyelination cycle, and could pave the way to an easily accessible and highly effective therapy for CNS inflammatory demyelination.



Well yet another target for promoting repair. Neurotrophin-3 is
is a neurotrophic factor in the NGF (Nerve Growth Factor) family of neurotrophins. It is a protein growth factor which has activity on certain neurons of the peripheral and central nervous system; it helps to support the survival and differentiation of existing neurons, and encourages the growth and differentiation of new neurons and synapses. This approach genetically engineers stem cells to produce a remyelinating factor and these work better than non-transfected cells. TeamG have investigated his approach for other molecules to get goodies into the brain using this Trojan Horse effect. However, this is still a bit more science fantasy rather than science reality for clinical use.

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