Cellular Biotechnology

Molecular and cellular neurobiotechnology

Prof. Dr. del Río, José Antonio
Group Leader


Edifici Hèlix | Baldiri Reixac, 15-21 | 08028 | Barcelona
Email : jadelrioibecbarcelona.eu

Research Topics

Atomic force microscopy / Microarrays analysis / Gene cloning and expression of developmentally regulated genes / Pharmacological treatments to promote axon regeneration / Prion biology / Neurodegenerative diseases / Neural stem cells

 

During 2012, the research group has developed several studies aimed at understanding some processes of development and neurodegeneration of the central nervous system (CNS).

Role of PrPc in the nervous system. We have demonstrated, in collaboration with other groups, the role of the cellular prion protein (PrPc) in neural stem cell proliferation and differentiation, in particular oligodendrocyte precursor cells (OPCs). Our data indicate that PrPc influences oligodendrocyte proliferation in the developing and adult CNS. OPCs that lack PrPc proliferate more vigorously at the expense of a delay in differentiation, which correlates with changes in the expression of oligodendrocyte lineage markers. In addition, numerous NG2-positive cells were observed in cortical regions of adult PrPc knockout mice, although no significant changes in myelination can be seen, probably due to the death of surplus cells (Bribian et al., 2012)

In addition, our data indicate that PrPc also modulate glutamatergic neutransmission by acting at the cell membrane together with the glutamate receptor subunits Glur6/7 and the postsynaptic density protein PSD-95. Thus the absence of PrPc induces epilepsy by lacking the interaction with the glutamate receptor. In addition, we demonstrated that an intracellular kinase JNK3 is a target of PrPc mediated signaling. These data have been included in a perspectives report in Prion (Llorens & Del Río, 2012).


Example of LEICA SP5 spinning disk confocal microscopy picture showing one example of hippocampus in the new mouse Cre/lox models generated by the group. In the example, labeled axons of CAMKII positive cells are labeled in yellow or green after recombination and fluorochrome switch.

 

 

NeuroMEMs. New platforms for neural culture and analysis. From the technological point of view, the group published a methodological review in Nature Protocols on the usefulness of three-dimensional culture with hydrogels in neurobiological studies. The method is easy and is generally reproducible and only few specific details can be taken into account during its development. The degree and behavior of axonal growth or neural migration can be seen directly by using eGFP transgenic mice as a source of neural tissue or by immunostaining (Gil & Del Río, 2012).

Regenerative neuroscience. Moreover, in collaboration with other IBEC groups, we have characterized the role of myelin-associated proteins and its intracellular signaling cascades in the development of cell therapies using olfactory ensheathing cells. These cells are inhibited by myelin. In collaboration with Xavier Trepat’s group we have determined for the first time the behavior of these cells using biomechanics and traction force analysis (Nocentini et al., 2012). Current experiments of our groups are directed to avoid this inhibition in order to increase the effectiveness of this cell type after spinal cord lesion.

Finally, group members have collaborated on the study of the analysis of Neuregulin-1/Erb4 signaling in OPCs migration (Ortega et al., 2012) as well the role of the Semaphorin 4F during its maturation (Armendariz et al., 2012).



Example of LEICA SP5 spinning disk confocal microscopy picture showing Cajal-Retzius cells (green) migrating in a hydrogel 3D culture.




Current experiments. Current experiments are directed to develop optogenetic non-invasive bioessays to analyze neuronal migration during brain development. In this collaboration with Ángel Raya’s group we have generated transgenic mice with the expression of switchable fluorochromes under specific promoters to label particular neural populations. In particular the migration of pioneer neurons, Cajal-Retzius cells, is already being analyzed using these transgenic mice.