An-Najah National University

Belal Mahmoud M. Rahhal

 

 
  • Wednesday, April 1, 2009
  • In vivo requirement of TGF-β/GDNF cooperativity in mouse development: focus on the neurotrophic hypothesis
  • Published at:International Journal of Developmental Neuroscience
  • Neurotrophic factors are well-recognized extracellular signaling molecules that regulate neuron development including neurite growth, survival and maturation of neuronal phenotypes in the central and peripheral nervous system. Previous studies have suggested that TGF-β plays a key role in the regulation of neuron survival and death and potentiates the neurotrophic activity of several neurotrophic factors, most strikingly of GDNF. To test the physiological relevance of this finding, TGF-β2/GDNF double mutant (d-ko) mice were generated. Double mutant mice die at birth like single mutants due to kidney agenesis (GDNF−/−) and congential cyanosis (TGF-β2−/−), respectively. To test for the in vivo relevance of TGF-β2/GDNF cooperativity to regulate neuron survival, mesencephalic dopaminergic neurons, lumbar motoneurons, as well as neurons of the lumbar dorsal root ganglion and the superior cervical ganglion were investigated. No loss of mesencephalic dopaminergic neurons w
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  • Thursday, April 17, 2008
  • Transforming growth factor beta cooperates with persephin for dopaminergic phenotype induction.
  • Published at:Stem Cells
  • 1: Stem Cells. 2008 Jul;26(7):1683-94. Epub 2008 Apr 17.
    Transforming growth factor beta cooperates with persephin for dopaminergic phenotype induction. Roussa E, Oehlke O, Rahhal B, Heermann S, Heidrich S, Wiehle M, Krieglstein K. aDepartment for Neuroanatomy, Georg-August-University Goettingen, Goettingen, Germany. eroussa@gwdg.de
    The aim of the present study was to investigate the putative cooperative effects of transforming growth factor beta (TGF-beta) and glial cell line-derived neurotrophic factor (GDNF) family ligands in the differentiation of midbrain progenitors toward a dopaminergic phenotype. Therefore, a mouse midbrain embryonic day (E) 12 neurospheres culture was used as an experimental model. We show that neurturin and persephin (PSPN), but not GDNF, are capable of transient induction of dopaminergic neurons in vitro. This process, however, requires the presence of endogenous TGF-beta. In contrast, after 8 days in vitro GDNF rescued the TGF-beta neutralization-dependent los
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  • Monday, November 15, 2004
  • Isoform-specific role of transforming growth factor-beta2 in the regulation of proliferation and differentiation of murine adrenal chromaffin cells in vivo.
  • Published at:J. Neuroscience Research
  • 1: J Neurosci Res. 2004 Nov 15;78(4):493-8.
    Isoform-specific role of transforming growth factor-beta2 in the regulation of proliferation and differentiation of murine adrenal chromaffin cells in vivo. Rahhal B, Dünker N, Combs S, Krieglstein K. Department of Neuroanatomy, Medical Faculty, University Goettingen, D-37075 Goettingen, Germany.
    Chromaffin cells, the neuroendocrine cells of the adrenal medulla, play an important role in molecular, cellular, and developmental neurobiology. Unlike the closely related sympathetic neurons, chromaffin cells are able to proliferate throughout their whole life span. Proliferation of chromaffin cells in vivo is thought to be regulated by the interaction of neurogenic and hormonal signals. Previous studies have shown that chromaffin cells synthesize and release transforming growth factor-betas (TGF-betas). In the present study, effects of TGF-betas on proliferation and differentiation of chromaffin cells in mouse adrenal chromaffin cells were investi
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PROFILE

Belal Mahmoud M. Rahhal
Human Anatomy and Physiology
 
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