@article {Noack1_2015, year = {2015}, author = {Noack, Monika and Richter-Landsberg, Christiane}, title = {Activation of autophagy by rapamycin does not protect oligodendrocytes against protein aggregate formation and cell death induced by proteasomal inhibition}, journal = {Journal of molecular neuroscience : JMN online}, volume = {55.2015}, number = {1}, DOI = {10.1007/s12031-014-0380-x}, ISSN = {1559-1166}, URL = {http://dx.doi.org/10.1007/s12031-014-0380-x}, abstract = {Rod outer segment guanylate cyclase 1 (ROS-GC1) is a pivotal enzyme for vertebrate phototransduction and the systematically growing evidence point to its connection with processes other than phototransduction within and outside the retina. ROS-GC1 activity is regulated by Ca2+ in two opposite modes. This regulation is indirect and occurs through Ca2+-binding proteins. At nanomolar Ca2+ concentrations, ROS-GC1 is activated by GCAPs and at micromolar Ca2+-concentrations, by S100β and neurocalcin. The former mode operates in phototransduction and the latter was proposed to play a role in synaptic activity. The last possibility was supported by findings of ROS-GC1 expression not only in various retinal layers other than photoreceptor outer segments but also outside the retina, in pineal gland and olfactory bulb. If ROS-GC1 indeed is to play a role in neurotransmission its expression must be colocalized with its Ca2+-dependent regulators and with possible targets of an increased cyclic GMP concentration, cyclic nucleotide-gated channels or cyclic GMP-dependent protein kinase, in synaptic regions. In this review these aspects of ROS-GC1 expression in retina, pineal gland and olfactory bulb are discussed.}, note = {eng} }