Photoreceptors and Calcium Book by Wolfgang Baehr
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Photoreceptors and Calcium

Photoreceptors and Calcium


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About the Book

2 The role of Ca+ as an internal messenger in visual transduction of vertebrate and invertebrate organisms has been explored intensely in the recent past. Since the 2 early 1970s, calcium ions and cyclic GMP (whose levels are controlled by Ca+ in vertebrates) have been recognized as important second messengers. Particularly in 2 the last decade, however, the role of Ca+ in visual transduction has been re-evalu- ated and a proliferation of research has documented a multiplicity of roles. 2 It is now evident that Ca+ modulates phototransduction by acting at several 2 sites through a host of small Ca+ -binding proteins. For example, in phototransduction 2 of vertebrates, Ca+-free forms of guanylate cyclase activating proteins (GCAPs) activate guanylate cyclase, modulating levels of cOMP, a key event in the return of photoreceptors to pre-bleach conditions. Defects in genes encoding guanylate cy- clase or guanylate cyclase activating proteins lead to severe diseases of the retina (e. g., Leber congenital amaurosis, rod/cone dystrophy, or cone dystrophy), thus em- phasizing the important role of these proteins in phototransduction. Similarly, mu- 2 tant genes encoding cation or Ca+ channels (cyclic nucleotide-gated cation chan- 2 nels located in the cell membrane and L-type voltage-gated Ca+ channels located at the synapse of photo receptors) lead to retinitis pigmentosa or congenital stationary night blindness. In phototransduction of invertebrate organisms (e. g., Drosophila 2 and Limulus), the role of Ca+ is similarly central, but distinct, from that of vertebrates.


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Product Details
  • ISBN-13: 9781461349334
  • Publisher: Springer
  • Publisher Imprint: Springer
  • Edition: Softcover reprint of the original 1st ed. 2002
  • Language: English
  • Returnable: Y
  • Spine Width: 34 mm
  • Width: 178 mm
  • ISBN-10: 1461349338
  • Publisher Date: 08 Dec 2012
  • Binding: Paperback
  • Height: 254 mm
  • No of Pages: 625
  • Series Title: Advances in Experimental Medicine and Biology
  • Weight: 1169 gr


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