Download e-book for iPad: Aging and Age Related Ocular Diseases (Ophthalmologica, 1) by E. Lütjen-Drecoll

By E. Lütjen-Drecoll

ISBN-10: 3805570384

ISBN-13: 9783805570381

The phenomenon of getting older is characterised via a variety of degenerative alterations, which differentially impact the hugely really expert constructions in the eye, resembling the merely mobile lens, the brain-derived retina and the connective tissue of the uvea and sclera. consequently, the attention can function a superb version process to review age-related degenerative illnesses. an outline article offers with the molecular biology of alpha-B-crystallin, and unique articles supply extra perception into the distribution and attainable practical value of nonlenticular alpha-B-crystallin. Retinal transplantation stories that can eventually bring about remedy for tapetoretinal degeneration and age-related macular degeneration are mentioned. extra, elements that impact the advance of the retinal tissues are investigated. And one other assessment examines cells of the deep lens fibers. This specified factor is an in-depth resource of data to ophthalmologists in examine and perform.

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The muscarinergic agonist pilocarpine, which contracts trabecular meshwork, reduced ocular outflow. 100 n = 10 90 80 Cellular Contractions On a cellular level using cultivated trabecular meshwork cells, changes in shape indicating contractile processes have also been observed. Agents that have been shown to decrease the area of trabecular meshwork cells include the vasoactive compounds bradykinin [92] and acetylcholine [21], as well as ethacrynic acid, colchicine and vinblastine [81, 93, 94], all of which are known to disrupt the cytoskeleton.

Endothelin 1, a potent vasoactive agent that contracts trabecular meshwork strips [46], also reduced ocular outflow. Bradykinin is generated by the action of the kallikrein-kinin system and known for its vasoactive properties. Intracameral administration of bradykinin is known to increase intraocular pressure [98] and to contract smooth-muscle tissue; in accordance with this, a drop in outflow facility in the model of the perfused anterior segment was observed [92]. As in the contractility experiments, the net effect of epinephrine depended on the concentration used [28].

The use of different muscarinic receptor subtype antagonists has revealed that the M3 receptor subtype is the most important receptor involved [22]. In addition, it was possible to show that phosphoinositide production was stimulated as a result of the stimulation of muscarinic receptors, with subsequent activation of the phospholipase C system. Subsequent research demonstrates a rise in calcium in response to the application of various neuropeptides (neuropeptide Y, substance P, bombesin, calcitonin gene-related peptide, vasoactive intestinal peptide) in trabecular meshwork cells [106].

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Aging and Age Related Ocular Diseases (Ophthalmologica, 1) by E. Lütjen-Drecoll

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