Abstract:
:The activation of soluble guanylate cyclase by nitric oxide is increased in the frontal cortex but is reduced in the cerebellum of patients who died with liver cirrhosis. The aims of this work were to assess whether hyperammonemia is responsible for the region-selective alterations in guanylate cyclase modulation in liver cirrhosis and to assess whether the alteration occurs in neurons or in astrocytes. The activation of guanylate cyclase by nitric oxide was lower in cerebellar neurons exposed to ammonia (1.5-fold) than in control neurons (3.3-fold). The activation of guanylate cyclase by nitric oxide was higher in cortical neurons exposed to ammonia (8.7-fold) than in control neurons (5.5-fold). The activation was not affected in cerebellar or cortical astrocytes. These findings indicate that hyperammonemia is responsible for the differential alterations in the modulation of soluble guanylate cyclase in cerebellum and cerebral cortex of cirrhotic patients. Moreover, the alterations occur specifically in neurons and not in astrocytes.
journal_name
Neurobiol Disjournal_title
Neurobiology of diseaseauthors
Rodrigo R,Erceg S,Felipo Vdoi
10.1016/j.nbd.2004.12.001keywords:
subject
Has Abstractpub_date
2005-06-01 00:00:00pages
150-61issue
1-2eissn
0969-9961issn
1095-953Xpii
S0969-9961(04)00288-8journal_volume
19pub_type
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