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ISSN: 2157-7013

Journal of Cell Science & Therapy
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Editorial

The Ammonia Hypothesis of Hepatic Encephalopathy should be Revisited

Matthew McMillin2 and Sharon DeMorrow1*

1Department of Internal Medicine, Texas A&M Health Science Center College of Medicine, Temple Texas, USA

2Digestive Disease Research Center, Scott & White Hospital, Central Texas Veterans Health Care System, Temple Texas, USA

*Corresponding Author:
Sharon DeMorrow, Ph.D
Assistant Professor, Department of Internal Medicine
Scott & White Digestive Disease Research Center
Texas A&M Health Science Center, 1901 South 1st street
Building 205, Temple TX, 76504, USA
Tel: 254 743 1299
Fax: 254 743 0378
E-mail:[email protected]

Received date: July 31, 2012; Accepted date: August 02, 2012; Published date: August 04, 2012

Citation: McMillin M, DeMorrow S (2012) The Ammonia Hypothesis of Hepatic Encephalopathy should be Revisited. J Cell Sci Ther 3:e110. doi: 10.4172/2157-7013.1000e110

Copyright: © 2012 DeMorrow S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Hepatic Encephalopathy (HE) is a neurological complication of the brain following liver damage that was classically thought of being a functional decline in neuronal activity due to metabolic disturbances. Acute liver failure as well as chronic liver diseases can cause HE, with the progression of HE correlating to the severity of liver damage. Initially there are disturbances in cognition, that then progress to disruptions in motor control, and finally global suppression of neural circuits, which can lead to coma. The first factor identified as a causal link and a treatment point for HE was ammonia. However, recent research has begun to elucidate strong support for other pathological processes in this disorder as well. Due to these varying ideas on the progression of HE, this editorial will discuss why the ammonia hypothesis of HE pathogenesis is supported by current research as well as some strong counterpoints that refute this hypothesis.

Ammonia does play a part in HE pathogenesis, the studies conducted clinically and using animal models have demonstrated that other elements must be involved with HE progression to explain pathogenesis not accounted for by ammonia toxicity. As it stands, ammonia seems to play a significant role in chronic liver disease states while playing a small role during acute liver failure and minimal hepatic encephalopathy. Future studies will need to find ways to isolate these pathological processes in various acute and chronic liver damage models to fully identify the pathological effects of ammonia. In conclusion, ammonia does play a role in HE progression but due to its lack of involvement in some aspects of HE progression, there is the need to investigate its interplay with other pathological processes to help develop better therapeutic treatments options for HE.

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