NDLI: Na+/H+ Exchangers and Intracellular pH in Perinatal Brain Injury

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Na+/H+ Exchangers and Intracellular pH in Perinatal Brain Injury

Content Provider	PubMed Central
Author	Cristina, Uria-avellanal Robertson, Nicola J.
Abstract	Encephalopathy consequent on perinatal hypoxia–ischemia occurs in 1–3 per 1,000 term births in the UK and frequently leads to serious and tragic consequences that devastate lives and families, with huge financial burdens for society. Although the recent introduction of cooling represents a significant advance, only 40 % survive with normal neurodevelopmental function. There is thus a significant unmet need for novel, safe, and effective therapies to optimize brain protection following brain injury around birth. The Na+/H+ exchanger (NHE) is a membrane protein present in many mammalian cell types. It is involved in regulating intracellular pH and cell volume. NHE1 is the most abundant isoform in the central nervous system and plays a role in cerebral damage after hypoxia–ischemia. Excessive NHE activation during hypoxia–ischemia leads to intracellular Na+ overload, which subsequently promotes Ca2+ entry via reversal of the Na+/Ca2+ exchanger. Increased cytosolic Ca2+ then triggers the neurotoxic cascade. Activation of NHE also leads to rapid normalization of pHi and an alkaline shift in pHi. This rapid recovery of brain intracellular pH has been termed pH paradox as, rather than causing cells to recover, this rapid return to normal and overshoot to alkaline values is deleterious to cell survival. Brain pHi changes are closely involved in the control of cell death after injury: an alkalosis enhances excitability while a mild acidosis has the opposite effect. We have observed a brain alkalosis in 78 babies with neonatal encephalopathy serially studied using phosphorus-31 magnetic resonance spectroscopy during the first year after birth (151 studies throughout the year including 56 studies of 50 infants during the first 2 weeks after birth). An alkaline brain pHi was associated with severely impaired outcome; the degree of brain alkalosis was related to the severity of brain injury on MRI and brain lactate concentration; and a persistence of an alkaline brain pHi was associated with cerebral atrophy on MRI. Experimental animal models of hypoxia–ischemia show that NHE inhibitors are neuroprotective. Here, we review the published data on brain pHi in neonatal encephalopathy and the experimental studies of NHE inhibition and neuroprotection following hypoxia–ischemia.
Related Links	http://dx.doi.org/10.1007/s12975-013-0322-x
Ending Page	98
Page Count	20
Starting Page	79
File Format	PDF
ISSN	18684483
e-ISSN	1868601X
Journal	Translational Stroke Research
Issue Number	1
Volume Number	5
Language	English
Publisher	Springer US
Publisher Date	2014-02-01
Access Restriction	Open
Rights Holder	Springer US
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cardiology and Cardiovascular Medicine Neuroscience Neurology (clinical)

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