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Article: Role of Calcium Ions in Acidosis-Induced Glial Swelling
Title | Role of Calcium Ions in Acidosis-Induced Glial Swelling |
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Authors | |
Keywords | Calcium ions Cerebral ischemia Glial swelling Lactacidosis Traumatic brain injury |
Issue Date | 1997 |
Citation | Acta Neurochirurgica, Supplement, 1997, v. 1997 n. 70, p. 144-147 How to Cite? |
Abstract | Tissue acidosis occurring in cerebral ischemia and traumatic brain injury is a mediator of cytotoxic brain edema. In vitro, extracellular lactacidosis induces swelling of glial cells in a dose dependent manner. pH-regulatory membrane transporters and channels have been identified which are involved in the increase of the glial cell volume. Underlying mechanisms of their activation are poorly understood, however. We have, therefore, addressed the question, whether and how Ca2+-ions play a role in acidosis-induced glial swelling and intracellular acidification. For that purpose C6 glioma cells were suspended and the pH in the medium was lowered from 7.4 (baseline) to 6.2 by isotonic lactic acid. Cell volume and intracellular pH (pHi) were assessed by flow cytometry. In the presence of Ca2+-ions the cell volume reached a maximum of 125.1% from acidosis. In experiments using a calcium-free suspension medium, cell swelling from acidosis was inhibited by 74%. Additional buffering of intracellular calcium (Ca2+ i) had no further inhibitory effect on acidosis-induced cell swelling, while buffering of Ca2+ 1 by BAPTA-AM alone did not affect the glial volume increase secondary to administration of lactic acid. pH1 which was decreasing from acidosis was not affected by the experimental modifications of the Ca2+-concentration in the medium or cytosol. The present data indicate that lactacidosis-induced glial swelling depends on the presence of extracellular Ca2+-ions, while release of Ca2+-ions from intracellular stores does not seem to be involved. |
Persistent Identifier | http://hdl.handle.net/10722/149569 |
ISSN | 2019 SCImago Journal Rankings: 0.320 |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ringel, F | en_US |
dc.contributor.author | Plesnila, N | en_US |
dc.contributor.author | Chang, RCC | en_US |
dc.contributor.author | Peters, J | en_US |
dc.contributor.author | Staub, F | en_US |
dc.contributor.author | Baethmann, A | en_US |
dc.date.accessioned | 2012-06-26T05:55:24Z | - |
dc.date.available | 2012-06-26T05:55:24Z | - |
dc.date.issued | 1997 | en_US |
dc.identifier.citation | Acta Neurochirurgica, Supplement, 1997, v. 1997 n. 70, p. 144-147 | en_US |
dc.identifier.issn | 0065-1419 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/149569 | - |
dc.description.abstract | Tissue acidosis occurring in cerebral ischemia and traumatic brain injury is a mediator of cytotoxic brain edema. In vitro, extracellular lactacidosis induces swelling of glial cells in a dose dependent manner. pH-regulatory membrane transporters and channels have been identified which are involved in the increase of the glial cell volume. Underlying mechanisms of their activation are poorly understood, however. We have, therefore, addressed the question, whether and how Ca2+-ions play a role in acidosis-induced glial swelling and intracellular acidification. For that purpose C6 glioma cells were suspended and the pH in the medium was lowered from 7.4 (baseline) to 6.2 by isotonic lactic acid. Cell volume and intracellular pH (pHi) were assessed by flow cytometry. In the presence of Ca2+-ions the cell volume reached a maximum of 125.1% from acidosis. In experiments using a calcium-free suspension medium, cell swelling from acidosis was inhibited by 74%. Additional buffering of intracellular calcium (Ca2+ i) had no further inhibitory effect on acidosis-induced cell swelling, while buffering of Ca2+ 1 by BAPTA-AM alone did not affect the glial volume increase secondary to administration of lactic acid. pH1 which was decreasing from acidosis was not affected by the experimental modifications of the Ca2+-concentration in the medium or cytosol. The present data indicate that lactacidosis-induced glial swelling depends on the presence of extracellular Ca2+-ions, while release of Ca2+-ions from intracellular stores does not seem to be involved. | en_US |
dc.language | eng | en_US |
dc.relation.ispartof | Acta Neurochirurgica, Supplement | en_US |
dc.subject | Calcium ions | - |
dc.subject | Cerebral ischemia | - |
dc.subject | Glial swelling | - |
dc.subject | Lactacidosis | - |
dc.subject | Traumatic brain injury | - |
dc.subject.mesh | Acidosis - Physiopathology | en_US |
dc.subject.mesh | Animals | en_US |
dc.subject.mesh | Brain Edema - Physiopathology | en_US |
dc.subject.mesh | Brain Injuries - Physiopathology | en_US |
dc.subject.mesh | Brain Ischemia - Physiopathology | en_US |
dc.subject.mesh | Calcium - Physiology | en_US |
dc.subject.mesh | Flow Cytometry | en_US |
dc.subject.mesh | Neuroglia - Physiology | en_US |
dc.subject.mesh | Tumor Cells, Cultured | en_US |
dc.title | Role of Calcium Ions in Acidosis-Induced Glial Swelling | en_US |
dc.type | Article | en_US |
dc.identifier.email | Chang, RCC:rccchang@hkucc.hku.hk | en_US |
dc.identifier.authority | Chang, RCC=rp00470 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.pmid | 9416304 | en_US |
dc.identifier.scopus | eid_2-s2.0-0031309172 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-0031309172&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 1997 | en_US |
dc.identifier.issue | 70 | en_US |
dc.identifier.spage | 144 | en_US |
dc.identifier.epage | 147 | en_US |
dc.publisher.place | Austria | en_US |
dc.identifier.scopusauthorid | Ringel, F=6602136569 | en_US |
dc.identifier.scopusauthorid | Plesnila, N=7003609441 | en_US |
dc.identifier.scopusauthorid | Chang, RCC=7403713410 | en_US |
dc.identifier.scopusauthorid | Peters, J=7404191248 | en_US |
dc.identifier.scopusauthorid | Staub, F=7006611117 | en_US |
dc.identifier.scopusauthorid | Baethmann, A=7004994793 | en_US |
dc.identifier.issnl | 0065-1419 | - |