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| pubmed-article:11587552 | pubmed:issue | 4 | lld:pubmed |
| pubmed-article:11587552 | pubmed:dateCreated | 2001-10-5 | lld:pubmed |
| pubmed-article:11587552 | pubmed:abstractText | Calcium and calcium-dependent processes have been hypothesized to be involved in the induction of epilepsy. It has been shown that epileptic neurons have altered calcium homeostatic mechanisms following epileptogenesis in the hippocampal neuronal culture (HNC) and pilocarpine models of epilepsy. To investigate the mechanisms causing these alterations in [Ca2+]i homeostatic processes following epileptogenesis, we utilized the HNC model of in vitro 'epilepsy' which produces spontaneous recurrent epileptiform discharges (SREDs). Using [Ca2+]i imaging, studies were initiated to evaluate the mechanisms mediating these changes in [Ca2+]i homeostasis. 'Epileptic' neurons required much longer to restore a glutamate induced [Ca2+]i load to baseline levels than control neurons. Inhibition of Ca2+ entry through voltage and receptor gated Ca2+ channels and stretch activated Ca2+ channels had no effect on the prolonged glutamate induced increase in [Ca2+]i in epileptic neurons. Employing thapsigargin, an inhibitor of the sarco/endoplasmic reticulum calcium ATPase (SERCA), it was shown that thapsigargin inhibited sequestration of [Ca2+]i by SERCA was significantly decreased in 'epileptic' neurons. Using Ca2+ induced Ca2+ release (CICR) cell permeable inhibitors for the ryanodine receptor (dantrolene) and the IP3 receptor (2-amino-ethoxydiphenylborate, 2APB) mediated CICR, we demonstrated that CICR was significantly augmented in the 'epileptic' neurons, and determined that the IP3 receptor mediated CICR was the major release mechanism altered in epileptogenesis. These data indicate that both inhibition of SERCA and augmentation of CICR activity contribute to the alterations accounting for the impaired calcium homeostatic processes observed in 'epileptic' neurons. The results suggest that persistent changes in [Ca2+]i levels following epileptogenesis may contribute to the long-term plasticity changes manifested in epilepsy and that understanding the basic mechanisms mediating these changes may provide an insight into the development of novel therapeutic approaches to treat epilepsy and prevent or reverse epileptogenesis. | lld:pubmed |
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| pubmed-article:11587552 | pubmed:language | eng | lld:pubmed |
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| pubmed-article:11587552 | pubmed:citationSubset | IM | lld:pubmed |
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| pubmed-article:11587552 | pubmed:status | MEDLINE | lld:pubmed |
| pubmed-article:11587552 | pubmed:month | Oct | lld:pubmed |
| pubmed-article:11587552 | pubmed:issn | 0143-4160 | lld:pubmed |
| pubmed-article:11587552 | pubmed:author | pubmed-author:DeLorenzoR... | lld:pubmed |
| pubmed-article:11587552 | pubmed:author | pubmed-author:PalSS | lld:pubmed |
| pubmed-article:11587552 | pubmed:author | pubmed-author:SunDD | lld:pubmed |
| pubmed-article:11587552 | pubmed:author | pubmed-author:RafiqAA | lld:pubmed |
| pubmed-article:11587552 | pubmed:author | pubmed-author:LimbrickDD | lld:pubmed |
| pubmed-article:11587552 | pubmed:copyrightInfo | Copyright 2001 Harcourt Publishers Ltd. | lld:pubmed |
| pubmed-article:11587552 | pubmed:issnType | Print | lld:pubmed |
| pubmed-article:11587552 | pubmed:volume | 30 | lld:pubmed |
| pubmed-article:11587552 | pubmed:owner | NLM | lld:pubmed |
| pubmed-article:11587552 | pubmed:authorsComplete | Y | lld:pubmed |
| pubmed-article:11587552 | pubmed:pagination | 285-96 | lld:pubmed |
| pubmed-article:11587552 | pubmed:dateRevised | 2010-11-18 | lld:pubmed |
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| pubmed-article:11587552 | pubmed:year | 2001 | lld:pubmed |
| pubmed-article:11587552 | pubmed:articleTitle | Epileptogenesis induces long-term alterations in intracellular calcium release and sequestration mechanisms in the hippocampal neuronal culture model of epilepsy. | lld:pubmed |
| pubmed-article:11587552 | pubmed:affiliation | Department of Neurology, Medical College of Virginia, Virginia Commonwealth University, Richmond 23298-0599, USA. | lld:pubmed |
| pubmed-article:11587552 | pubmed:publicationType | Journal Article | lld:pubmed |
| pubmed-article:11587552 | pubmed:publicationType | Research Support, U.S. Gov't, P.H.S. | lld:pubmed |
| pubmed-article:11587552 | pubmed:publicationType | Research Support, Non-U.S. Gov't | lld:pubmed |
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