Somatostatin receptor type 2 undergoes plastic changes in the human epileptic dentate gyrus.

Abstract:

:Temporal lobe epilepsy (TLE) is characterized by hippocampal sclerosis together with profound losses and phenotypic changes of different classes of interneurons, including those expressing somatostatin (SRIF). To understand the functional significance of the plasticity of SRIF transmission in TLE, unraveling the status of SRIF receptors is, however, a prerequisite. To address this issue, we characterized expression and distribution of the major SRIF receptor, the sst2 subtype, in hippocampal tissue resected in patients with TLE using complementary neuroanatomic approaches. In patients with hippocampal sclerosis, the number of cells expressing sst2 receptor mRNA as well as sst2 receptor-binding sites and immunoreactivity decreased significantly in the CA1-3, reflecting neuronal loss. By contrast, in the dentate gyrus, sst2 receptor mRNA expression was strongly increased in the granule cell layer, and sst2 receptor-binding sites and immunoreactivity was preserved in the inner but decreased significantly in the outer molecular layer. In this latter region, pronounced changes in SRIF terminal fields were observed. Decreased receptor density in the distal dendrites of granule cells is likely to reflect downregulation of sst2 receptors in response to physiopathologic release of SRIF. Because sst2 receptors have anticonvulsant and antiepileptogenic properties, this phenomenon may contribute to the etiology of TLE seizures.

authors

Csaba Z,Pirker S,Lelouvier B,Simon A,Videau C,Epelbaum J,Czech T,Baumgartner C,Sperk G,Dournaud P

doi

10.1097/01.jnen.0000186923.50215.50

subject

Has Abstract

pub_date

2005-11-01 00:00:00

pages

956-69

issue

11

eissn

0022-3069

issn

1554-6578

pii

00005072-200511000-00004

journal_volume

64

pub_type

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