Brain, Vol. 124, No. 4, 688-697,
April 2001
© 2001 Oxford University Press
Somatostatin- and neuropeptide Y-synthesizing neurones in the fascia dentata of humans with temporal lobe epilepsy
1 Centre for Neurosciences, Southampton University, Southampton General Hospital, UK and 2 Laboratoire d'Epileptologie Expérimentale et Clinique, Université Victor Ségalen, Bordeaux, France
Correspondence to:
Dr L. E. Sundstrom, Centre for Neurosciences, Mail Point 806, Southampton University, Level F, South Academic Block, Southampton General Hospital, Tremona Road, Southampton S016 6YD, UK E-mail: les{at}soton.ac.uk
We used in situ hybridization techniques to study the distribution of neurones synthesizing somatostatin mRNA and neuropeptide Y mRNA in the hilar region of the hippocampal formation of patients with temporal lobe epilepsy. In the dentate gyrus, somatostatin mRNA- and neuropeptide Y mRNA-synthesizing neurones were found to be exclusively located within the hilar region. Unlike animal models, no ectopic expression of either peptide was found in principal cells. The numbers of hilar interneurones expressing somatostatin mRNA and neuropeptide Y mRNA were compared with the degree of hilar cell loss determined by immunohistochemistry against neuronal nuclear antigen. The numbers of somatostatin and neuropeptide Y mRNA-synthesizing neurones varied considerably between patients, but both were found to be highly correlated to the total number of neuronal nuclear antigen-immunoreactive hilar neurones. These results suggest that loss of somatostatin and neuropeptide Y interneurones occurs in proportion to overall hilar cell loss, and therefore the hypothesis of a selective loss of these interneurones in temporal lobe epilepsy seems unlikely.
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