Glutamate-like immunoreactivity in the cestode Hymenolepis diminuta

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Abstract
Glutamate-like immunoreactivity in the cestode Hymenolepis diminuta was investigated at the light-microscopic level by immunohistochemistry with an antiglutamate antibody. Immunoreactivity was seen in the basal region of the suckers, in the rostellum, subtegumental regions, central nervous system, and longitudinal nerve cords, and in eggs. In the scolex the cerebral ganglia were diffusely immunoreactive, and immunoreactive tracts, passing from the cerebral ganglia to the suckers, were observed. The longitudinal nerve cords contained large groups of intensely stained cell bodies and processes throughout the length of the strobila. Immunoreactive tracts from the longitudinal nerve cords formed junctions with the deep longitudinal muscles only in the lateral regions of the proglottids. However, neuron-like varicose swellings were seen in the subtegumental area of the mature region. The localization of glutamate-like immunoreactivity in various parts of the nervous system and tissues of Hymenolepis diminuta provides further support for the role of glutamate as an excitatory neuromuscular transmitter in the platyhelminths.

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