Estudios inmunohistoquímicos sobre la distribución de colecistoquinina en el sistema nervioso central de Triatoma infestans.

SETTEMBRINI BEATRIZ P; GALVANI GERÓNIMO L; DE PASQUALE DANIELA; VILLAR MARCELO J

Paraná, Entre Ríos

Congreso; Encuentro Nacional de Ciencias Naturales del Litoral.; 2006

Asociación de Ciencias Naturales del Litoral. Universidad Autónoma de Entre Ríos. CICYTTP-CONICET

The distribution of cholecystokinim-like immunoreactivity was studied in the central nervous system of the heteropteran insect Triatoma infestans using high-sensitivity immunocytochemistry. In the protocerebrum CCK-IR somata were observed in the anteromedial, anterolateral and in the posterior slope. The neuropils displayed different densities of immunoreactive neurites. Few immunoreactive somata were found in the optic lobe in both the medial an lateral soma cortex as well as in the proximal optic lobe. Immunoreactive fibers were present in the medulla and lobula complex. The sensory deutocerebrum contained a higher number of immunopositive cells than the antennal mechanosensory and motor center. The antennal lobe glomeruli displayed a moderate density of immunoreactive fibers. With regard to the subesophageal ganglion, numerous CCK-IR somata were found close to the root of the mandibular nerve, others were present in the soma rind of the remaining neuromeres. CCK-IR perikarya were present in both thoracic ganglia, with the abdominal neuromeres containing the highest number of positive somata. The neuropils of both ganglia showed moderate densities of immunopositive processes. The distribution of CCK-LI in the somata and neuropils of central nervous system of T. infestans is widespread suggesting that a CCK-like peptide may act mainly as a neurotrasmitter in integrative functions