Distribution of serotonin in the central nervous system of the blood‐feeding heteropteran, Triatoma infestans (Heteroptera: Reduviidae)

Abstract

The distribution of serotonin was studied in the Triatoma infestans central nervous system by using immunocytochemistry. Serotonin immunoreactive cell bodies and fibers were observed in the brain, subesophageal ganglion, and thoracic ganglia. In the brain, serotonin-like immunoreactivity was detected in a limited number of somata, which gave rise to an extensive network of labeled neurites in patterned as well as in nonglomerular neuropils. Immunolabeled perikarya were observed in the optic lobe and in the anteromedial and caudolateral soma rinds of the protocerebrum. Deutocerebral immunoreactive somata were mainly found in the medial layer surrounding the antennal lobe glomeruli, as well as in relationship to the antennal mechanosensory and motor center. The subesophageal ganglion contained serotonin immunoreactive perikarya of variable sizes and moderate to low density of positive fibers. In the prothoracic ganglion, immunoreactive somata were detected near the cephalic connectives as well as in its caudal end. Serotonin immunoreactive somata and fibers were observed in the posterior ganglion of the thorax, with the abdominal neuromeres harboring the highest number of immunolabeled perikarya. These results show that there is a widespread unique serotonergic system in the CNS of Triatoma infestans and suggest that the indolamine could act as a neuromodulator or as a neurohormone.

Lymphatic and vascular embolizations are independent predictive variables of inguinal lymph node involvement in patients with squamous cell carcinoma of the penis

“…2A). Although the 5HT‐ir of the AL of one hemipteran ( Triatoma infestans : Reduviidae) has been examined (Settembrini and Villar, 2004), the source of this innervation was not characterized. We examined two species of hemipterans.…”

Immunohistochemical mapping of histamine, dopamine, and serotonin in the central nervous system of the copepod Calanus finmarchicus (Crustacea; Maxillopoda; Copepoda)

“…The distribution of serotonin has been extensively mapped in a number of arthropods (e.g., Myhrberg et al 1979;Beltz and Kravitz 1983;Bishop and O'Shea 1983;Elofsson 1983Elofsson , 1992Cournil et al 1984;Klemm et al 1984;Nässel and Elekes 1984;Schürmann and Klemm 1984;Nässel and Elekes 1985;Longley and Longley 1986;Siwicki et al 1987;Sandeman et al 1988;Dubbels and Elofsson 1989;Homberg and Hildebrand 1989;Katz et al 1989;Beltz et al 1990;Real and Czternasty 1990;Salecker and Distler 1990;Lundell and Hirsh 1994;Thompson et al 1994;Christie et al 1995;Harzsch and Dawirs 1995;Schürmann et al 1995;Würden and Homberg 1995;Bicker 1999;Callaway and Stuart 1999;Hörner 1999;Leitinger et al 1999;Tierney et al 1999;Wegerhoff 1999;Ignell 2001;Homberg 2002;Moreau et al 2002;Harzsch 2004;Settembrini and Villar 2004;Fu et al 2005;Gallus et al 2005;Barthelemy et al 2006;…”

Phylogeny of a serotonin‐immunoreactive neuron in the primary olfactory center of the insect brain

“…2A). Although the 5HT-ir of the AL of one hemipteran (Triatoma infestans: Reduviidae) has been examined (Settembrini and Villar, 2004), the source of this innervation was not characterized. We examined two species of hemipterans.…”