Abstract
Immunocytochemical techniques were used to detect FMRFamide-like immunoreactivity in adults of the filarial nematodes Dirofilaria immitis and Brugia pahangi. An FMRFamide-like peptide was also located in third- and fourth-stage larvae of D. immitis. Positive immunoreactivity was observed in all parasites examined, irrespective of developmental stage. The major areas of positive immunoreactivity were located in the anterior nerve ring, lateral/dorso-ventral nerves, cephalic papillary ganglia and lateral ganglia. No staining was seen in the intestine or gonads of any parasite. These results indicate that filarial worms possess a peptidergic component in their nervous system. The possible role of an FMRFamide-like peptide in the control of certain physiological events is discussed.
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