FMRFamide-expressing efferent neurons in eighth abdominal ganglion innervate hindgut in the silkworm, Bombyx mori.
The tetrapeptide FMRFamide is known to affect both neural function and gut contraction in a wide variety of invertebrates and vertebrates, including insect species. This study aimed to find a pattern of innervation of specific FMRFamide-labeled neurons from the abdominal ganglia to the hindgut of the silkworm Bombyx mori using the immunocytochemical method. In the 1st to the 7th abdominal ganglia, labeled efferent neurons that would innervate the hindgut could not be found. However, in the 8th abdominal ganglion, three pairs of labeled specific efferent neurons projected axons into the central neuropil to eventually innervate the hindgut. Both axons of two pairs of labeled cell bodies in the lateral rind and axons of one pair of labeled cell bodies in the posterior rind extended to the central neuropil and formed contralateral tracts of a labeled neural tract with a semi-circular shape. These labeled axons ran out to one pair of bilateral cercal nerves that extended out from the posterior end of the 8th abdominal ganglion and finally to the innervated hindgut. These results provide valuable information for detecting the novel function of FMRFamide-related peptides in metamorphic insect species.
Na
So Young
SY
School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea.
Sung
Dong Kyung
DK
Kim
Ka Kyung
KK
Kim
Kang Min
KM
Kim
Jin Hee
JH
Park
Hun Hee
HH
Lee
Sang Mong
SM
Seong
Su Il
SI
Chang
Jong-Soo
JS
Hwang
Jae Sam
JS
Kang
Seok Woo
SW
Kim
Hak Ryul
HR
Lee
Bong Hee
BH
D000818:Animals; D012831:Bombyx / Q000033:anatomy & histology* / Q000378:metabolism; D004064:Digestive System / Q000294:innervation*; D019835:FMRFamide / Q000378:metabolism*; D017952:Ganglia, Invertebrate / Q000378:metabolism*; D007150:Immunohistochemistry; D009476:Neurons, Efferent / Q000378:metabolism*
D019835:FMRFamide