| 1. |
- Davis, N T, et al.
(författare)
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Crustacean cardioactive peptide-immunoreactive neurons in the hawkmoth Manduca sexta and changes in their immunoreactivity during postembryonic development.
- 1993
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Ingår i: Journal of Comparative Neurology. - : Wiley. - 0021-9967 .- 1096-9861. ; 338:4, s. 612-27
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Tidskriftsartikel (refereegranskat)abstract
- An antiserum against crustacean cardioactive peptide was used, in indirect immunocytochemistry on whole-mounts and Vibratome sections, to map immunoreactive neurons at various stages of postembryonic development of the hawkmoth Manduca sexta. About 90 immunoreactive neurons were identified. Many of these cells are immunoreactive at hatching and persist into the adult stage; others become immunoreactive late in postembryonic development. During adult development, transient immunoreactivity is expressed in several cells in the subesophageal and thoracic ganglia. Two sets of immunoreactive neurons are found in the protocerebrum of larvae, but only one of these sets persists into the adult stage. Paired lateral interneurons and neurosecretory neurons are segmentally repeated in the abdominal ganglia and are present from the first larval stage to the adult; the abdominal interneurons project contralaterally to arborizations in adjacent ganglia, and some ascend to tritocerebral arborizations. The abdominal neurosecretory cells, which correspond to a pair of cells reported to contain bursicon, project posteriorly to neurohemal release organs. Motor neurons of dorsal external oblique abdominal muscles become immunoreactive in the fourth larval stage. Paired median neurosecretory cells of abdominal ganglia become immunoreactive during the fifth larval stage. The immunoreactive median and lateral abdominal neurosecretory cells are a subset of a group of cells known to contain cardioactive peptides. Paired lateral neurosecretory cells of the subesophageal ganglion become immunoreactive during pupation and project to the corpora cardiaca and aorta of the adult. Many of the neurons identified here are comparable to crustacean cardioactive peptide-immunoreactive cells described previously in locusts and the mealworm beetle.
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| 2. |
- Löhr, J, et al.
(författare)
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Quantification, immunoaffinity purification and sequence analysis of a pigment-dispersing hormone of the shore crab, Carcinus maenas (L.).
- 1993
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Ingår i: Comparative biochemistry and physiology. B, Comparative biochemistry. - 0305-0491. ; 104:4, s. 699-706
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Tidskriftsartikel (refereegranskat)abstract
- 1. A sensitive sandwich-ELISA for pigment-dispersing hormone (PDH) with a detection limit of approximately 5 fmol per well has been developed using primary IgG and secondary biotinylated IgG fractions from an antiserum against beta-PDH and streptavidin-peroxidase conjugate for detection. 2. ELISA determinations in different parts of the central nervous system of the shore crab Carcinus maenas revealed maximum levels of 15.1 pmol immunoreactive PDH in the two eyestalk ganglia of one crab, 3.6 pmol in the sinus glands, 2.8 pmol in the brain and 0.8 pmol in the thoracic ganglia. 3. Carcinus PDH was purified from whole eyestalk ganglia and sinus glands by use of a simple two-step purification procedure consisting of immunoaffinity-prepurification on an anti-PDH IgG-protein A-Sepharose column and HPLC. 4. Automated gas-phase sequencing of the purified peptide and FAB-mass spectroscopy unambiguously revealed the sequence of Carcinus PDH as NSELINSILGLPKVMNDAamide (M(r) 1927.2 Da), which is identical to the beta-PDH of other brachyuran crustaceans.
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| 3. |
- Webster, S. G., et al.
(författare)
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Putative molt-inhibiting hormone in larvae of the shore crab Carcinus-maenas L. - an immunocytochemical approach
- 1991
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Ingår i: The Biological Bulletin. - Chicago : University of Chicago Press. - 0006-3185 .- 1939-8697. ; 180, s. 65-71
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Tidskriftsartikel (refereegranskat)abstract
- Immunocytochemical investigations of the eyestalk of Carcinus maenas zoeal larval stages, using an antiserum directed against putative Carcinus molt-inhibiting hormone (MIH), revealed immunopositive neuronal structures. These structures included perikarya associated with the medulla terminalis X-organ, parts of the sinus gland tract, and the neurohemal organ-the sinus gland. Apart from an increase in volume of the sinus gland between zoeal stage I and II, no striking changes in the topography or morphology of the MIH neurosecretory system were observed. Immunopositive structures were found in similar locations to those seen in adult crabs. Our results suggest that the control of molting by MIH in crustacean larvae may be similar to the currently accepted model of molt control in adult decapod crustaceans.
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