Summary
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1.
A 28-kDa peptide from the brain of the tobacco hornworm,Manduca sexta, was purifiedvia HPLC. The peptide copurified with the insect neurohormone, prothoracicotropic hormone (PTTH), through two HPLC columns.
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2.
Immunocyctochemistry using polyclonal antibodies against the 28-kDa peptide revealed that the peptide was produced in the same protocerebral neurons that produce PTTH. Western blot analysis demonstrated that the 28-kDa peptide and big PTTH are different molecules.
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3.
A PTTHin vitro bioassay indicated that despite having chromatographic properties similar to those of big PTTH and being produced by the same neurons, the 28-kDa peptide did not have PTTH activity.
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4.
Amino acid sequence analysis yielded a 27 N-terminal amino acid sequence that had no similarity with known peptides.
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5.
Immunocytochemical studies revealed that the 28-kDa peptide is present as early as 30% embryonic development and is absent by adult eclosion. This is in contrast to big PTTH, which is expressed throughout theManduca life cycle.
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6.
These data suggest that the 28-kDa peptide is another secretory phenotype of the lateral neurosecretory cell group III (L-NSC III) which may have functions distinct from those for big PTTH or may act synergistically with big PTTH.
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Gray, R.S., Muehleisen, D.P., Katahira, E.J. et al. A 28-kDa cerebral neuropeptide fromManduca sexta: Relationship to the insect prothoracicotropic hormone. Cell Mol Neurobiol 13, 39–58 (1993). https://doi.org/10.1007/BF00712988
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DOI: https://doi.org/10.1007/BF00712988