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Plasticity in the nervous system of adult hydra. I. The position-dependent expression of FMRFamide-like immunoreactivity.

Abstract：

:The plasticity of nerve cells expressing the neuropeptide FMRFamide was examined in adult hydra. Using a whole-mount technique with indirect immunofluorescence, the spatial pattern of neurons showing FMRFamide-like immunoreactivity (FLI) was visualized. These neurons were located in the tentacles, hypostome, and peduncle, but not in the body column or basal disc. Since every neuron in the nerve net is continuously displaced toward an extremity and eventually sloughed, the constant pattern of FLI+ neurons could arise in one of two ways. When displaced into the appropriate region, FLI- neurons are converted to FLI+ neurons, or FLI+ neurons arise by differentiation from interstitial cells. To distinguish between these two possibilities, interstitial cells, the multipotent precursors of the nerve cells, were eliminated by treatment with hydroxyurea or nitrogen mustard. Following head, or foot and peduncle, removal from these animals, the missing structures regenerated. The spatial pattern of FLI+ neurons reappeared in the newly regenerated head or peduncle. This shows FLI- neurons in the body column were converted to FLI+ when their position was changed to the head or the peduncle. When the peduncle was grafted into the body column, it was converted to basal disc or body column tissue, and FLI disappeared. The appearance and loss of FLI was always position dependent. These results indicate that the neurons in the mature nerve net can change their neuropeptide phenotype in response to changes in their position.

journal_name

Dev Biol

journal_title

Developmental biology

authors

Koizumi O,Bode HR

doi

10.1016/0012-1606(86)90142-9

subject

Has Abstract

pub_date

1986-08-01 00:00:00

pages

407-21

issue

2

eissn

0012-1606

issn

1095-564X

pii

0012-1606(86)90142-9

journal_volume

116

pub_type

杂志文章

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