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Expression of the genes for alpha-type and beta-type calcitonin gene-related peptide during rat embryogenesis.

Abstract：

:Throughout rat embryogenesis we analysed the expression patterns of the three mature transcripts generated from the two calcitonin gene-related peptide genes: calcitonin, alpha-calcitonin gene-related peptide, and beta-calcitonin gene-related peptide messenger RNAs. In addition, we examined in parallel the distribution of calcitonin gene-related peptide and calcitonin immunoreactivity. Of the three transcripts, beta-calcitonin gene-related peptide messenger RNA was first detected in sensory ganglia on embryonic day 14, and by embryonic day 15 was seen to a lesser degree in motor neurons and autonomic ganglia. Starting at embryonic day 16, however, the highest levels of beta-calcitonin gene-related peptide messenger RNA were found in motor neurons rather than sensory ganglia. Alpha-calcitonin gene-related peptide messenger RNA was first detected on embryonic day 16 in both sensory ganglia and motor neurons, but at lower levels than beta-calcitonin gene-related peptide, particularly in the motor neurons of the spinal cord. By embryonic day 20, transcripts for alpha- and beta-calcitonin gene-related peptide were expressed in distinct brain regions. High levels of alpha-calcitonin gene-related peptide messenger RNA were detected in hypoglossal, facial, and parabrachial nuclei, and moderate levels in the trigeminal motor and ambiguus nuclei. By contrast, beta-calcitonin gene-related peptide messenger RNA was detected at low levels in hypoglossal, ambiguus, facial, and parabrachial nuclei, and at high levels in the trigeminal nucleus. In the oculomotor-trochlear nucleus, beta-calcitonin gene-related peptide messenger RNA was the sole isotype expressed. Low levels of messenger RNA for both calcitonin gene-related peptide transcripts were appreciated in the inferior olive. Outside the nervous system, alpha-calcitonin gene-related peptide messenger RNA was weakly expressed in the thyroid gland and beta-calcitonin gene-related peptide messenger RNA in the thymus. Throughout embryogenesis, calcitonin gene-related peptide immunoreactivity usually followed the expression of either alpha- or beta-calcitonin gene-related peptide messenger RNA. Calcitonin messenger RNA and protein were detected only in the thyroid gland from embryonic day 18 onward. This work shows that of the three mature transcripts produced by the two calcitonin gene-related peptide genes, beta-calcitonin gene-related peptide messenger RNA is the predominant transcript produced early in rat embryogenesis. However, by perinatal stages alpha-calcitonin gene-related peptide shows the highest expression in the brain and spinal cord. In autonomic ganglia, beta-calcitonin gene-related peptide is either the sole or the predominant transcript. Unlike the chick embryo in which calcitonin messenger RNA is expressed early in the CNS, in rat it was only expressed outside the nervous system in the thyroid gland during the last days of embryogenesis.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Terrado J,Gerrikagoitia I,Domínguez L,Raldúa D,Martínez-Millán L,Sarasa M

doi

10.1016/s0306-4522(98)00730-1

keywords:

subject

Has Abstract

pub_date

1999-01-01 00:00:00

pages

713-27

issue

2

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(98)00730-1

journal_volume

92

pub_type

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