Cell contact-dependent mechanisms specify taste bud pattern during a critical period early in embryonic development

Mark A. Parker, Melanie L Bell, Linda A. Barlow

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

After gastrulation, the pharyngeal endoderm is specified to give rise to taste receptor organs without further signaling from other embryonic tissues. We hypothesized that intercellular signaling might be responsible for the specification of taste buds. To test if and when this signaling was occurring, intercellular contacts were transiently disrupted in cultures of pharyngeal endoderm from axolotl embryos, and the number, size, and distribution of taste buds analyzed. Disruption of cell contacts at progressive time points, from neurula to late tail bud stages, revealed a critical period, during mid-tail bud stages, when disruption of cell contacts resulted in a significant increase in taste bud number and size. The spatial distribution of taste buds was also altered; taste buds were more clustered in explants disrupted during the critical period. These effects were not due to general alterations in mitosis and apoptosis. Rather, at least three aspects of taste bud patterning, i.e., number, size, and distribution, are governed by mechanisms dependent on normal cell contacts during a concise time window. Furthermore, our findings are consistent with specification of taste buds by means of lateral inhibitory signaling, which we hypothesize results from cell contact-dependent or short-range diffusible signals.

Original languageEnglish (US)
Pages (from-to)630-642
Number of pages13
JournalDevelopmental Dynamics
Volume230
Issue number4
DOIs
StatePublished - Aug 2004
Externally publishedYes

Fingerprint

Taste Buds
Embryonic Development
Endoderm
Tail
Ambystoma mexicanum
Gastrulation
Critical Period (Psychology)
Mitosis
Embryonic Structures
Apoptosis

Keywords

  • Amphibian
  • Axolotl
  • Epithelial patterning; three-dimensional spatial statistics
  • Lateral inhibition
  • Specification
  • Tissue culture

ASJC Scopus subject areas

  • Developmental Biology
  • Cell Biology

Cite this

Cell contact-dependent mechanisms specify taste bud pattern during a critical period early in embryonic development. / Parker, Mark A.; Bell, Melanie L; Barlow, Linda A.

In: Developmental Dynamics, Vol. 230, No. 4, 08.2004, p. 630-642.

Research output: Contribution to journalArticle

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