The taste cell-related diffuse chemosensory system.

Area of Science:

• Physiology
• Molecular Biology
• Neuroscience

Background:

• Gustatory transduction mechanisms are known in digestive and respiratory organs.
• Taste cell-related elements, interpreted as chemoreceptors, exist as isolated cells, not in buds.
• These cells in endodermal epithelia suggest a diffuse chemosensory system (DCS) with shared signaling pathways.

Purpose of the Study:

• To explore the existence and potential role of a diffuse chemosensory system (DCS) beyond traditional taste buds.
• To investigate the molecular mechanisms and phylogenetic significance of solitary chemosensory cells.
• To assess the DCS as a potential target for novel drug discovery.

Main Methods:

• Comparative anatomical studies in lower vertebrates.
• Morphological and biochemical analyses of chemosensory cells.
• Literature review of existing data on gustatory transduction and chemoreceptors.

Main Results:

• The DCS, comprising solitary chemosensory cells and clusters, may be the phylogenetically older component of chemosensation.
• This 'submerged' portion of the DCS is likely involved in defensive or digestive functions.
• Existing data suggest a close relationship between solitary chemosensory cells and taste bud cells.

Conclusions:

• The diffuse chemosensory system (DCS) represents a significant, yet understudied, component of chemoreception.
• Solitary chemosensory cells and their signaling pathways warrant detailed investigation.
• The DCS presents a promising new avenue for therapeutic interventions targeting respiratory and digestive functions.