TRPV3 is a temperature-sensitive vanilloid receptor-like protein.

Area of Science:

• Neuroscience
• Molecular Biology
• Sensory Physiology

Background:

• Vanilloid Receptor-1 (VR1/TRPV1) is a thermosensitive cation channel activated by heat, acid, and capsaicin.
• VR1 gene disruption affects capsaicin response but minimally impacts thermal nociception, suggesting other heat sensors exist.

Purpose of the Study:

• To identify novel thermosensitive receptors distinct from VR1.
• To characterize the function and properties of a newly identified vanilloid receptor family member.

Main Methods:

• Gene identification and characterization of VRL3 (TRPV3).
• Analysis of VRL3 expression in dorsal root ganglion neurons.
• Functional studies of VRL3, including heterologous expression and association with VR1.

Main Results:

• Identified Vanilloid Receptor-Like Protein 3 (VRL3/TRPV3), a heat-sensitive but capsaicin-insensitive ion channel.
• VRL3 has a heat activation threshold of approximately 39°C and is co-expressed with VR1 in sensory neurons.
• VRL3 can associate with VR1, potentially modulating its function.

Conclusions:

• VRL3 is a novel thermosensitive ion channel involved in heat sensation.
• VRL3 may function as an additional subunit in heteromeric vanilloid receptor channels, alongside VR1.
• Discovery of VRL3 expands understanding of thermosensation mechanisms beyond VR1.