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A single N-terminal cysteine in TRPV1 determines activation by pungent compounds from onion and garlic

Héctor Salazar1, Itzel Llorente, Andrés Jara-Oseguera

  • 1Departamento de Biofísica, Instituto de Fisiología Celular, Circuito Exterior S/N, Ciudad Universitaria, Universidad Nacional Autónoma de México, México, D.F., 04510, Mexico.

Nature Neuroscience
|February 26, 2008
PubMed

Insights

Transient receptor potential vanilloid 1 (TRPV1) channels are activated by pungent compounds like allicin from garlic and onions. This activation, involving cysteine modification, contributes to pain perception alongside TRPA1 channels.

Area of Science:

  • Molecular biology
  • Neuroscience
  • Sensory science

Background:

  • Transient receptor potential (TRP) channels are crucial for sensory perception.
  • TRPA1 channels are known activators of pungent compounds, but TRPV1 activation is debated.

Purpose of the Study:

  • To investigate the activation of TRPV1 channels by pungent compounds found in garlic and onion.
  • To elucidate the molecular mechanism of TRPV1 activation by these compounds and its role in pain.

Main Methods:

  • Utilized pungent extracts from onion and garlic, and the compound allicin.
  • Investigated channel activation through covalent modification of cysteine residues.
  • Examined pain-related behaviors in the context of TRP channel activity.

Main Results:

  • Established that TRPV1 channels are activated by onion and garlic extracts and allicin.
  • Demonstrated that allicin activates TRPV1 through covalent modification of a single N-terminal cysteine residue.
  • Showed that TRPV1, along with TRPA1, participates in pain behaviors induced by allicin.

Conclusions:

  • TRPV1 activation by pungent compounds occurs via covalent cysteine modification, similar to TRPA1.
  • A single cysteine modification in TRPV1 is sufficient for activation by these agents.
  • Findings reveal a conserved activation mechanism in TRP channels, advancing understanding of noxious stimuli detection.

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