Cannabidiol inhibits lung cancer cell invasion and metastasis via intercellular adhesion molecule-1

Area of Science:

• Oncology
• Pharmacology
• Cell Biology

Background:

• Cannabinoids are known to inhibit cancer cell invasion.
• This inhibition is linked to the up-regulation of tissue inhibitor of matrix metalloproteinases-1 (TIMP-1).
• The precise molecular mechanisms underlying this effect require further elucidation.

Purpose of the Study:

• To investigate the role of intercellular adhesion molecule-1 (ICAM-1) in cannabinoid-mediated inhibition of cancer cell invasion.
• To explore the signaling pathways involved in ICAM-1 induction by cannabinoids.
• To validate the anti-invasive effects of cannabinoids via ICAM-1 in preclinical models.

Main Methods:

• Utilized lung cancer cell lines (A549, H358, H460) and primary tumor cells.
• Administered various cannabinoids, including cannabidiol (CBD), Δ(9)-tetrahydrocannabinol, and R(+)-methanandamide.
• Employed techniques such as mRNA and protein analysis, receptor antagonists, siRNA, neutralizing antibodies, and xenograft models in athymic nude mice.

Main Results:

• Cannabidiol (CBD) demonstrated a concentration-dependent up-regulation of ICAM-1 expression via cannabinoid receptors, TRPV1, and MAPK signaling.
• Inhibition of ICAM-1 reversed the anti-invasive and TIMP-1-inducing effects of cannabinoids.
• CBD treatment in vivo led to increased ICAM-1 and TIMP-1 protein levels in xenografts and reduced metastasis, an effect abrogated by anti-ICAM-1 antibodies.

Conclusions:

• Cannabinoids induce ICAM-1 expression as a critical mediator of their anti-invasive properties.
• The induction of ICAM-1 subsequently leads to increased TIMP-1 levels, contributing to reduced cancer cell invasiveness.
• Targeting the ICAM-1 pathway presents a potential therapeutic strategy for enhancing cannabinoid-based cancer treatments.