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Orally active peptide vector allows using cannabis to fight pain while avoiding side effects
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The activation of cannabinoid CB1 receptors (CB1R) by Δ9-tetrahydrocannabinol (THC), the main component of Cannabis sativa, induces analgesia. CB1R activation, however, also causes cognitive impairment via the serotonin 5HT2A receptor (5HT2AR), a component of a CB1R−5HT2AR heteromer, posing a serious drawback for cannabinoid therapeutic use. We have shown that peptides reproducing CB1R transmembrane (TM) helices 5 and 6, fused to a cell-penetrating sequence (CPP), can alter the structure of the CB1R−5HT2AR heteromer and avert THC cognitive impairment while preserving analgesia. Here, we report the optimization of these prototypes into drug-like leads by (i) shortening the TM5, TM6, and CPP sequences, without losing the ability to disturb the CB1R−5HT2AR heteromer, and (ii) extensive sequence remodeling to achieve protease resistance and blood−brain barrier penetration. Our efforts have culminated in the identification of an ideal candidate for cannabis-based pain management, an orally active 16-residue peptide preserving THC-induced analgesia.
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GALLO, Maria, et al. Orally active peptide vector allows using cannabis to fight pain while avoiding side effects. Journal of Medicinal Chemistry. 2021. Vol. 64, num. 10, pags. 6937-6948. ISSN 0022-2623. [consulted: 25 of May of 2026]. Available at: https://hdl.handle.net/2445/178408