1,3-Diphenylpropan-1-Ones as Allosteric Modulators of α7 Nach Receptors with Analgesic and Antioxidant Properties

Abstract

Nicotine acethylcholine receptors (nAChRs) play critical roles in cognitive processes, neuroprotection and inflammation. Results: According to their substituents, 1,3-diphenylpropan-1-one derivatives act as α7 nAChRs negative allosteric modulators (NAM, OMe) or Type I positive allosteric modulators (PAMs, OH). Compounds 7 and 31 were the most effective (989 and 666% enhancement of ACh-induced currents) and potent (EC₅₀: 12.9 and 6.85 μM) PAMs. They exhibited strong radical scavenging values. Compound 31, selective over other neuronal nAChR subtypes and with acceptable pharmacokinetic profile, showed antinociceptive effects in a model of inflammatory pain. Conclusion: Compound 31 is a novel, potent and selective α7 nAChR PAM, displaying antioxidant and analgesic activities. The 1,3-diphenylpropan-1-one scaffold could be the base toward more advanced type I PAMs for the treatment of nAChR-mediated diseases.

Keywords::

• α7 nAChR
• antioxidant
• inflammation
• pain
• positive allosteric modulator

Acknowledgements

The authors would like to thank Susana Cámara Garrido for her assistance in the synthesis of some starting compounds and Susana Gerber for technical assistance.

Financial & competing interests disclosure

This work was supported by the Spanish MINECO: CSD2008–00005, The Spanish Ion Channel Initiative-CONSOLIDER INGENIO 2010, SAF2011-22802 and BFU2012-39092-C02. The Instituto de Neurociencias is a “Centre of Excellence Severo Ochoa”. BBP thanks the CSIC for a predoctoral fellowship (JAE-Predoc from Junta para la Ampliación de Estudios, co-financed by FSE). The authors have no other relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript apart from those disclosed.

No writing assistance was utilized in the production of this manuscript.

Ethical conduct of research

The authors state that they have obtained appropriate institutional review board approval or have followed the principles outlined in the Declaration of Helsinki for all human or animal experimental investigations. In addition, for investigations involving human subjects, informed consent has been obtained from the participants involved.

Additional information

Funding

This work was supported by the Spanish MINECO: CSD2008–00005, The Spanish Ion Channel Initiative-CONSOLIDER INGENIO 2010, SAF2011-22802 and BFU2012-39092-C02. The Instituto de Neurociencias is a “Centre of Excellence Severo Ochoa”. BBP thanks the CSIC for a predoctoral fellowship (JAE-Predoc from Junta para la Ampliación de Estudios, co-financed by FSE). The authors have no other relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript apart from those disclosed.