Related Experiment Videos
N6,C8-distributed adenosine derivatives as partial agonists for adenosine A1 receptors
H Roelen1, N Veldman, A L Spek
1Leiden/Amsterdam Center for Drug Research, Divisions of Medicinal Chemistry and Pharmacology, Leiden, The Netherlands.
Journal of Medicinal Chemistry
|March 29, 1996
Summary
Researchers synthesized novel adenosine derivatives, N6-cyclopentyladenosine and C8-(cyclopentylamino)adenosine analogs, to explore their potential as partial agonists for adenosine receptors. These compounds demonstrated A1 selectivity and partial agonism in vivo, suggesting therapeutic potential.
Area of Science:
- Medicinal Chemistry
- Pharmacology
- Structural Biology
Background:
- Adenosine receptors (ARs) are crucial drug targets for various physiological processes.
- Developing selective AR modulators, particularly partial agonists, is essential for fine-tuning therapeutic responses.
- Understanding structure-activity relationships of adenosine derivatives is key to designing effective drugs.
Purpose of the Study:
- To synthesize and biologically evaluate novel N6, C8-disubstituted adenosine derivatives.
- To investigate the potential of these compounds as partial agonists for adenosine receptors.
- To determine the selectivity and affinity of synthesized compounds for A1 and A2a AR subtypes.
Main Methods:
- Synthesis of two series of N6-cyclopentyladenosine and C8-(cyclopentylamino)adenosine derivatives via three synthetic routes.
- X-ray crystal structure determination of N6-ethyl-8(cyclopentylamino)adenosine (9b) to elucidate its conformation.
- In vitro radioligand binding assays to assess receptor affinities and GTP shift experiments to evaluate functional activity.
Main Results:
- Successfully synthesized and characterized N6-cyclopentyladenosine derivatives (3a-e) and C8-(cyclopentylamino)adenosine analogs (3e, 9a-d).
- X-ray crystallography revealed an anti conformation of the ribose moiety in compound 9b due to intramolecular hydrogen bonding.
- All synthesized compounds exhibited A1 receptor selectivity with high nanomolar to low micromolar affinities. GTP shift values indicated partial agonism, with lower intrinsic activities compared to the full agonist N6-cyclopentyladenosine in vivo.
Conclusions:
- The synthesized N6, C8-disubstituted adenosine derivatives are selective for A1 adenosine receptors.
- The observed GTP shift values suggest these compounds function as partial agonists.
- These findings highlight the potential of these novel adenosine analogs for therapeutic applications targeting adenosine receptors.