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alpha-Melanocyte stimulating hormone (alpha-MSH) has a relatively low affinity for the melanocortin MC4 receptor. Constructs of multimeric alpha-MSH varying from one to eight subunits were synthesized to test whether they displayed an improved ability to bind to and activate the human melanocortin MC4 receptor. alpha-MSH subunits were coupled by a flexible linker and placed in front of an IRES-eGFP sequence. Efficacy for activation of the melanocortin MC4 receptor increased with every extra subunit, resulting in a 100 fold lower EC50 value of alpha-MSH8 when compared with alpha-MSH1. Furthermore, supernatant of cells transfected with alpha-MSH8 proved to have an increased affinity to the melanocortin MC4 receptor when compared to cells transfected with the other multimers. Together, these data show that multimeric alpha-MSH has improved ability to activate the human melanocortin MC4 receptor in vitro.

Original publication

DOI

10.1016/j.ejphar.2008.02.046

Type

Journal article

Journal

Eur J Pharmacol

Publication Date

06/05/2008

Volume

585

Pages

24 - 30

Keywords

Amino Acid Sequence, Base Sequence, Cell Line, Cloning, Molecular, Humans, Ligands, Molecular Sequence Data, Receptor, Melanocortin, Type 4, Transfection, alpha-MSH