Perspective on the role of the N-terminal tail of the α2C-adrenoceptor

Uhlén, Staffan; Jahnsen, Jan Anker

doi:10.1007/s00210-014-1029-6

Cited by 1 publication

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“…Even though the FLAG epitope is only eight amino acids long and is incorporated in in a letter to editor [77]. We answered this comment from Angelotti and Hurt in a rebuttal letter to the editor [78]. The crux of the disagreement seems to stem from the different data on expression of binding competent 2C -adrenoceptors as determined by radioligand binding, since we have not studied trafficking of receptors or intracellular location.…”

Section: Incorporating Epitopes In the N-terminus Influence Receptor mentioning

confidence: 94%

The C-terminal half of the α2C-adrenoceptor determines the receptor's membrane expression level and drug selectivity

Jahnsen

Uhlén

2013

Naunyn-Schmiedeberg's Arch Pharmacol

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In tissues as well as in transfected cells, α2C-adrenoceptors show poorer expression levels compared to α2A-adrenoceptors. In order to characterize which regions of the α2C-adrenoceptor are involved in regulating the expression of binding-competent receptors at the plasma membrane, six chimeric α2A-/α2C-adrenoceptors were constructed. The wild-type α2A- and α2C-adrenoceptors and the six chimeric α2A-/α2C-adrenoceptors were transiently transfected into human embryonic kidney 293 (HEK293) cells, and the expression levels were investigated by radioligand binding. The results show that the C-terminal half of the α2C-adrenoceptor, ranging from the second extracellular loop to the C-terminus, is the main determinant of the low expression level of binding-competent α2C-adrenoceptors in HEK293 cell membranes. The so-called retention signal in the N-terminus of the α2C-adrenoceptor had a less profound effect on the expression levels of the chimeric receptors. For seven drugs competing for [(3)H]-RX821002 binding, the K i values were determined at the wild-type α2A- and α2C-adrenoceptors and at four of the chimeric α2A-/α2C-adrenoceptors. The results show that the α2C- over α2A-selectivity of spiroxatrine, spiperone, clozapine, MK912, and chlorpromazine, as well as the α2A- over α2C-selectivity of BRL44408, resides mainly in the C-terminal half of the receptors. To some extent, the region comprising the N-terminal half of the receptors contributed to the α2C-selectivity of spiperone, clozapine, and chlorpromazine.

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Section: Incorporating Epitopes In the N-terminus Influence Receptor mentioning

confidence: 94%