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. 1993 Sep;110(1):54–60. doi: 10.1111/j.1476-5381.1993.tb13771.x

Cloning and expression of a fish alpha 2-adrenoceptor.

S P Svensson 1, T J Bailey 1, D J Pepperl 1, N Grundström 1, S Ala-Uotila 1, M Scheinin 1, J O Karlsson 1, J W Regan 1
PMCID: PMC2176002  PMID: 7693288

Abstract

1. Pigment granule aggregation in specialized cells (melanophores) from the skin of teleost fishes has been shown to be mediated by receptors with an alpha 2-adrenoceptor pharmacology. We now report the cloning of the alpha 2-F, a fish skin alpha 2-receptor from the cuckoo wrasse (Labrus ossifagus). 2. Degenerate oligonucleotides corresponding to conserved regions of the human alpha 2-adrenoceptor subtypes were used in a polymerase chain reaction (PCR) with cDNA prepared from mRNA isolated subtypes were used in a polymerase chain reaction (PCR) with cDNA prepared from mRNA isolated from the skin of the cuckoo wrasse. An 876 base pair (bp) product was obtained that was homologous with that of the human alpha 2-adrenoceptor and was used to screen a genomic library from the cuckoo wrasse. 3. A clone (pTB17BS) consisting of approximately 5 kb of genomic DNA was obtained which contained the nucleotide sequence of the initial PCR product. In addition, it contained an open reading frame that encoded a protein of 432 amino acids and approximately 2 kb of 5'untranslated sequence. The deduced amino acid sequence of this protein showed 47-57% identity with the human alpha 2-adrenoceptors and thus appeared to encode a fish alpha 2-adrenoceptor. 4. In the 5'-untranslated region of the gene, nucleotide sequences were present suggesting that transcription of the alpha 2-F might be regulated by cyclic AMP, calcium and/or steroids. 5. The alpha 2-F was expressed in COS-7 cells and radioligand binding studies were performed with [3H]-rauwolscine.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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