Molecular cloning and pharmacology of functionally distinct isoforms of the human histamine H(3) receptor
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Molecular cloning and pharmacology of functionally distinct isoforms of the human histamine H(3) receptor. / Wellendorph, Petrine; Goodman, M W; Burstein, E S; Nash, N R; Brann, M R; Weiner, D M.
In: Neuropharmacology, Vol. 42, No. 7, 06.2002, p. 929-40.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Molecular cloning and pharmacology of functionally distinct isoforms of the human histamine H(3) receptor
AU - Wellendorph, Petrine
AU - Goodman, M W
AU - Burstein, E S
AU - Nash, N R
AU - Brann, M R
AU - Weiner, D M
PY - 2002/6
Y1 - 2002/6
N2 - The pharmacology of histamine H(3) receptors suggests the presence of distinct receptor isoforms or subtypes. We herein describe multiple, functionally distinct, alternatively spliced isoforms of the human H(3) receptor. Combinatorial splicing at three different sites creates at least six distinct receptor isoforms, of which isoforms 1, 2, and 4, encode functional proteins. Detailed pharmacology on isoforms 1 (unspliced receptor), and 2 (which has an 80 amino acid deletion within the third intracellular loop of the protein) revealed that both isoforms displayed robust responses to a series of known H(3) agonists, while all agonists tested displayed increased potency at isoform 2 relative to isoform 1. Histamine, N(alpha)-methylhistamine, and R(-) and S(+)-alpha-methylhistamine are 16-23-fold more potent, while immepip and imetit are three to fivefold more potent. Antagonist experiments revealed a rank order of potency at both isoforms of clobenpropit>iodophenpropit>thioperamide, and these drugs are fivefold less potent at isoform 2 than isoform 1. To further explore the pharmacology of H(3) receptor function, we screened 150 clinically relevant neuropsychiatric drugs for H(3) receptor activity, and identified a small number of antipsychotics that possess significant antagonist activity.
AB - The pharmacology of histamine H(3) receptors suggests the presence of distinct receptor isoforms or subtypes. We herein describe multiple, functionally distinct, alternatively spliced isoforms of the human H(3) receptor. Combinatorial splicing at three different sites creates at least six distinct receptor isoforms, of which isoforms 1, 2, and 4, encode functional proteins. Detailed pharmacology on isoforms 1 (unspliced receptor), and 2 (which has an 80 amino acid deletion within the third intracellular loop of the protein) revealed that both isoforms displayed robust responses to a series of known H(3) agonists, while all agonists tested displayed increased potency at isoform 2 relative to isoform 1. Histamine, N(alpha)-methylhistamine, and R(-) and S(+)-alpha-methylhistamine are 16-23-fold more potent, while immepip and imetit are three to fivefold more potent. Antagonist experiments revealed a rank order of potency at both isoforms of clobenpropit>iodophenpropit>thioperamide, and these drugs are fivefold less potent at isoform 2 than isoform 1. To further explore the pharmacology of H(3) receptor function, we screened 150 clinically relevant neuropsychiatric drugs for H(3) receptor activity, and identified a small number of antipsychotics that possess significant antagonist activity.
KW - Amino Acid Sequence
KW - Animals
KW - Base Sequence
KW - Cloning, Molecular
KW - DNA Primers
KW - Guinea Pigs
KW - Humans
KW - Methylhistamines
KW - Molecular Sequence Data
KW - Protein Isoforms
KW - RNA Splicing
KW - Rats
KW - Receptors, Histamine H3
KW - Reverse Transcriptase Polymerase Chain Reaction
KW - Sequence Alignment
KW - Sequence Deletion
KW - Sequence Homology, Amino Acid
KW - Structure-Activity Relationship
M3 - Journal article
C2 - 12069903
VL - 42
SP - 929
EP - 940
JO - Neuropharmacology
JF - Neuropharmacology
SN - 0028-3908
IS - 7
ER -
ID: 138314969