Production and characterization of an anti-serotonin 1A receptor antibody which detects functional 5-HT(1A) binding sites

Feng Zhou, Tushar D. Patel, Darl Swartz, Yi Xu, Mark Kelley

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

We describe the production and characterization of a specific anti-5-HT(1A) receptor antibody made against a fusion protein consisting of glutathione-S-transferase (GST) coupled to a 75-amino acid sequence from the middle portion of the third intracellular loop (5-HT(1A)-m3i, serine253-arginine327) of the rat 5-HT(1A) receptor protein. This region was chosen to avoid putative phosphorylation and glycosylation sites and regions of known homology with other 5-HT receptors. Western blot analysis indicated that the polyclonal anti-5-HT(1A)-m3i antibody accurately recognized the fusion protein expressed in bacteria and labeled a prominent 67 kDa protein band in the hippocampus, cortex, brainstem, cerebellum and kidney with a density profile corresponding to the relative abundance of the 5-HT(1A) receptor in these tissues. No protein was detected in liver or muscle tissue preparations, and no protein bands were labeled in any of the above tissues following preabsorption of the antibody with the 5-HT(1A)-m3i fusion protein. Immunohistochemistry revealed prominent labeling in limbic structures including the hippocampus, amygdala, entorhinal cortex, and septum as well as in raphe nuclei. In the hippocampus, 5-HT(1A)-m3i labeling revealed a characteristic laminar pattern that coincided with that seen by autoradiographic binding of the 5-HT(1A) agonist [3H]-8-OH-DPAT in all strata of the hippocampal formation. In the dorsal and medial raphe nuclei, anti-5-HT(1A)-m3i antibodies labeled the somatodendritic membranes of 5-HT neurons, consistent with its role as an autoreceptor. The detailed matching of the anti-5-HT(1A)-m3i antibody with [3H]-8-OH-DPAT binding suggests that the antibody recognizes a functionally active form of the 5-HT(1A) receptor protein capable of binding 5-HT(1A) agonist ligands. These anti-5-HT(1A) antibodies may therefore be useful tools in localizing functional 5-HT(1A) receptors in specific regions of the brain as well as in studying the plasticity and ontogeny of the 5-HT(1A) receptor at the cellular and subcellular level. Copyright (C) 1999 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)186-201
Number of pages16
JournalMolecular Brain Research
Volume69
Issue number2
DOIs
StatePublished - Jun 8 1999

Fingerprint

Receptor, Serotonin, 5-HT1A
Serotonin
Binding Sites
Antibodies
Hippocampus
Proteins
8-Hydroxy-2-(di-n-propylamino)tetralin
Serotonin Receptor Agonists
Mediodorsal Thalamic Nucleus
Autoreceptors
Entorhinal Cortex
Raphe Nuclei
Serotonin Receptors
Amygdala
Glutathione Transferase
Glycosylation
Protein Binding
Cerebellum
Brain Stem
Amino Acid Sequence

Keywords

  • 8-OH-DPAT
  • Autoinnervation
  • Autoradiography
  • Fusion protein
  • Hippocampus
  • Immunocytochemistry
  • Limbic system

ASJC Scopus subject areas

  • Molecular Biology
  • Cellular and Molecular Neuroscience

Cite this

Production and characterization of an anti-serotonin 1A receptor antibody which detects functional 5-HT(1A) binding sites. / Zhou, Feng; Patel, Tushar D.; Swartz, Darl; Xu, Yi; Kelley, Mark.

In: Molecular Brain Research, Vol. 69, No. 2, 08.06.1999, p. 186-201.

Research output: Contribution to journalArticle

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