Cited by 58Receptor Mechanisms and SignalingGastrointestinal motility and disordersNeuropeptides and Animal Physiology

Characterization and distribution of alpha 2-adrenergic receptors in the human intestinal mucosa.

Open access
Valet, P, Senard, J M, Devedjian, J C, Planat, V, Salomon, R, Voisin, T, Drean, G, Couvineau, A +2 more·1993·Journal of Clinical Investigation

Abstract

The subtype and the expression of the alpha 2-adrenergic receptor were investigated in the normal mucosa from human intestine by means of radioligand binding, RNase mapping, and measurement of adenylate cyclase activity. The study of the binding of the alpha 2-adrenergic antagonist, [3H]RX821002, to epithelial cell membranes indicated the existence of a single class of noninteracting sites displaying a high affinity for the radioligand (Kd = 1.1 +/- 0.5 nM). The rank order of potency of antagonists to inhibit [3H]RX821002 binding (RX821002 > yohimbine = rauwolscine > phentolamine approximately idazoxan >> chlorpromazine > prazosin) suggested that the receptor is of the alpha 2A subtype. A conclusion which is confirmed by the fact that only alpha 2C10 transcripts were found in the human intestine mucosa. Competition curves with (-)-norepinephrine demonstrated that 60% of the receptor population exhibited high affinity for agonists. This high-affinity state was abolished by the addition of GTP plus Na+ or by prior treatment of the membranes with pertussis toxin indicating it corresponded to G protein-coupled receptors. [32P]ADP-ribosylation and immunoblotting experiments identified two pertussis toxin-sensitive G proteins corresponding to Gi2 and Gi3. The study of the distribution of the receptor indicated that (a) the proximal colon is the intestine segment exhibiting the highest receptor density and (b) the receptor is predominantly expressed in crypts and is preferentially located in the basolateral membrane of the polarized cell. The distribution of the receptor along the crypt-surface axis of the colon mucosa can be correlated with a higher level of alpha 2C10-specific mRNA and a higher efficiency of UK14304 to inhibit adenylate cyclase in crypt cells.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1172/jci116427

Cites

50 of 50 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Autoinducer 3 can stimulate norepinephrine receptors on the surface of eukaryotic cells, and α-2 receptors are present on the brush border of human enterocytes.

    “For example, autoinducer 3 can stimulate nor epinephrine receptors on the surface of eukaryotic cells, and α-2 receptors are present on the brush border of human enterocytes.51”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 2

  1. Pamucku, R., and E. B. Chang. 1990. Alpha2-adrenergic agonists as anti- diarrhoeal agents: a review of physiological and cellular mechanisms. In Text- book of Secretory Diarrhoea. Volume 28. E. Lebenthal and M. Duffey, editors. Raven Press, New York. 383-393.
  2. Simonds, W. F., P. K. Goldsmith, J. Codina, C. G. Unson, and A. M. Spiegel. 1989. Gi2 mediates a2-adrenergic inhibition ofadenylate cyclase in plate- let membranes: in situ identification with Ga C-terminal antibodies. Proc. Nail. Acad. Sci. USA. 86:7809-7813.

Cited by

Sorted by citations

Authors
Valet, P., Senard, J. M., Devedjian, J. C., Planat, V, Salomon, R., Voisin, T., Drean, G., Couvineau, A., Daviaud, D., & Denis, C.
Affiliations
Inserm (FR)
Venue
Journal of Clinical Investigation
Published
1993-05-01
Volume
91
Issue
5
Pages
2049-2057
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2070409051
Cited by
58
References
50
Citations by year
2024: 3 · 2023: 1 · 2022: 2 · 2021: 4 · 2020: 1 · 2019: 1 · 2018: 3 · 2016: 2 · 2015: 1
FWCI
0.52
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
  • Health Sciences › Medicine › Gastroenterology › Gastrointestinal motility and disorders
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
Keywords
alpha2-adrenoceptors, human intestinal mucosa, colon, crypt, receptor distribution, G protein-coupled receptors, Gi2, Gi3, adenylate cyclase, RX821002, pertussis toxin, basolateral membrane, epithelial cells
MeSH terms
Adenylyl Cyclase Inhibitors, Brimonidine Tartrate, Adenosine Diphosphate Ribose, Adrenergic alpha-Agonists, Adrenergic alpha-Antagonists, Binding, Competitive, Cell Membrane, Colon, Dioxanes, Duodenum, Epinephrine, Epithelium, Humans, Intestinal Mucosa, Kinetics, Microvilli, NAD, Organ Specificity, Virulence Factors, Bordetella, Quinoxalines, Receptors, Adrenergic, alpha, RNA, Messenger, Idazoxan, Pertussis Toxin, Adenylate Cyclase Toxin

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review