Histamine H3 receptor

Source: Wikipedia, the free encyclopedia.
HRH3
Identifiers
Gene ontology
Molecular function
Cellular component
Biological process
Sources:Amigo / QuickGO
Ensembl
UniProt
RefSeq (mRNA)

NM_007232

NM_133849

RefSeq (protein)

NP_009163

NP_598610

Location (UCSC)Chr 20: 62.21 – 62.22 MbChr 2: 179.74 – 179.75 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

Histamine H3 receptors are expressed in the

noradrenaline, histamine and serotonin
.

The gene sequence for H3 receptors expresses only about 22% and 20% homology with both H1 and H2 receptors respectively.

There is much interest in the histamine H3 receptor as a potential therapeutic target because of its involvement in the neuronal mechanism behind many cognitive disorders and especially its location in the central nervous system.[6][7]

Tissue distribution

Function

Like all histamine receptors, the H3 receptor is a

N-type voltage gated calcium channels
, to reduce action potential mediated influx of calcium and hence reduce neurotransmitter release. H3 receptors function as presynaptic
autoreceptors on histamine-containing neurons.[8]

The diverse expression of H3 receptors throughout the cortex and subcortex indicates its ability to modulate the release of a large number of neurotransmitters.

H3 receptors are thought to play a part in the control of satiety.[9]

Isoforms

There are at least six H3 receptor

isoforms in the human, and more than 20 discovered so far.[10] In rats there have been six H3receptor subtypes identified so far. Mice also have three reported isoforms.[11]
These subtypes all have subtle difference in their pharmacology (and presumably distribution, based on studies in rats) but the exact physiological role of these isoforms is still unclear.

Pharmacology

Histamine

Agonists

There are currently no therapeutic products acting as selective agonists for H3 receptors, although there are several compounds used as research tools which are reasonably selective agonists. Some examples are:

Antagonists

These include:[13]

Therapeutic potential

The H3-receptor is a promising potential therapeutical target for many (cognitive) disorders that are caused by a histaminergic H3R dysfunction, because it is linked to the central nervous system and its regulation of other neurotransmitters.[6][16][17] Examples of such disorders are: sleep disorders (including narcolepsy), Tourette syndrome, Parkinson, OCD, ADHD, ASS and drug addictions.[6][17]

This receptor has been proposed as a target for treating sleep disorders.[18] The receptor has also been proposed as a target for treating neuropathic pain.[19]

Because of its ability to modulate other neurotransmitters, H3 receptor

glutamate and histamine).[20][7]

There is also evidence that the H3-receptor plays an important role in Tourette syndrome.[21] Mouse-models and other research demonstrated that reducing histamine concentration in the H3R causes tics, but adding histamine in the striatum decreases the symptoms.[22][23][24] The interaction between histamine (H3-receptor) and dopamine as well as other neurotransmitters is an important underlying mechanism behind the disorder.[25]

History


See also

References

  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000101180Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000039059Ensembl, May 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. PMID 2172771
    .
  6. ^ a b c Rapanelli, Maximiliano. “The Magnificent Two: Histamine and the H3 Receptor as Key Modulators of Striatal Circuitry.” Progress in Neuro-Psychopharmacology and Biological Psychiatry 73 (February 2017): 36–40
  7. ^ a b Sadek, Bassem, Ali Saad, Adel Sadeq, Fakhreya Jalal, and Holger Stark. “Histamine H3 Receptor as a Potential Target for Cognitive Symptoms in Neuropsychiatric Diseases.” Behavioural Brain Research 312 (October 2016): 415–430
  8. ^ "InterPro: IPR003980 Histamine H3 receptor". InterPro. European Bioinformatics Institute.
  9. PMID 11459437
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  16. ^ Bolam, J. Paul, and Tommas J. Ellender. “Histamine and the Striatum.” Neuropharmacology 106 (July 2016): 74–84
  17. ^ a b Sadek, Bassem, Ali Saad, Adel Sadeq, Fakhreya Jalal, and Holger Stark. “Histamine H3 Receptor as a Potential Target for Cognitive Symptoms in Neuropsychiatric Diseases.” Behavioural Brain Research 312 (October 2016): 415–430
  18. PMID 15530639
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  21. ^ Cox, Joanna H., Stefano Seri, and Andrea E. Cavanna. “Histaminergic Modulation in Tourette Syndrome.” Expert Opinion on Orphan Drugs 4, no. 2 (February 1, 2016): 205–213
  22. ^ Bolam, J. Paul, and Tommas J. Ellender. “Histamine and the Striatum.” Neuropharmacology 106 (July 2016): 74–84
  23. ^ Rapanelli, Maximiliano, Luciana Frick, Haruhiko Bito, and Christopher Pittenger. “Histamine Modulation of the Basal Ganglia Circuitry in the Development of Pathological Grooming.” Proceedings of the National Academy of Sciences (June 5, 2017): 6599–6604
  24. ^ Rapanelli, Maximiliano, and Christopher Pittenger. “Histamine and Histamine Receptors in Tourette Syndrome and Other Neuropsychiatric Conditions.” Neuropharmacology 106 (July 2016): 85–90
  25. ^ Baldan, Lissandra Castellan, Kyle A. Williams, Jean-Dominique Gallezot, Vladimir Pogorelov, Maximiliano Rapanelli, Michael Crowley, George M. Anderson, et al. “Histidine Decarboxylase Deficiency Causes Tourette Syndrome: Parallel Findings in Humans and Mice.” Neuron 81, no. 1 (January 8, 2014): 77–90
  26. S2CID 4302564
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Further reading

External links