Histamine H3 Antagonists as Wake-Promoting and Pro-Cognitive Agents

Stocking, Emily M.; Letavic, Michael A.

doi:10.2174/156802608784936728

Cited by 54 publications

(38 citation statements)

References 85 publications

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“…in gastrointestinal tract, airways and cardiovascular system. 6) Molecular aspects of the receptor, [7][8][9][10] structure-activity relationships (SAR) of ligands, [11][12][13][14][15][16][17][18][19] and pharmacology [20][21][22][23][24][25][26] have recently been resumed in many excellent reviews. This contribution focuses on the development of clinical candidates and the multifaceted potential indications targeted.…”

Section: Auto-and Heteroreceptormentioning

confidence: 99%

Histamine H3 Receptor Antagonists Go to Clinics

Sander

Kottke

Stark

2008

Biological & Pharmaceutical Bulletin

185

118

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INTRODUCTIONThe biogenic amine histamine, 2-(1H-imidazol-4-yl)-ethanamine, is produced by decarboxylation of L-histidine and is implicated in a wide range of physiological and pathophysiological functions. It is metabolised by histamine N tmethyltransferase (HMT) and mono-or diaminoxidase. Histamine is mainly acting via four distinct metabotropic histamine receptor subtypes (H 1 R-H 4 R), which have meanwhile all been cloned. Whereas antagonists for H 1 R and H 2 R subtypes have been blockbusters in therapy of allergy and ulcer, respectively, antagonists for H 3 R and H 4 R subtypes are not on the market. The recently described H 4 R seems to be involved in inflammatory and immunomodulatory processes. H 3 Rs play a central role in neurotransmission of histamine and in control of many other neurotransmitters. Several antagonists are in preclinical and some in clinical stage of development. PHARMACOLOGICAL BACKGROUND Auto-and HeteroreceptorThe H 3 R was first described in 1983 as a presynaptic autoreceptor, which mediates synthesis of histamine and inhibition of its release from histaminergic neurons in slices of rat cerebral cortex. 1) Localisation studies in rodents show a predominance in distinct regions of the central nervous system (CNS) as the H 3 R is mainly located in cerebral cortex, hippocampus, amygdala, nucleus accumbens, globus pallidus, striatum, and hypothalamus 2-5) ( Fig. 1). In addition, it is expressed in the peripheral nervous system, e.g. in gastrointestinal tract, airways and cardiovascular system. 6) Molecular aspects of the receptor, [7][8][9][10] structure-activity relationships (SAR) of ligands, [11][12][13][14][15][16][17][18][19] and pharmacology [20][21][22][23][24][25][26] have recently been resumed in many excellent reviews. This contribution focuses on the development of clinical candidates and the multifaceted potential indications targeted.In mammalian brain histaminergic neurons originate in the tuberomammillary nucleus (TMN) spreading into above mentioned brain regions, where they control histamine levels by regulation of synthesis and liberation rates 27) and modulate different neuronal systems. 28) H 3 R expression is not solely restricted to histaminergic neurons: due to its function as a heteroreceptor it can be found on colocalised neurons, and H 3 R activation modulates the release of various important neurotransmitters, i.e. dopamine, [29][30][31][32][33] acetylcholine, [34][35][36][37] norepinephrine, 38,39) serotonin, 40,41) GABA, [42][43][44] glutamate, 45) and substance P. [46][47][48] Therefore, histaminergic neurons and the cross-linkage between major neurotransmitter systems are involved in many (patho)physiological brain functions, including vigilance, memory processes, feeding behaviour and locomotor activity (Fig. 2). Interneuron cross-talk and adaptive processes seem to be important factors in H 3 Rmediated signalling. Molecular AspectsThe human histamine H 3 receptor (hH 3 R) cDNA firstly described 1999 encodes a 445 amino acid protein and belongs to the his...

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Section: Auto-and Heteroreceptormentioning

confidence: 99%

Histamine H3 Receptor Antagonists Go to Clinics

Sander

Kottke

Stark

2008

Biological & Pharmaceutical Bulletin

185

118

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“…Antagonists and inverse agonists of the H3 histamine receptor subtype promote histamine release and have the potential to improve cognitive performance in neurodegenerative conditions Bacciottini et al 2001;Witkin and Nelson 2004;Arrang et al 2007) potentially without response tachyphylaxis typically associated with agonists. Since histamine exerts its CNS alerting effect, in part, by activating acetylcholine neurons Esbenshade et al 2008;Stocking and Letavic 2008;Passani et al 2001), the effectiveness of a histamine H3 receptor antagonist or inverse agonist may be enhanced by combined use with acetylcholinesterase inhibitors.…”

Section: Introductionmentioning

confidence: 99%

Additive effects of a cholinesterase inhibitor and a histamine inverse agonist on scopolamine deficits in humans

Cho

Maruff²,

Connell³

et al. 2011

Psychopharmacology

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“…Mutual interactions with these other transmitter systems form a network that links basic homeostatic and higher brain functions, including sleep-wake regulation, circadian and feeding rhythms, immunity, attention, learning, and memory (3)(4)(5)(6)(7)(8)(9). H3 receptor IAs may thus be efficacious in the treatment of various CNS disorders (10,11).…”

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confidence: 99%

¹¹C-MK-8278 PET as a Tool for Pharmacodynamic Brain Occupancy of Histamine 3 Receptor Inverse Agonists

et al. 2013

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The histamine 3 (H3) receptor is a presynaptic autoreceptor in the central nervous system that regulates the synthesis and release of histamine and modulates the release of other major neurotransmitters. H3 receptor inverse agonists (IAs) may be efficacious in the treatment of various central nervous system disorders, including excessive daytime sleepiness, attention deficit hyperactivity disorder, Alzheimer disease, ethanol addiction, and obesity. Methods: Using PET and a novel high-affinity and selective radioligand 11 C-MK-8278, we studied the tracer biodistribution, quantification, and brain H3 receptor occupancy (RO) of MK-0249 and MK-3134, 2 potential IA drugs targeting cerebral H3 receptors, in 6 healthy male subjects (age, 19-40 y). The relationship among H3 IA dose, time on target, and peripheral pharmacokinetics was further investigated in 15 healthy male volunteers (age, 18-40 y) with up to 3 PET scans and 3 subjects per dose level. Results: The mean effective dose for 11 C-MK-8278 was 5.4 6 1.1 mSv/MBq. Human brain kinetics showed rapid high uptake and fast washout. Binding potential values can be assessed using the pons as a reference region, with a test-retest repeatability of 7%. Drug RO data showed low interindividual variability per dose (mean RO SD, 2.1%), and a targeted 90% RO can be reached for both IAs at clinically feasible doses. Conclusion: 11 C-MK-8278 is a useful novel PET radioligand for determination of human cerebral H3 receptor binding and allows highly reproducible in vivo brain occupancy of H3-targeting drugs, hereby enabling the evaluation of novel compounds in early development to select doses and schedules. Hi stamine is an aminergic neurotransmitter that is localized in the central nervous system (CNS) and in peripheral tissues such as the gut, skin, and immune system. In the brain, histaminergic neurons originate in the tuberomammillary nucleus of the hypothalamus and project throughout the CNS, including the thalamus, hypothalamus, cerebral cortex, striatum, medulla oblongata, and spinal cord. There are 4 known G-protein-coupled histamine receptor subtypes (H1-H4). These serve multiple functions in the brain, particularly control of excitability and plasticity. Type 1 and 2 histamine receptor-mediated actions are mostly excitatory. The H3 receptor was discovered in 1983 and cloned at the end of the twentieth century (1) and is mainly expressed in the CNS. H3 receptors predominate in the basal ganglia, with the highest densities in the globus pallidus (2). The H3 receptor is a presynaptic inhibitory autoreceptor that regulates the synthesis and release of histamine and also modulates the release of several other neurotransmitters such as acetylcholine, norepinephrine, serotonin, dopamine, and g aminobutyric acid. Like other G-protein-coupled receptors, H3 receptors signal constitutively, serving to tonically suppress histamine production at baseline. Agonist-induced signaling, such as that which occurs in the presence of elevated histamine levels, further suppresses histamine...

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Histamine H3 Antagonists as Wake-Promoting and Pro-Cognitive Agents

Cited by 54 publications

References 85 publications

Histamine H3 Receptor Antagonists Go to Clinics

Histamine H3 Receptor Antagonists Go to Clinics

Additive effects of a cholinesterase inhibitor and a histamine inverse agonist on scopolamine deficits in humans

¹¹C-MK-8278 PET as a Tool for Pharmacodynamic Brain Occupancy of Histamine 3 Receptor Inverse Agonists

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Histamine H3 Antagonists as Wake-Promoting and Pro-Cognitive Agents

Cited by 54 publications

References 85 publications

Histamine H3 Receptor Antagonists Go to Clinics

Histamine H3 Receptor Antagonists Go to Clinics

Additive effects of a cholinesterase inhibitor and a histamine inverse agonist on scopolamine deficits in humans

11C-MK-8278 PET as a Tool for Pharmacodynamic Brain Occupancy of Histamine 3 Receptor Inverse Agonists

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¹¹C-MK-8278 PET as a Tool for Pharmacodynamic Brain Occupancy of Histamine 3 Receptor Inverse Agonists