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Sari S, Barut B, Marcinkowska M, Sabuncuoğlu S, Avci A, Koçak Aslan E, Özel A, Siwek A. Potential of nafimidone derivatives against co-morbidities of epilepsy: In vitro, in vivo, and in silico investigations. Drug Dev Res 2021; 83:184-193. [PMID: 34291476 DOI: 10.1002/ddr.21858] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 07/10/2021] [Accepted: 07/13/2021] [Indexed: 11/12/2022]
Abstract
Nafimidone is known for its clinical antiepileptic effects and alcohol derivatives of nafimidone were reported be potent anticonvulsants. These compounds are structurally similar to miconazole, which is known to inhibit cholinesterases, protect neurons, and ameliorate cognitive decline. Herein, we aimed to reveal the potential of three nafimidone alcohol esters (5 g, 5i, and 5 k), which were previously reported for their anticonvulsant effects, against co-morbidities of epilepsy such as inflammatory and neuropathic pain, cognitive and behavioral deficits, and neuron death, and understand their roles in related pathways such as γ-butyric acid type A (GABAA ) receptor and cholinesterases using in vitro, in vivo and in silico methods. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) test was used for cytotoxicity evaluation, hippocampal slice culture assay for neuroprotection, formalin test for acute and inflammatory pain, sciatic ligation for neuropathic pain, Morris water maze and open field locomotor tasks for cognitive and behavioral deficits, radioligand binding for GABAA receptor affinity, spectrophotometric methods for cholinesterase inhibition in vitro, and molecular docking in silico. The compounds were non-toxic to fibroblast cells. 5 k was neuroprotective against kainic acid-induced neuron death. 5i reduced pain response of mice in both the acute and the inflammatory phases. 5i improved survival upon status epilepticus. The compounds showed no affinity to GABAA receptor but inhibited acetylcholinesterase, 5 k also inhibited butyrylcholinesterase. The compounds were predicted to interact mainly with the peripheric anionic site of cholinesterase enzymes. The title compounds showed neuroprotective, analgesic, and cholinesterase inhibitory effects, thus they bear promise against certain co-morbidities of epilepsy with neurological insults.
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Szczepańska K, Pockes S, Podlewska S, Höring C, Mika K, Latacz G, Bednarski M, Siwek A, Karcz T, Nagl M, Bresinsky M, Mönnich D, Seibel U, Kuder KJ, Kotańska M, Stark H, Elz S, Kieć-Kononowicz K. Structural modifications in the distal, regulatory region of histamine H 3 receptor antagonists leading to the identification of a potent anti-obesity agent. Eur J Med Chem 2021; 213:113041. [PMID: 33261900 DOI: 10.1016/j.ejmech.2020.113041] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 11/07/2020] [Accepted: 11/16/2020] [Indexed: 01/04/2023]
Abstract
A series of 4-pyridylpiperazine derivatives with varying regulatory region substituents proved to be potent histamine H3 receptor (H3R) ligands in the nanomolar concentration range. The most influential modification that affected the affinity toward the H3R appeared by introducing electron-withdrawing moieties into the distal aromatic ring. In order to finally discuss the influence of the characteristic 4-pyridylpiperazine moiety on H3R affinity, two Ciproxifan analogues 2 and 3 with a slight modification in their basic part were obtained. The replacement of piperazine in 3 with piperidine in compound 2, led to slightly reduced affinity towards the H3R (Ki = 3.17 and 7.70 nM, respectively). In fact, 3 showed the highest antagonistic properties among all compounds in this series, hence affirming our previous assumptions, that the 4-pyridylpiperazine moiety is the key element for suitable interaction with the human histamine H3 receptor. While its structural replacement to piperidine is also tolerated for H3R binding, the heteroaromatic 4-pyridyl moiety seems to be essential for proper ligand-receptor interaction. The putative protein-ligand interactions responsible for their high affinity were demonstrated using molecular modeling techniques. Furthermore, selectivity, intrinsic activity at the H3R, as well as drug-like properties of ligands were evaluated using in vitro methods. Moreover, pharmacological in vivo test results of compound 9 (structural analogue of Abbott's A-331440) clearly indicate that it may affect the amount of calories consumed, thus act as an anorectic compound.
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Sałaciak K, Głuch-Lutwin M, Siwek A, Szafarz M, Kazek G, Bednarski M, Nowiński L, Mitchell E, Jastrzębska-Więsek M, Partyka A, Wesołowska A, Kołaczkowski M, Szkaradek N, Marona H, Sapa J, Pytka K. The antidepressant-like activity of chiral xanthone derivatives may be mediated by 5-HT1A receptor and β-arrestin signalling. J Psychopharmacol 2020; 34:1431-1442. [PMID: 33103555 DOI: 10.1177/0269881120959605] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
BACKGROUND Our previous studies showed that xanthone derivatives with N-(2-methoxyphenyl)piperazine fragment have an affinity to the 5-HT1A receptor and show antidepressant-like properties in rodents. In this study, we tested three xanthone derivatives, HBK-1 (R, S) and its enantiomers, in which we increased the distance between the piperazine and xanthone fragments by using a hydroxypropoxy linker. We hypothesized that this would increase the binding to the 5-HT1A receptor and consequently, pharmacological activity. AIMS We aimed to assess the in vitro and in vivo pharmacological activity of the xanthone derivatives. METHODS We evaluated the in vitro affinity for serotonin 5-HT1A and 5-HT2A receptors and serotonin transporter. We also determined the intrinsic activity at the 5-HT1A receptor. We investigated the antidepressant-like properties and safety after acute administration (dose range: 1.25-20 mg/kg) using the forced swim, tail suspension, locomotor activity, rotarod and chimney tests in mice. We also evaluated the basic pharmacokinetic parameters. RESULTS Our results indicated that the compounds showed a high affinity for the 5-HT1A receptor but very weak antagonistic properties in the Ca2+ mobilization assay; however, they showed significant agonistic properties in the β-arrestin recruitment assay. In both behavioural tests the studied xanthone derivatives showed antidepressant-like activity. Pre-treatment with p-chlorophenylalanine or WAY-100635 abolished their antidepressant-like activity. None of the compounds caused motor impairments at antidepressant-like doses. The racemate penetrated the blood-brain barrier and had a relatively high bioavailability after intraperitoneal administration. CONCLUSIONS Xanthone derivatives with N-(2-methoxyphenyl)piperazine fragment and hydroxypropoxy linker show increased binding to the 5-HT1A receptor and may represent an attractive putative treatment candidate for depression.
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Grosicki M, Adami M, Micheloni C, Głuch-Lutwin M, Siwek A, Latacz G, Łażewska D, Więcek M, Reiner-Link D, Stark H, Chlopicki S, Kieć-Kononowicz K. Eosinophils adhesion assay as a tool for phenotypic drug screening - The pharmacology of 1,3,5 - Triazine and 1H-indole like derivatives against the human histamine H 4 receptor. Eur J Pharmacol 2020; 890:173611. [PMID: 33017589 DOI: 10.1016/j.ejphar.2020.173611] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 09/22/2020] [Accepted: 09/28/2020] [Indexed: 11/18/2022]
Abstract
Histamine is a pleiotropic biogenic amine, having affinity towards four distinct histamine receptors. The existing pharmacological studies suggest the usefulness of histamine H4 receptor ligands in the treatment of many inflammatory and immunomodulatory diseases, including allergic rhinitis, asthma, atopic dermatitis, colitis or pruritus. Up to date, several potent histamine H4 receptor ligands were developed, none of which was registered as a drug yet. In this study, a series of potent indole-like and triazine derivatives were tested, in radioligand displacement and functional assays at histamine H4 receptor, as well as in human eosinophils adhesion assay to endothelium. For selected compounds permeability, cytotoxicity, metabolic and in vivo studies were conducted. Adhesion assay differentiated the activity of different groups of compounds with a known affinity towards the histamine H4 receptor. Most of the tested compounds downregulated the number of adherent cells. However, adhesion assay revealed additional properties of tested compounds that had not been detected in radioligand displacement and aequorin-based functional assays. Furthermore, for some tested compounds, these abnormal effects were confirmed during the in vivo studies. In conclusion, eosinophils adhesion assay uncovered pharmacological activity of histamine H4 receptor ligands that has been later confirmed in vivo, underscoring the value of well-suited cell-based phenotypic screening approach in drug discovery.
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Key Words
- 1,3,5 – Triazine derivatives
- 1H-Indole like derivatives
- 1H-indole like derivatives
- Adhesion
- Endothelium
- Eosinophils
- Histamine
- Histamine receptors
- JN-25 (4-[(E)-2-(3-chlorophenyl)ethenyl]-6-(4-methylpiperazin-1-yl)-1,3,5-triazin-2-amine)
- JN-35 (4-(4-methylpiperazin-1-yl)-6-(3-phenylpropyl)-1,3,5-triazin-2-amine)
- JNJ10191584 (5-chloro-1H-benzo[d]imidazol-2-yl)(4-methylpiperazin-1-yl)methanone) Pub- Chem CID: 10446295)
- JNJ7777120 (5-chloro-1H-indol-2-yl)(4-methylpiperazin-1-yl)methanone) Pub- Chem CID: 4908365)
- KP-9D (2-(4-chlorophenyl)-4-(4-methylpiperazin-1-yl)-1,3,5-triazine)
- MWJ-3 (5-chloro-7-nitro-1H-indol-2-yl)(4-methylpiperazin-1-yl)methanone Pub- Chem CID: 70692530)
- TR-18 (4-(4-bromophenyl)-6-(4-methylpiperazin-1-yl)-1,3,5-triazin-2-amine)
- TR-7 (4-(4-chlorophenyl)-6-(4-methylpiperazin-1-yl)-1,3,5-triazin-2-amine)
- TR-AF-45 (4-(4-methylpiperazin-1-yl)-6-neopentyl-1,3,5-triazin-2-amine)
- TR-AF-49 (4-(cyclohexylmethyl)-6-(4-methylpiperazin-1-yl)-1,3,5-triazin-2-amine)
- TR-DL-20 (4-(1-cyclohexenylmethyl)-6-(4-methylpiperazin-1-yl)-1,3,5-triazin-2-amine)
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Sniecikowska J, Gluch-Lutwin M, Bucki A, Więckowska A, Siwek A, Jastrzebska-Wiesek M, Partyka A, Wilczyńska D, Pytka K, Latacz G, Przejczowska-Pomierny K, Wyska E, Wesołowska A, Pawłowski M, Newman-Tancredi A, Kolaczkowski M. Discovery of Novel pERK1/2- or β-Arrestin-Preferring 5-HT 1A Receptor-Biased Agonists: Diversified Therapeutic-like versus Side Effect Profile. J Med Chem 2020; 63:10946-10971. [PMID: 32883072 PMCID: PMC7586344 DOI: 10.1021/acs.jmedchem.0c00814] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
![]()
Novel 1-(1-benzoylpiperidin-4-yl)methanamine derivatives with high
affinity and selectivity for serotonin 5-HT1A receptors
were obtained and tested in four functional assays: ERK1/2 phosphorylation,
adenylyl cyclase inhibition, calcium mobilization, and β-arrestin
recruitment. Compounds 44 and 56 (2-methylaminophenoxyethyl
and 2-(1H-indol-4-yloxy)ethyl derivatives, respectively)
were selected as biased agonists with highly differential “signaling
fingerprints” that translated into distinct in vivo profiles. In vitro, 44 showed biased
agonism for ERK1/2 phosphorylation and, in vivo,
it preferentially exerted an antidepressant-like effect in the Porsolt
forced swimming test in rats. In contrast, compound 56 exhibited a first-in-class profile: it preferentially and potently
activated β-arrestin recruitment in vitro and
potently elicited lower lip retraction in vivo, a
component of “serotonergic syndrome”. Both compounds
showed promising developability properties. The presented 5-HT1A receptor-biased agonists, preferentially targeting various
signaling pathways, have the potential to become drug candidates for
distinct central nervous system pathologies and possessing accentuated
therapeutic activity and reduced side effects.
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Czopek A, Partyka A, Bucki A, Pawłowski M, Kołaczkowski M, Siwek A, Głuch-Lutwin M, Koczurkiewicz P, Pękala E, Jaromin A, Tyliszczak B, Wesołowska A, Zagórska A. Impact of N-Alkylamino Substituents on Serotonin Receptor (5-HTR) Affinity and Phosphodiesterase 10A (PDE10A) Inhibition of Isoindole-1,3-dione Derivatives. Molecules 2020; 25:molecules25173868. [PMID: 32854402 PMCID: PMC7504677 DOI: 10.3390/molecules25173868] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 08/22/2020] [Accepted: 08/23/2020] [Indexed: 11/16/2022] Open
Abstract
In this study, a series of compounds derived from 4-methoxy-1H-isoindole-1,3(2H)-dione, potential ligands of phosphodiesterase 10A and serotonin receptors, were investigated as potential antipsychotics. A library of 4-methoxy-1H-isoindole-1,3(2H)-dione derivatives with various amine moieties was synthesized and examined for their phosphodiesterase 10A (PDE10A)-inhibiting properties and their 5-HT1A and 5-HT7 receptor affinities. Based on in vitro studies, the most potent compound, 18 (2-[4-(1H-benzimidazol-2-yl)butyl]-4-methoxy-1H-isoindole-1,3(2H)-dione), was selected and its safety in vitro was evaluated. In order to explain the binding mode of compound 18 in the active site of the PDE10A enzyme and describe the molecular interactions responsible for its inhibition, computer-aided docking studies were performed. The potential antipsychotic properties of compound 18 in a behavioral model of schizophrenia were also investigated.
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Łażewska D, Bajda M, Kaleta M, Zaręba P, Doroz-Płonka A, Siwek A, Alachkar A, Mogilski S, Saad A, Kuder K, Olejarz-Maciej A, Godyń J, Stary D, Sudoł S, Więcek M, Latacz G, Walczak M, Handzlik J, Sadek B, Malawska B, Kieć-Kononowicz K. Rational design of new multitarget histamine H 3 receptor ligands as potential candidates for treatment of Alzheimer's disease. Eur J Med Chem 2020; 207:112743. [PMID: 32882609 DOI: 10.1016/j.ejmech.2020.112743] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Revised: 07/26/2020] [Accepted: 07/26/2020] [Indexed: 12/12/2022]
Abstract
Design and development of multitarget-directed ligands (MTDLs) has become a very important approach in the search of new therapies for Alzheimer's disease (AD). In our present research, a number of xanthone derivatives were first designed using a pharmacophore model for histamine H3 receptor (H3R) antagonists/inverse agonists, and virtual docking was then performed for the enzyme acetylcholinesterase. Next, 23 compounds were synthesised and evaluated in vitro for human H3R (hH3R) affinity and inhibitory activity on cholinesterases. Most of the target compounds showed hH3R affinities in nanomolar range and exhibited cholinesterase inhibitory activity with IC50 values in submicromolar range. Furthermore, the inhibitory effects of monoamine oxidases (MAO) A and B were investigated. The results showed low micromolar and selective human MAO B (hMAO B) inhibition. Two azepane derivatives, namely 23 (2-(5-(azepan-1-yl)pentyloxy)-9H-xanthen-9-one) and 25 (2-(5-(azepan-1-yl)pentyloxy)-7-chloro-9H-xanthen-9-one), were especially very promising and showed high affinity for hH3R (Ki = 170 nM and 100 nM respectively) and high inhibitory activity for acetylcholinesterase (IC50 = 180 nM and 136 nM respectively). Moreover, these compounds showed moderate inhibitory activity for butyrylcholinesterase (IC50 = 880 nM and 394 nM respectively) and hMAO B (IC50 = 775 nM and 897 nM respectively). Furthermore, molecular docking studies were performed for hH3R, human cholinesterases and hMAO B to describe the mode of interactions with these biological targets. Next, the two most promising compounds 23 and 25 were selected for in vivo studies. The results showed significant memory-enhancing effect of compound 23 in dizocilpine-induced amnesia in rats in two tests: step-through inhibitory avoidance paradigm (SIAP) and transfer latency paradigm time (TLPT). In addition, favourable analgesic effects of compound 23 were observed in neuropathic pain models. Therefore, compound 23 is a particularly promising structure for further design of new MTDLs for AD.
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Pańczyk K, Rapacz A, Furgała-Wojas A, Sałat K, Koczurkiewicz-Adamczyk P, Łucjanek M, Skiba-Kurek I, Karczewska E, Sowa A, Żelaszczyk D, Siwek A, Popiół J, Pękala E, Marona H, Waszkielewicz A. Anticonvulsant and analgesic in neuropathic pain activity in a group of new aminoalkanol derivatives. Bioorg Med Chem Lett 2020; 30:127325. [PMID: 32631530 DOI: 10.1016/j.bmcl.2020.127325] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 06/01/2020] [Accepted: 06/04/2020] [Indexed: 11/17/2022]
Abstract
As part of the presented research, thirteen new aminoalkanol derivatives were designed and obtained by chemical synthesis. In vivo studies (mice, i.p.) showed anticonvulsant activity (MES) of nine compounds, and in the case of one compound (R,S-trans-2-((2-(2,3,5-trimethylphenoxy)ethyl)amino)cyclohexan-1-ol, 4) both anticonvulsant (ED50 MES = 15.67 mg/kg, TD50 rotarod = 78.30 mg.kg, PI = 5.00) and analgesic activity (OXA-induced neuropathic pain, active at 15 mg/kg). For selected active compounds additional in vitro studies have been performed, including receptor studies (5-HT1A), evaluation of antioxidant activity (DPPH assay), metabolism studies as well as safety panel (mutagenicity, safety in relation to the gastrointestinal flora, cytotoxicity towards astrocytes as well as impact on their proliferation and cell cycle).
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Bieszczad B, Siwek A, Wilczek M, Trzybiński D, Woźniak K, Satała G, Bojarski AJ, Mieczkowski A. Synthesis, crystal structure and biological activity of novel analogues of tricyclic drugs. Bioorg Med Chem Lett 2020; 30:127493. [PMID: 32798652 DOI: 10.1016/j.bmcl.2020.127493] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 07/23/2020] [Accepted: 08/09/2020] [Indexed: 11/30/2022]
Abstract
A series of fourteen novel, eight-membered lactam- and dilactam-based analogues of tricyclic drugs were obtained in a simple one-pot procedure. Crystal structures of two compounds were determined by single-crystal X-ray diffraction analysis and their selected structural features were discussed and compared with those of imipramine and dibenzepine. Affinity of developed molecules for histamine receptor H1, serotonin receptors 5-HT1A, 5-HT2A, 5-HT6, 5-HT7, serotonin transporter (SERT) and dopamine receptor D2 was determined. The commercial drug dibenzepine was also checked on these molecular targets, as its mechanism of action is largely unknown. Two derivatives of 11,12-dihydrodibenzo[b,f]azocin-6(5H)-one (7,8) and two of dibenzo[b,f]azocin-6(5H)-one (9,10) were found to be active toward the H1 receptor in sub-micromolar concentrations.
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Piotrowska A, Siwek A, Wolak M, Nowak G. Analysis of Density Changes of Selected Brain Receptors After a 14-Day Supply of Chromium(III) and Evaluation of Chromium(III) Affinity to Selected Receptors and Transporters. Biol Trace Elem Res 2020; 196:359-364. [PMID: 31732929 PMCID: PMC7306032 DOI: 10.1007/s12011-019-01924-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2019] [Accepted: 09/26/2019] [Indexed: 12/01/2022]
Abstract
Chromium(III) is one of the most controversial biometals. Although, it is no longer on the list of minerals necessary for the proper functioning of the human body, and its pharmacological effect is still under discussion. One of the purposes of Cr(III) administration is to use it in patients with mood disorders and it is strictly related to its pharmacological, not dietary effect. This is because its high doses are necessary to obtain the results and additionally, no deficiencies in human population have been noted. In this study, the affinity of chromium(III) to selected receptors and transporters in the rat brain was evaluated, and the effect of the 14-day administration of this metal was assessed on the density of selected receptors. All analyses were performed in vitro using radioligand binding assays, and the results indicated lack of affinity to β1 and α1 receptors and serotonin transporter (SERT), furthermore very weak affinity to the 5-HT1A receptor (30% inhibition at 10-4 and 10-5 M). Analysis of the α1 and β1 adrenergic receptor density indicated lack of any adaptive effects after 14 days of Cr(III) administration through intraperitoneal injections (doses 6 and 12 mg/kg). The antidepressant activity of chromium(III) indicated in clinical trials concerned patients with atypical, seasonal, or dystonic symptoms. This effect, as it seems based on the presented results, does not depend on direct affinity to serotonin receptors and transporter nor is the result of adaptive changes in the adrenoreceptor system.
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Ostrowska K, Leśniak A, Karczyńska U, Jeleniewicz P, Głuch-Lutwin M, Mordyl B, Siwek A, Trzaskowski B, Sacharczuk M, Bujalska-Zadrożny M. 6-Acetyl-5-hydroxy-4,7-dimethylcoumarin derivatives: Design, synthesis, modeling studies, 5-HT1A, 5-HT2A and D2 receptors affinity. Bioorg Chem 2020; 100:103912. [DOI: 10.1016/j.bioorg.2020.103912] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 04/06/2020] [Accepted: 05/02/2020] [Indexed: 12/23/2022]
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Bucki A, Marcinkowska M, Śniecikowska J, Zagórska A, Jamrozik M, Pawłowski M, Głuch-Lutwin M, Siwek A, Jakubczyk M, Pytka K, Jastrzębska-Więsek M, Partyka A, Wesołowska A, Mierzejewski P, Kołaczkowski M. Multifunctional 6-fluoro-3-[3-(pyrrolidin-1-yl)propyl]-1,2-benzoxazoles targeting behavioral and psychological symptoms of dementia (BPSD). Eur J Med Chem 2020; 191:112149. [PMID: 32105980 DOI: 10.1016/j.ejmech.2020.112149] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 02/12/2020] [Accepted: 02/13/2020] [Indexed: 11/24/2022]
Abstract
Patients suffering from dementia experience cognitive deficits and 90% of them show non-cognitive behavioral and psychological symptoms of dementia (BPSD). The spectrum of BPSD includes agitation, depression, anxiety and psychosis. Antipsychotics, e.g. quetiapine, have been commonly used off-label to control the burdensome symptoms, though they cause serious side effects and further cognitive impairment. Therefore, the development of targeted therapy for BPSD, suitable for elderly patients, remains relevant. A multitarget-directed ligand, acting on serotonin 5-HT2A and dopamine D2 receptors (R) and thus exerting anti-aggressive and antipsychotic activity, as well as on 5-HT6Rs and 5-HT7Rs (potential pro-cognitive, antidepressant and anxiolytic activity), poses a promising strategy for the treatment of BPSD. Antitargeting muscarinic M3R and hERG channel is expected to reduce the risk of side effects. We obtained a series of stereoisomeric compounds by combining 6-fluoro-1,2-benzoxazole moiety and arylsulfonamide fragment through pyrrolidin-1-yl-propyl linker. N-[(3R)-1-[3-(6-fluoro-1,2-benzoxazol-3-yl)propyl]pyrrolidin-3-yl]-1-benzothiophene-2-sulfonamide showed a substantial affinity for the targets of interest (pKi = 8.32-9.35) and no significant interaction with the antitargets. Functional studies revealed its antagonist efficacy (pKB = 7.41-9.03). The lead compound showed a promising profile of antipsychotic-like activity in amphetamine- and MK-801-induced hyperlocomotion (MED = 2.5 mg/kg), antidepressant-like, as well as anxiolytic-like activity in mice (MED = 0.312 and 1.25 mg/kg in the forced swim and four-plate tests, respectively). Notably, the novel compound didn't affect spontaneous locomotor activity, nor induced catalepsy or memory deficits (step-through passive avoidance test) in therapeutically relevant doses, which proved its benign safety profile. The overall pharmacological characteristics of the lead compound outperformed the reference drug quetiapine, making it a promising option for evaluation in the treatment of BPSD.
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Wróbel MZ, Chodkowski A, Marciniak M, Dawidowski M, Maksymiuk A, Siwek A, Nowak G, Turło J. Synthesis of new 4-butyl-arylpiperazine-3-(1H-indol-3-yl)pyrrolidine-2,5-dione derivatives and evaluation for their 5-HT1A and D2 receptor affinity and serotonin transporter inhibition. Bioorg Chem 2020; 97:103662. [DOI: 10.1016/j.bioorg.2020.103662] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 01/10/2020] [Accepted: 02/11/2020] [Indexed: 12/28/2022]
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Piotrowska A, Pilch W, Czerwińska-Ledwig O, Zuziak R, Siwek A, Wolak M, Nowak G. The Possibilities of Using Chromium Salts as an Agent Supporting Treatment of Polycystic Ovary Syndrome. Biol Trace Elem Res 2019; 192:91-97. [PMID: 30715682 PMCID: PMC6820608 DOI: 10.1007/s12011-019-1654-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 01/24/2019] [Indexed: 02/07/2023]
Abstract
The polycystic ovary syndrome (PCOS) is the most frequent endocrinopathy in women in reproductive age with the so far undetermined causes of development. In the etiopathogenesis of PCOS, the role of insulin resistance is emphasised, which was an indication for the attempts at using chromium III salts (Cr) in augmenting pharmacotherapy applied in patients. The analysis of the usefulness and efficacy of this approach was the direct goal of this thesis. Animal tests confirmed the efficacy of chromium in maintaining the appropriate level of glycaemia and insulinaemia, normalisation of plasma concentrations of microelements and also a correlation between the Cr level, insulin and dehydroepiandrosterone (DHEA) was found. A decrease in the expression of 3β-hydroxysteroid dehydrogenase and 17β-hydroxysteroid dehydrogenase was identified in adipose tissue. Clinical studies, although sparse, show that the supplementation with chromium can improve BMI and the parameters evaluating the control of glycaemia and increase the chances for ovulation and regular menstruation. However, the small number and a variability in study protocols makes comparing them very difficult. A completely new subject that has not been yet studied is the possibility of using chromium in levelling mood disorders in patients with PCOS. Currently, there are still no sufficient proofs for introducing chromium as a standard in treating and preventing insulin resistance in patients with PCOS. However, this direction remains open, and treating insulin resistance is an important challenge in clinical practice.
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Malek R, Arribas RL, Palomino-Antolin A, Totoson P, Demougeot C, Kobrlova T, Soukup O, Iriepa I, Moraleda I, Diez-Iriepa D, Godyń J, Panek D, Malawska B, Głuch-Lutwin M, Mordyl B, Siwek A, Chabchoub F, Marco-Contelles J, Kiec-Kononowicz K, Egea J, de los Ríos C, Ismaili L. New Dual Small Molecules for Alzheimer’s Disease Therapy Combining Histamine H3 Receptor (H3R) Antagonism and Calcium Channels Blockade with Additional Cholinesterase Inhibition. J Med Chem 2019; 62:11416-11422. [DOI: 10.1021/acs.jmedchem.9b00937] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Kaproń B, Łuszczki JJ, Siwek A, Karcz T, Nowak G, Zagaja M, Andres-Mach M, Stasiłowicz A, Cielecka-Piontek J, Kocki J, Plech T. Preclinical evaluation of 1,2,4-triazole-based compounds targeting voltage-gated sodium channels (VGSCs) as promising anticonvulsant drug candidates. Bioorg Chem 2019; 94:103355. [PMID: 31662213 DOI: 10.1016/j.bioorg.2019.103355] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 08/24/2019] [Accepted: 10/09/2019] [Indexed: 10/25/2022]
Abstract
Epilepsy is a chronic neurological disorder affecting nearly 65-70 million people worldwide. Despite the observed advances in the development of new antiepileptic drugs (AEDs), still about 30-40% of patients cannot achieve a satisfactory seizure control. In our current research, we aimed at using the combined results of radioligand binding experiments, PAMPA-BBB assay and animal experimentations in order to design a group of compounds that exhibit broad spectrum of anticonvulsant activity. The synthesized 4-alkyl-5-substituted-1,2,4-triazole-3-thione derivatives were primarily screened in the maximal electroshock-induced seizure (MES) test in mice. Next, the most promising compounds (17, 22) were investigated in 6 Hz (32 mA) psychomotor seizure model. Protective effect of compound 22 was almost similar to that of levetiracetam. Moreover, these compounds did not induce genotoxic and hemolytic changes in human cells as well as they were characterized by low cellular toxicity. Taking into account the structural requirements for good anticonvulsant activity of 4-alkyl-5-aryl-1,2,4-triazole-3-thiones, it is visible that small electron-withdrawing substituents attached to phenyl ring have beneficial effects both on affinity towards VGSCs and protective activity in the animal models of epilepsy.
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Czopek A, Bucki A, Kołaczkowski M, Zagórska A, Drop M, Pawłowski M, Siwek A, Głuch-Lutwin M, Pękala E, Chrzanowska A, Struga M, Partyka A, Wesołowska A. Novel multitarget 5-arylidenehydantoins with arylpiperazinealkyl fragment: Pharmacological evaluation and investigation of cytotoxicity and metabolic stability. Bioorg Med Chem 2019; 27:4163-4173. [DOI: 10.1016/j.bmc.2019.07.046] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 07/17/2019] [Accepted: 07/28/2019] [Indexed: 12/21/2022]
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Pańczyk K, Pytka K, Jakubczyk M, Rapacz A, Siwek A, Głuch‐Lutwin M, Gryboś A, Słoczyńska K, Koczurkiewicz P, Ryszawy D, Pękala E, Budziszewska B, Starek‐Świechowicz B, Suraj‐Prażmowska J, Walczak M, Żesławska E, Nitek W, Bucki A, Kołaczkowski M, Żelaszczyk D, Francik R, Marona H, Waszkielewicz AM. Synthesis of
N
‐(phenoxyalkyl)‐,
N
‐{2‐[2‐(phenoxy)ethoxy]ethyl}‐ or
N
‐(phenoxyacetyl)piperazine Derivatives and Their Activity Within the Central Nervous System. ChemistrySelect 2019. [DOI: 10.1002/slct.201902648] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Ślifirski G, Król M, Kleps J, Podsadni P, Belka M, Bączek T, Siwek A, Stachowicz K, Szewczyk B, Nowak G, Bojarski A, Kozioł AE, Turło J, Herold F. Synthesis of new 5,6,7,8-tetrahydropyrido[1,2-c]pyrimidine derivatives with rigidized tryptamine moiety as potential SSRI and 5-HT 1A receptor ligands. Eur J Med Chem 2019; 180:383-397. [PMID: 31325785 DOI: 10.1016/j.ejmech.2019.07.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 07/08/2019] [Accepted: 07/08/2019] [Indexed: 01/16/2023]
Abstract
Extended studies in the 4-aryl-pyrido[1,2-c]pyrimidine group resulted in 27 new compounds (10.1-10.27), 5,6,7,8-tetrahydropyrido[1,2-c]pyrimidine derivatives. In vitro tests (RBA) were carried out for 10.1-10.27 compounds in order to determine their affinity to 5-HT1A receptor and SERT protein. 10.1-10.3, 10.6, 10.7, 10.16 and 10.27 compounds had high binding ability to both molecular targets (5-HT1A Ki = 8-87 nM; SERT Ki = 8-52 nM). For these compounds (10.1-10.3, 10.6, 10.7, 10.16, 10.27) further in vitro, in vivo and metabolic stability tests were performed. In vitro studies in the extended receptor profile (D2, 5-HT2A, 5-HT6 and 5-HT7) showed their selectivity towards 5-HT1A receptor and SERT protein. In vivo tests revealed that compounds 10.7 and 10.16 had the properties of presynaptic antagonists of the 5-HT1A receptor. The redesign of the 2H-pyrido[1,2-c]pyrimidine residue present in the terminal part towards 5,6,7,8-tetrahydropyrido[1,2-c]pyrimidine resulted in the improved metabolic stability and enhanced affinity to both molecular targets (5-HT1A-R and SERT) compared to the precursors.
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Szczepańska K, Karcz T, Siwek A, Kuder KJ, Latacz G, Bednarski M, Szafarz M, Hagenow S, Lubelska A, Olejarz-Maciej A, Sobolewski M, Mika K, Kotańska M, Stark H, Kieć-Kononowicz K. Structural modifications and in vitro pharmacological evaluation of 4-pyridyl-piperazine derivatives as an active and selective histamine H 3 receptor ligands. Bioorg Chem 2019; 91:103071. [PMID: 31362197 DOI: 10.1016/j.bioorg.2019.103071] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 06/12/2019] [Accepted: 06/14/2019] [Indexed: 12/11/2022]
Abstract
A novel series of 4-pyridylpiperazine derivatives with varying alkyl linker length and eastern part substituents proved to be potent histamine H3 receptor (hH3R) ligands in the nanomolar concentration range. While paying attention to their alkyl linker length, derivatives with a six methylene linker tend to be more potent than their five methylene homologues. Moreover, in the case of both phenoxyacetyl- and phenoxypropionyl- derivatives, an eight methylene linkers possess lower activity than their seven methylene homologues. However, in global analysis of collected data on the influence of alkyl linker length, a three methylene homologues appeared to be of highest hH3R affinity among all described 4-pyridylpiperazine derivatives from our group up to date. In the case of biphenyl and benzophenone derivatives, compounds with para- substituted second aromatic ring were of higher affinity than their meta analogues. Interestingly, benzophenone derivative 18 showed the highest affinity among all tested compounds (hH3R Ki = 3.12 nM). The likely protein-ligand interactions, responsible for their high affinity were demonstrated using molecular modeling techniques. Furthermore, selectivity, intrinsic activity at H3R, as well as drug-like properties of selected ligands were evaluated using in vitro methods.
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Ali W, Więcek M, Łażewska D, Kurczab R, Jastrzębska-Więsek M, Satała G, Kucwaj-Brysz K, Lubelska A, Głuch-Lutwin M, Mordyl B, Siwek A, Nasim MJ, Partyka A, Sudoł S, Latacz G, Wesołowska A, Kieć-Kononowicz K, Handzlik J. Synthesis and computer-aided SAR studies for derivatives of phenoxyalkyl-1,3,5-triazine as the new potent ligands for serotonin receptors 5-HT 6. Eur J Med Chem 2019; 178:740-751. [PMID: 31229876 DOI: 10.1016/j.ejmech.2019.06.022] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 05/31/2019] [Accepted: 06/07/2019] [Indexed: 11/19/2022]
Abstract
This research has provided the most active 5-HT6R agents among 1,3,5-triazine derivatives investigated to date and has also identified the world's first selenium-containing 5-HT6R ligands. The studies are focused on design, synthesis, biological evaluation and docking-supported SAR analysis for novel 5-HT6R agents as derivatives of lead structure 4-(4-methylpiperazin-1-yl)-6-(phenoxymethyl)-1,3,5-triazin-2-amine (7). The lead modifications included an introduction of: (i) various small substituents at benzene ring, (ii) a branched ether linker or (iii) the ether oxygen replacement with other chalcogen (S, Se) or sulfonyl moiety. Hence, a series of new compounds (7-24) was synthesized and examined on their affinities for 5-HT6R and selectivity, in respect to the 5-HT1AR, 5-HT2AR, 5-HT7R and dopamine D2 receptor, in the radioligand binding assays. For representative most active compounds functional bioassays and toxicity profile in vitro and antidepressant-like activity in vivo were examined. The 2-isopropyl-5-methylphenyl derivative (10) was found as the most active triazine 5-HT6R antagonist (Ki = 11 nM). SAR analysis indicated, that an exchange of oxygen to selenium (7 vs. 22), and especially, to sulfur (7 vs. 19) was beneficial to increase both affinity and antagonistic action for 5-HT6R. Surprisingly, an introduction of SO2 caused a drastic decrease of the 5-HT6R affinity, which was explained at a molecular level based on docking studies. All in vivo tested compounds (10, 18 and 21) did not show any risk of toxicity in the safety studies in vitro.
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Marcinkowska M, Bucki A, Panek D, Siwek A, Fajkis N, Bednarski M, Zygmunt M, Godyń J, Del Rio Valdivieso A, Kotańska M, Kołaczkowski M, Więckowska A. Anti-Alzheimer's multitarget-directed ligands with serotonin 5-HT 6 antagonist, butyrylcholinesterase inhibitory, and antioxidant activity. Arch Pharm (Weinheim) 2019; 352:e1900041. [PMID: 31162703 DOI: 10.1002/ardp.201900041] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Revised: 04/04/2019] [Accepted: 04/07/2019] [Indexed: 11/12/2022]
Abstract
Serotonin 5-HT6 receptors, butyrylcholinesterase (BuChE) and oxidative stress are related to the pathophysiology of Alzheimer's disease. Inhibition of BuChE provides symptomatic treatment of the disease and the same effect was demonstrated for 5-HT 6 antagonists in clinical trials. Oxidative stress is regarded as a major and primary factor contributing to the development of Alzheimer's disease; therefore, antioxidant agents may provide a disease-modifying effect. Combining BuChE inhibition, 5-HT 6 antagonism, and antioxidant properties may result in multitarget-directed ligands providing cognition-enhancing properties with neuroprotective activity. On the basis of the screening of the library of 5-HT 6 antagonists against BuChE, we selected two compounds and designed their structural modifications that could lead to improved BuChE inhibitory activity. We synthesized two series of compounds and tested their affinity and functional activity at 5-HT 6 receptors, BuChE inhibitory activity and antioxidant properties. Compound 12 with K i and K b values against 5-HT 6 receptors of 41.8 and 74 nM, respectively, an IC 50 value of 5 µM against BuChE and antioxidant properties exceeding the activity of ascorbic acid is a promising lead structure for further development of anti-Alzheimer's agents.
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Janeczko A, Pociecha E, Dziurka M, Jurczyk B, Libik-Konieczny M, Oklestkova J, Novák O, Pilarska M, Filek M, Rudolphi-Skórska E, Sadura I, Siwek A. Changes in content of steroid regulators during cold hardening of winter wheat - Steroid physiological/biochemical activity and impact on frost tolerance. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2019; 139:215-228. [PMID: 30908973 DOI: 10.1016/j.plaphy.2019.03.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 03/09/2019] [Accepted: 03/11/2019] [Indexed: 05/24/2023]
Abstract
The purpose of experiments was to describe the alterations of content of steroid regulators (brassinosteroids, progesterone) during cold hardening of winter wheat. Further we studied physiological and biochemical changes induced by these steroids in cold hardened winter wheat together with estimation of plant frost tolerance. The endogenous brassinosteroid content was elevated in winter wheat during cold hardening while level of progesterone was lowered. A higher content of brassinosteroids (but not progesterone) was connected to better frost tolerance of winter wheat cultivars. Plant supplementation with brassinosteroid (24-epibrassinolide) and progesterone before cold hardening reduced frost damage. Tests with the inhibitors of the biosynthesis of brassinosteroids and progesterone suggested that these steroids are one of players in regulating the antioxidant system in winter wheat during cold hardening. Their role in regulating the expression of Rubisco or the Rubisco activase gene was less clear. Steroid regulators did not affect the content of the stress hormone ABA. Model studies of the membranes, made on a Langmuir bath, showed an increase in the value of the parameter describing differences in membrane compressibility (resulting from stronger interactions among the molecules in the monolayers). This suggests that 24-epibrassinolide and progesterone enter into the lipid layer and - in a similar way to sterols - stabilise the interaction among lipids. It may be significant step for better frost tolerance. The use of steroid regulators (especially brassinosteroids) as agrochemicals improving frost tolerance of winter cereals will be discussed.
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Sniecikowska J, Gluch-Lutwin M, Bucki A, Więckowska A, Siwek A, Jastrzebska-Wiesek M, Partyka A, Wilczyńska D, Pytka K, Pociecha K, Cios A, Wyska E, Wesołowska A, Pawłowski M, Varney MA, Newman-Tancredi A, Kolaczkowski M. Novel Aryloxyethyl Derivatives of 1-(1-Benzoylpiperidin-4-yl)methanamine as the Extracellular Regulated Kinases 1/2 (ERK1/2) Phosphorylation-Preferring Serotonin 5-HT 1A Receptor-Biased Agonists with Robust Antidepressant-like Activity. J Med Chem 2019; 62:2750-2771. [PMID: 30721053 DOI: 10.1021/acs.jmedchem.9b00062] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Novel 1-(1-benzoylpiperidin-4-yl)methanamine derivatives were designed as "biased agonists" of serotonin 5-HT1A receptors. The compounds were tested in signal transduction assays (ERK1/2 phosphorylation, cAMP inhibition, Ca2+ mobilization, and β-arrestin recruitment) which identified ERK1/2 phosphorylation-preferring aryloxyethyl derivatives. The novel series showed high 5-HT1A receptor affinity, >1000-fold selectivity versus noradrenergic α1, dopamine D2, serotonin 5-HT2A, histamine H1, and muscarinic M1 receptors, and favorable druglike properties (CNS-MPO, Fsp3, LELP). The lead structure, (3-chloro-4-fluorophenyl)(4-fluoro-4-(((2-(pyridin-2-yloxy)ethyl)amino)methyl)piperidin-1-yl)methanone (17, NLX-204), displayed high selectivity in the SafetyScreen44 panel (including hERG channel), high solubility, metabolic stability, and Caco-2 penetration and did not block CYP3A4, CYP2D6 isoenzymes, or P-glycoprotein. Preliminary in vivo studies confirmed its promising pharmacokinetic profile. 17 also robustly stimulated ERK1/2 phosphorylation in rat cortex and showed highly potent (MED = 0.16 mg/kg) and efficacious antidepressant-like activity, totally eliminating immobility in the rat Porsolt test. These data suggest that the present 5-HT1A receptor-biased agonists could constitute promising antidepressant drug candidates.
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Ślifirski G, Król M, Kleps J, Ulenberg S, Belka M, Bączek T, Siwek A, Stachowicz K, Szewczyk B, Nowak G, Bojarski A, Kozioł AE, Turło J, Herold F. Synthesis of novel pyrido[1,2-c]pyrimidine derivatives with rigidized tryptamine moiety as potential SSRI and 5-HT 1A receptor ligands. Eur J Med Chem 2019; 166:144-158. [PMID: 30703658 DOI: 10.1016/j.ejmech.2019.01.031] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 01/11/2019] [Accepted: 01/13/2019] [Indexed: 12/29/2022]
Abstract
The study enabled obtaining a number of new derivatives of 4-aryl-pyrido[1,2-c]pyrimidine 9.1-9.27 having conformationally restricted tryptamine moiety. In vitro studies (RBA) have shown that derivatives 9.1, 9.2, 9.4, 9.7, 9.9, 9.14 and 9.27 exhibit high affinity to molecular targets 5-HT1A receptor and SERT protein. In general, compounds with an unsubstituted or a para-substituted benzene ring of the pyrido[1,2-c]pyrimidine residue in the terminal part were characterized by higher binding ability, which can be justified by the greater flexibility of the structure. For the selected compounds 9.1, 9.7, 9.9 and 9.27, further in vitro, in vivo and metabolic stability tests were performed. The in vitro studies in the extended receptor profile (D2, 5-HT2A, 5-HT6 and 5-HT7) indicated their selectivity toward the 5-HT1A receptor and SERT protein. The in vivo studies (8-OH-DPAT-induced hypothermia in mice, FST) revealed that the compound 9.1 has the properties of presynaptic agonist of the 5-HT1A receptor, and compound 9.7 demonstrated the properties of a presynaptic antagonist of the 5-HT1A receptor. Metabolic stability studies, in turn, showed that compounds 9.1, 9.7 and 9.9, having an unsubstituted indole residue, were more resistant to biotransformation reactions of the first pass phase than was compound 9.27 containing a 5-methoxy-substituted indole residue. The obtained results allowed further optimization of the structure.
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