- Discovery of a 3,4,5-trisubstituted-1,2,4-triazole agonist with high affinity and selectivity at the somatostatin subtype-4 (sst4) receptor
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A series of compounds containing a 1,2,4-triazole moiety were synthesized, targeting the somatostatin receptor subtype-4 (sst4). Compounds were developed in which the Phe6/Phe7/Phe11, Trp8, and Lys9 mimetic groups were interchanged at positions 3, 4, and 5 of the 1,2,4-triazole ring. The 1,2,4-triazoles containing an 2-(imidazol-4-yl)ethyl substituent at position-3 demonstrated moderate binding affinity at sst4. 1,2,4-Triazoles containing an (indol-3-yl)methyl substituent at position-5 lacked affinity at sst4. The 1,2,4-triazoles containing an aminopropyl group at position-4 showed enhanced binding affinity compared to the 3-position. One compound with an 3-(imidazol-4-yl)propyl group at position-4 (compound 44) imparted high affinity and selectivity at sst4 (sst2A = >10000 nM; sst4 = 19 nM), acting as an agonist (EC50 = 6.8 nM). Docking 44 into a model-built structure of sst4 pointed to differences in its binding versus the other low-affinity compounds and was also in line with one of the two previously reported binding modes. A virtual screening (VS) experiment, employing two separate docking algorithms, was able to score 44 among the top-ranked poses. In summary, compound 44 represents a novel and promising lead structure towards the development of a clinically viable sst4 agonist for the treatment of conditions ranging from Alzheimer's disease to chronic pain.
- Daryaei, Iman,Sandoval, Karin,Witt, Ken,Kontoyianni, Maria,Michael Crider
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- Synthesis, Enzyme Inhibition, and Molecular Docking Studies of Hydrazones from Dichlorophenylacetic Acids
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A series of hydrazones 5a–i were synthesized by the condensation of hydrazides derived from dichlorophenylacetic acids with different aromatic aldehydes and ketones. Their structures were confirmed by spectroscopic data and elemental analysis. Hydrazones
- Abid, Obaid-Ur-Rahman,Ayaz, Muhammad,Rehman, Wajid,Mehdi, Kamran,Ali, Arif,Wadood, Abdul,Rahim, Fazal,Sultan, Aneesa,Ghufran, Mehreen,Mir, Sadullah,Qureshi, Muhammad Tauseef
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- Synthesis and structure-activity relationships of 3,4,5-trisubstituted-1,2,4-triazoles: High affinity and selective somatostatin receptor-4 agonists for Alzheimer's disease treatment
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Somatostatin receptor-4 (SST4) is highly expressed in brain regions affiliated with learning and memory. SST4 agonist treatment may act to mitigate Alzheimer's disease (AD) pathology. An integrated approach to SST4 agonist lead optimization is presented herein. High affinity and selective agonists with biological efficacy were identified through iterative cycles of a structure-based design strategy encompassing computational methods, chemistry, and preclinical pharmacology. 1,2,4-Triazole derivatives of our previously reported hit (4) showed enhanced SST4 binding affinity, activity, and selectivity. Thirty-five compounds showed low nanomolar range SST4 binding affinity, 12 having a Ki 500-fold affinity for SST4 as compared to SST2A. SST4 activities were consistent with the respective SST4 binding affinities (EC50 600-fold selectivity over SST2A) display a favorable physiochemical profile, and was advanced to learning and memory behavior evaluations in the senescence accelerated mouse-prone 8 model of AD-related cognitive decline. Chronic administration enhanced learning with i.p. dosing (1 mg kg-1) compared to vehicle. Chronic administration enhanced memory with both i.p. (0.01, 0.1, 1 mg kg-1) and oral (0.01, 10 mg kg-1) dosing compared to vehicle. This study identified a novel series of SST4 agonists with high affinity, selectivity, and biological activity that may be useful in the treatment of AD. This journal is
- Crider, A. Michael,Farr, Susan A.,Frare, Rafael,Hospital, Audrey,Kontoyianni, Maria,Kukielski, Stephen G.,Minaeian, Mahsa,Mobayen, Shirin,Neumann, William L.,Niehoff, Michael L.,Sandoval, Karin E.,Slater, Olivia,Srabony, Khush N.,Witt, Ken A.
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p. 1352 - 1365
(2021/11/09)
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- 3,4,5-TRISUBSTITUTED-1,2,4-TRIAZOLES AND 3,4,5-TRISUBSTITUTED-3-THIO-1,2,4-TRIAZOLES AND USES THEREOF
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The present disclosure describes novel compounds that are somatostatin receptor type 4 agonists.
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Paragraph 0158; 0193; 0205
(2018/12/02)
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- Synthesis & characterization of 2-(substituted-phenyl)acetohydrazide analogs, 1,3,4-oxadiazoles, and 1,2,4-triazine Ring Systems: A novel class of potential analgesic and anti-inflammatory agents
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The new series of 2-(substituted-phenyl)acetohydrazides analogs, S-alkylated 5-substituted-1,3,4-oxadiazoles-2-thione derivatives and 5-arylidene-3-substituted-1,2,4-triazines have been synthesized in good yields and characterized by IR, NMR, mass spectral and elemental analyses. All the synthesized compounds 4(a-d), 5(a-d), 7(a-b), and 8(a-f) are evaluated for their in vitro DPPH scavenging, antimicrobial activity, in vivo analgesic, anti-inflammatory activities. The results of the anti-inflammatory activity are supported by molecular docking study with mouse COX-1 (PDB ID: 2CZT) and COX-2 (PDB ID: 3LN1) enzymes to predict their putative interactions. Among all the assays conducted, the compounds 5-(4-bromophenyl)-3-(naphthalen-2-ylmethyl)-1,2,4-triazine (4d) and2-{[5-(diphenylmethyl)-1,3,4-oxadiazol-2-yl]sulfanyl}-N-(pyrazin-2-yl)acetamide (8a) have emerged as the most potent molecules.
- Nayak, Prakash S.,Narayana, Badiadka,Fernandes, Jennifer,Sarojini, Balladka K.,Sheik, Sana,Shashidhara, Kenkere S.,Chandrashekhar, Konambi R.,Byrappa, Kullaiah
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p. 547 - 562
(2016/10/12)
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- Isatin based Schiff bases as inhibitors of α-glucosidase: Synthesis, characterization, in vitro evaluation and molecular docking studies
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Isatin base Schiff bases (1-20) were synthesized, characterized by 1H NMR and EI/MS and evaluated for α-glucosidase inhibitory potential. Out of these twenty (20) compounds only six analogs showed potent α-glucosidase inhibitory potential with IC50 value ranging in between 2.2 ± 0.25 and 83.5 ± 1.0 μM when compared with the standard acarbose (IC50 = 840 ± 1.73 μM). Among the series compound 2 having IC50 value (18.3 ± 0.56 μM), 9 (83.5 ± 1.0 μM), 11 (3.3 ± 0.25 μM), 12 (2.2 ± 0.25 μM), 14 (11.8 ± 0.15 μM), and 20 (3.0 ± 0.15 μM) showed excellent inhibitory potential many fold better than the standard acarbose. The binding interactions of these active analogs were confirmed through molecular docking.
- Rahim, Fazal,Malik, Fazal,Ullah, Hayat,Wadood, Abdul,Khan, Fahad,Javid, Muhammad Tariq,Taha, Muhammad,Rehman, Wajid,Ur Rehman, Ashfaq,Khan, Khalid Mohammed
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- INHIBITORS OF VOLTAGE-GATED SODIUM CHANNELS
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Compounds, compositions and methods are provided which are useful in the treatment of diseases through the inhibition of sodium ion flux through voltage-gated sodium channels. More particularly, the invention provides heterocyclic aryl sulfonamides, compo
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Page/Page column 41
(2008/06/13)
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- Synthesis and SAR evaluation of 1,2,4-triazoles as A2A receptor antagonists
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The synthesis and in vitro structure-activity relationships (SAR) of a series of triazoles as A2A receptor antagonists is reported. This resulted in the identification of potent, selective and permeable 1,2,4-triazoles such as 42 for further op
- Alanine, Alexander,Anselm, Lilli,Steward, Lucinda,Thomi, Stefan,Vifian, Walter,Groaning, Michael D.
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p. 817 - 821
(2007/10/03)
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