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1.
Cancers (Basel) ; 16(11)2024 May 27.
Article in English | MEDLINE | ID: mdl-38893153

ABSTRACT

Numerous studies have reported that Dyrk1A, Dyrk1B, and Clk1 are overexpressed in multiple cancers, suggesting a role in malignant disease. Here, we introduce a novel class of group-selective kinase inhibitors targeting Dyrk1A, Dyrk1B, and Clk1. This was achieved by modifying our earlier selective Clk1 inhibitors, which were based on the 5-methoxybenzothiophene-2-carboxamide scaffold. By incorporating a 5-hydroxy group, we increased the potential for additional hydrogen bond interactions that broadened the inhibitory effect to include Dyrk1A and Dyrk1B kinases. Within this series, compounds 12 and 17 emerged as the most potent multi-kinase inhibitors against Dyrk1A, Dyrk1B, and Clk1. Furthermore, when assessed against the most closely related kinases also implicated in cancer, the frontrunner compounds revealed additional inhibitory activity against Haspin and Clk2. Compounds 12 and 17 displayed high potency across various cancer cell lines with minimal effect on non-tumor cells. By examining the effect of these inhibitors on cell cycle distribution, compound 17 retained cells in the G2/M phase and induced apoptosis. Compounds 12 and 17 could also increase levels of cleaved caspase-3 and Bax, while decreasing the expression of the antiapoptotic Bcl-2 protein. These findings support the further study and development of these compounds as novel anticancer therapeutics.

2.
Eur J Med Chem ; 269: 116266, 2024 Apr 05.
Article in English | MEDLINE | ID: mdl-38490063

ABSTRACT

In neurodegenerative diseases, using a single molecule that can exert multiple effects to modify the disease may have superior activity over the classical "one molecule-one target" approach. Herein, we describe the discovery of 6-hydroxybenzothiazol-2-carboxamides as highly potent and selective MAO-B inhibitors. Variation of the amide substituent led to several potent compounds having diverse side chains with cyclohexylamide 40 displaying the highest potency towards MAO-B (IC50 = 11 nM). To discover new compounds with extended efficacy against neurotoxic mechanisms in neurodegenerative diseases, MAO-B inhibitors were screened against PHF6, R3 tau, cellular tau and α-synuclein (α-syn) aggregation. We identified the phenethylamide 30 as a multipotent inhibitor of MAO-B (IC50 = 41 nM) and α-syn and tau aggregation. It showed no cytotoxic effects on SH-SY5Y neuroblastoma cells, while also providing neuroprotection against toxicities induced by α-syn and tau. The evaluation of key physicochemical and in vitro-ADME properties revealed a great potential as drug-like small molecules with multitarget neuroprotective activity.


Subject(s)
Neuroblastoma , Neurodegenerative Diseases , Humans , Monoamine Oxidase Inhibitors/pharmacology , Monoamine Oxidase Inhibitors/chemistry , Neuroprotection , Monoamine Oxidase/metabolism , Structure-Activity Relationship
3.
Pharmaceuticals (Basel) ; 15(7)2022 Jun 22.
Article in English | MEDLINE | ID: mdl-35890077

ABSTRACT

For many inflammatory diseases, new effective drugs with fewer side effects are needed. While it appears promising to target the activation of the central pro-inflammatory transcription factor NF-κB, many previously discovered agents suffered from cytotoxicity. In this study, new alkylthiourea quinazoline derivatives were developed that selectively inhibit the activation of NF-κB in macrophage-like THP-1 cells while showing low general cytotoxicity. One of the best compounds, 19, strongly inhibited the production of IL-6 (IC50 = 0.84 µM) and, less potently, of TNFα (IC50 = 4.0 µM); in comparison, the reference compound, caffeic acid phenethyl ester (CAPE), showed IC50s of 1.1 and 11.4 µM, respectively. Interestingly, 19 was found to block the translocation of the NF-κB dimer to the nucleus, although its release from the IκB complex was unaffected. Furthermore, 19 suppressed the phosphorylation of NF-κB-p65 at Ser468 but not at Ser536; however, 19 did not inhibit any kinase involved in NF-κB activation. The only partial suppression of p65 phosphorylation might be associated with fewer side effects. Since several compounds selectively induced cell death in activated macrophage-like THP-1 cells, they might be particularly effective in various inflammatory diseases that are exacerbated by excess activated macrophages, such as arteriosclerosis and autoimmune diseases.

4.
Bioorg Chem ; 127: 105977, 2022 10.
Article in English | MEDLINE | ID: mdl-35779404

ABSTRACT

The transcription factor NF-κB is a pivotal mediator of chronic inflammatory and autoimmune diseases. Based on our previously published dual EGFR/NF-κB inhibitors, we designed and synthesized new thiourea quinazoline derivatives that retained only the NF-κB inhibitory activity. Several congeners displayed a strong suppression of NF-κB activity in a reporter gene assay, yet low cytotoxicity, and were further evaluated in differentiated macrophage-like THP-1 cells. The compounds exhibited a strong inhibition of IL-6 and, less potently, of TNFα release, which was accompanied by a selective induction of macrophage cell death. The mode of action was investigated with a selected inhibitor, 18, revealing that the translocation of p65/RelA to the nucleus but not its release from the IκB complex was inhibited. Eventually, 18 was identified as the first small molecule inhibitor affecting only the phosphorylation of p65-Ser468 but not of Ser536, which may be causally related to the retention of NF-κB in the cytoplasm. Altogether, our novel NF-κB inhibitors seem applicable for the suppression of cytokine release and the additional selective depletion of activated macrophages in various inflammatory diseases.


Subject(s)
NF-kappa B , Phenylthiourea , Anti-Inflammatory Agents/pharmacology , ErbB Receptors/metabolism , Lipopolysaccharides , NF-kappa B/metabolism , Phosphorylation
5.
Cancers (Basel) ; 12(4)2020 Mar 29.
Article in English | MEDLINE | ID: mdl-32235364

ABSTRACT

For the past two decades, cellular senescence has been recognized as a central component of the tumor cell response to chemotherapy and radiation. Traditionally, this form of senescence, termed Therapy-Induced Senescence (TIS), was linked to extensive nuclear damage precipitated by classical genotoxic chemotherapy. However, a number of other forms of therapy have also been shown to induce senescence in tumor cells independently of direct genomic damage. This review attempts to provide a comprehensive summary of both conventional and targeted anticancer therapeutics that have been shown to induce senescence in vitro and in vivo. Still, the utility of promoting senescence as a therapeutic endpoint remains under debate. Since senescence represents a durable form of growth arrest, it might be argued that senescence is a desirable outcome of cancer therapy. However, accumulating evidence suggesting that cells have the capacity to escape from TIS would support an alternative conclusion, that senescence provides an avenue whereby tumor cells can evade the potentially lethal action of anticancer drugs, allowing the cells to enter a temporary state of dormancy that eventually facilitates disease recurrence, often in a more aggressive state. Furthermore, TIS is now strongly connected to tumor cell remodeling, potentially to tumor dormancy, acquiring more ominous malignant phenotypes and accounts for several untoward adverse effects of cancer therapy. Here, we argue that senescence represents a barrier to effective anticancer treatment, and discuss the emerging efforts to identify and exploit agents with senolytic properties as a strategy for elimination of the persistent residual surviving tumor cell population, with the goal of mitigating the tumor-promoting influence of the senescent cells and to thereby reduce the likelihood of cancer relapse.

6.
Perspect Psychiatr Care ; 56(1): 46-53, 2020 Jan.
Article in English | MEDLINE | ID: mdl-30887537

ABSTRACT

PURPOSE: The study aimed to assess the correlation between fatigue and psychological factors, namely stress, social support, self-esteem, and depression among pregnant women in Jordan. DESIGN AND METHODS: A cross-sectional design was suggested. Cluster stratified random sampling technique was adopted. Fatigue assessment scale, Rosenberg Self-Esteem Scale, Perceived Stress Scale, Multidimensional Social Support Scale, and Beck's Depression Inventory were used. FINDINGS: A total of 580 pregnant women were included. Overall, 67.4% of the participants experienced fatigue, about 74.0% had moderate to high stress, 56.0% had moderate social support, around 89.0% had normal self-esteem, and 43.1% experienced moderate to extreme depression. Stress, self-esteem, and depression were correlated with fatigue. PRACTICE IMPLICATIONS: This study can help develop proper psychosocial care and sustain mental health among women during pregnancy.


Subject(s)
Fatigue/epidemiology , Fatigue/psychology , Pregnancy Complications/epidemiology , Pregnancy Complications/psychology , Adolescent , Adult , Cross-Sectional Studies , Depression/diagnosis , Female , Humans , Jordan/epidemiology , Linear Models , Middle Aged , Pregnancy , Psychiatric Status Rating Scales , Self Concept , Social Support , Stress, Psychological , Young Adult
7.
Eur J Med Chem ; 158: 270-285, 2018 Oct 05.
Article in English | MEDLINE | ID: mdl-30223116

ABSTRACT

Dual-specificity tyrosine phosphorylation-regulated kinase 1A (Dyrk1A) is a potential target in Alzheimer's disease (AD) because of the established correlation between its over-expression and generation of neurofibrillary tangles (NFT) as well as the accumulation of amyloid plaques. However, the use of Dyrk1A inhibitors requires a high degree of selectivity over closely related kinases. In addition, the physicochemical properties of the Dyrk1A inhibitors need to be controlled to enable CNS permeability. In the present study, we optimized our previously published 2,4-bispyridyl thiophene class of Dyrk1A inhibitors by the synthesis of a small library of amide derivatives, carrying alkyl, cycloalkyl, as well as acidic and basic residues. Among this library, the cyclopropylamido modification (compound 4b) was identified as being highly beneficial for several crucial properties. 4b displayed high potency and selectivity against Dyrk1A over closely related kinases in cell-free assays (IC50: Dyrk1A = 3.2 nM; Dyrk1B = 72.9 nM and Clk1 = 270 nM) and inhibited the Dyrk1A activity in HeLa cells with high efficacy (IC50: 43 nM), while no significant cytotoxicity was observed. In addition, the cyclopropylamido group conferred high metabolic stability and maintained the calculated physicochemical properties in a range compatible with a potential CNS activity. Thus, based on its favourable properties, 4b can be considered as a candidate for further in vivo testing in animal models of AD.


Subject(s)
Protein Kinase Inhibitors/chemistry , Protein Kinase Inhibitors/pharmacology , Protein Serine-Threonine Kinases/antagonists & inhibitors , Protein-Tyrosine Kinases/antagonists & inhibitors , Thiophenes/chemistry , Thiophenes/pharmacology , Amides/chemistry , Amides/metabolism , Amides/pharmacology , Drug Design , HeLa Cells , Humans , Liver/metabolism , Molecular Docking Simulation , Protein Kinase Inhibitors/metabolism , Protein Serine-Threonine Kinases/metabolism , Protein-Tyrosine Kinases/metabolism , Thiophenes/metabolism , Dyrk Kinases
8.
Eur J Med Chem ; 157: 1031-1050, 2018 Sep 05.
Article in English | MEDLINE | ID: mdl-30193214

ABSTRACT

The protein kinase Dyrk1A modulates several processes relevant to the development or progression of Alzheimer's disease (AD), e. g. through phosphorylation of tau protein, amyloid precursor protein (APP) as well as proteins involved in the regulation of alternative splicing of tau pre-mRNA. Therefore, Dyrk1A has been proposed as a potential target for the treatment of AD. However, the co-inhibition of other closely related kinases of the same family of protein kinases (e.g. Dyrk1B and Dyrk2) or kinases from other families such as Clk1 limits the use of Dyrk1A inhibitors, as this may cause unpredictable side effects especially over long treatment periods. Herein, we describe the design and synthesis of a series of amide functionalized 2,4-bispyridyl thiophene compounds, of which the 4-fluorobenzyl amide derivative (31b) displayed the highest potency against Dyrk1A and remarkable selectivity over closely related kinases (IC50: Dyrk1A = 14.3 nM; Dyrk1B = 383 nM, Clk1 > 2 µM). This degree of selectivity over the frequently hit off-targets has rarely been achieved to date. Additionally, 31b inhibited Dyrk1A in intact cells with high efficacy (IC50 = 79 nM). Furthermore, 31b displayed a high metabolic stability in vitro with a half-life of 2 h. Altogether, the benzamide and benzylamide extension at the 2,4-bispyridyl thiophene core improved several key properties, giving access to compound suitable for future in vivo studies.


Subject(s)
Amides/pharmacology , Benzamides/pharmacology , Protein Kinase Inhibitors/pharmacology , Protein Serine-Threonine Kinases/antagonists & inhibitors , Protein-Tyrosine Kinases/antagonists & inhibitors , Thiophenes/pharmacology , Amides/chemical synthesis , Amides/chemistry , Benzamides/chemical synthesis , Benzamides/chemistry , Dose-Response Relationship, Drug , Humans , Molecular Structure , Protein Kinase Inhibitors/chemical synthesis , Protein Kinase Inhibitors/chemistry , Structure-Activity Relationship , Thiophenes/chemical synthesis , Thiophenes/chemistry , Dyrk Kinases
9.
J Med Chem ; 60(7): 2853-2868, 2017 04 13.
Article in English | MEDLINE | ID: mdl-28291344

ABSTRACT

The activation of the NF-κB transcription factor is a major adaptive response induced upon treatment with EGFR kinase inhibitors, leading to the emergence of resistance in nonsmall cell lung cancer and other tumor types. To suppress this survival mechanism, we developed new thiourea quinazoline derivatives that are dual inhibitors of both EGFR kinase and the NF-κB activity. Optimization of the hit compound, identified in a NF-κB reporter gene assay, led to compound 9b, exhibiting a cellular IC50 for NF-κB inhibition of 0.3 µM while retaining a potent EGFR kinase inhibition (IC50 = 60 nM). The dual inhibitors showed a higher potency than gefitinib to inhibit cell growth of EGFR-overexpressing tumor cell lines in vitro and in a xenograft model in vivo, while no signs of toxicity were observed. An investigation of the molecular mechanism of NF-κB suppression revealed that the dual inhibitors depleted the transcriptional coactivator CREB-binding protein from the NF-κB complex in the nucleus.


Subject(s)
Antineoplastic Agents/chemistry , Antineoplastic Agents/therapeutic use , Breast Neoplasms/drug therapy , ErbB Receptors/antagonists & inhibitors , NF-kappa B/antagonists & inhibitors , Quinazolines/chemistry , Quinazolines/therapeutic use , Animals , Antineoplastic Agents/pharmacokinetics , Antineoplastic Agents/pharmacology , Breast/drug effects , Breast/metabolism , Breast/pathology , Breast Neoplasms/metabolism , Breast Neoplasms/pathology , Cell Line, Tumor , ErbB Receptors/metabolism , Female , Human Umbilical Vein Endothelial Cells , Humans , Mice , Mice, Nude , NF-kappa B/metabolism , Neoplasms/drug therapy , Neoplasms/metabolism , Neoplasms/pathology , Quinazolines/pharmacokinetics , Quinazolines/pharmacology , Signal Transduction/drug effects , Thiourea/analogs & derivatives , Thiourea/pharmacokinetics , Thiourea/pharmacology , Thiourea/therapeutic use
10.
Eur J Pharm Sci ; 93: 405-9, 2016 Oct 10.
Article in English | MEDLINE | ID: mdl-27516147

ABSTRACT

The protein kinase PKCζ is involved in the fine regulation of the NF-κB transcriptional activity and, therefore, represents a potential pharmacological target in inflammatory diseases. We previously developed a selective, allosteric inhibitor (MA130) of PKCζ. Now, we investigated which of the NF-κB-regulated gene expressions are suppressed by MA130 after TNFα-stimulation of the macrophage model cell line U937. The analysis of gene expressions using a qPCR array revealed that many cytokines contributing to the pathogenesis and systemic inflammation in chronic obstructive pulmonary disease (COPD), including CCL2, CCL20, CSF2, CXCL1, CXCL10, IL1B and TNFα, were down-regulated by MA130 but not by a PKCζ-inactive control compound. Thus, we provided the first evidence that PKCζ is a potential target for the treatment of COPD by selective small molecules. MA130 inhibited only a subset of NF-κB-dependent gene expressions, suggesting that targeting PKCζ will be more tolerable than total inhibition of NF-κB activation.


Subject(s)
Cytokines/genetics , Gene Expression Regulation/drug effects , Protein Kinase C/antagonists & inhibitors , Protein Kinase Inhibitors/pharmacology , Pulmonary Disease, Chronic Obstructive/metabolism , Pyrazoles/pharmacology , Animals , Cytokines/metabolism , Down-Regulation , Humans , Mice , NF-kappa B/genetics , Protein Kinase C/metabolism , RAW 264.7 Cells , U937 Cells
11.
Indian J Endocrinol Metab ; 18(2): 202-9, 2014 Mar.
Article in English | MEDLINE | ID: mdl-24741517

ABSTRACT

AIM: This study aims to determine the potential impact of positive family history of Metabolic Syndrome (MetS) among two generations, on developing Type 2 Diabetes Mellitus (T2DM) and the potential relation of consanguineous marriage among patients with MetS to the risk of developing T2DM among a sample of Qataris. DESIGN: A cross-sectional study. SETTING: Primary healthcare (PHC) centers. MATERIALS AND METHODS: The survey and measurement were conducted from April 2011 to December 2012 among Qatari nationals above 20 years of age. Of the 2,182 subjects, who were approached to participate in the study, 1,552 (71%) gave their consent. Face-to-face interviews were conducted using a structured questionnaire followed by anthropometric measurements and laboratory tests. Metabolic syndrome was defined using the National Cholesterol Education Program-Third Adult Treatment Panel (ATP III) as well as International Diabetes Federation (IDF). RESULTS: Overall, the prevalence of MetS was 26.2% according to ATP III and 36.9% according to IDF (P < 0.0001). The mean age of MetS patients with T2DM was significantly higher than those without T2DM (Mean 48 ± 9.9 vs. 42.5 ± 9.2; P < 0.001). The proportion of females was higher among MetS patients with T2DM as compared to those without T2DM (61% vs. 51%; P = 0.053). In addition, there were significant differences between MetS patients with and without DM in terms of co-morbidities of hypertension, coronary heart disease, and high cholesterol. The proportion of MetS patients with positive family history for MetS was significantly higher in MetS patients with T2DM as compared to those without T2DM (46.7% vs. 33.8%; P = 0.009). The proportion of positive family history of MetS among fathers (35% vs. 21.9%; P = 0.005), mothers (30.5% vs. 18.8%; P = 0.008), maternal aunt (18.3% vs. 11.2%; P = 0.055), and maternal grand father (19.5% vs. 10%; P = 0.010) were significantly higher in MetS patients with T2DM as compared to the counterpart. The proportion of consanguineous marriages was almost two times higher among MetS patients with T2DM as compared to those without T2DM (80.9% vs. 41.9%; P < 0.001). The proportion of MetS patients with T2DM was lower than MetS patients without DM below 45 years, but after 45 years, the proportion of MetS patients with T2DM remained higher than their counterparts. CONCLUSION: Family history of MetS among parents, maternal aunt, maternal grandfather, and consanguineous marriages among patients of MetS are significantly associated with the development of T2DM in Qatar. These results support the necessity of earlier screening for T2DM among MetS patients with positive family history of MetS.

12.
Appl Clin Genet ; 6: 103-11, 2013.
Article in English | MEDLINE | ID: mdl-24187509

ABSTRACT

AIM: The aim of this study was to investigate the association of the Pro12Ala polymorphism of the human peroxisome proliferator-activated receptor gamma 2 (PPARγ2) gene with hypertension and obesity in a highly consanguineous aboriginal Qatari population. DESIGN: A cross-sectional survey conducted from January 2011-December 2012. SETTING: Primary health care clinics. SUBJECTS: A random sample of 1,528 Qatari male and female population older than 20 years of age. MATERIALS AND METHODS: Data on age, sex, income, level of education, occupation status, body mass index, and blood pressure and lipid profile were obtained. The Pro12Ala in the PPARγ2 gene was detected on the LightCycler® using two specific probes: (Sensor [G] 5'-CTC CTA TTG ACG CAG AAA GCG-FL and PPAR Anchor 5' LC Red 640- TCC TTC ACT GAT ACA CTG TCT GCA AAC ATA TC-PH). Univariate and multivariate logistic regression were performed. RESULT: Out of a total 1,528 participants, 220 were diagnosed with essential hypertension, and 420 were obese. Participants with consanguinity were significantly higher among hypertensive than normotensive (41.9% versus 30.8%; P=0.001). Altogether, more than three-fourths (89%) of the participants had a wild genotype (Pro12Pro), 9.8% were heterozygous with Pro12Ala, and only 1.2% was homozygous with the Ala12Ala genotype. The frequency of the Pro allele was 94.5% in normotensive versus 90.5% in hypertensive, while the distribution of the Ala allele was 5.5% in normotensive versus 9.5% in the hypertensive group (P=0.001). The odds of hypertension were 1.7 times higher among the participants with the Ala allele as compared to those with the Pro, while adjusting for other potential confounders (adjusted odds ratio 1.69; 95% confidence interval 1.12-2.55; P=0.012). There was no association between the PPARγ2Ala allele and obesity (P=0.740). CONCLUSION: The current study revealed an association between the PPARγ2Ala allele and hypertension in Qatar's population. On the other hand, this study found no association between the Ala allele and obesity.

13.
J Obes ; 2013: 269038, 2013.
Article in English | MEDLINE | ID: mdl-24000310

ABSTRACT

AIM: The aim was to compare body mass index (BMI), waist circumference (WC), waist hip ratio (WHR), and waist height ratio (WHtR) to identify the best predictor of metabolic syndrome (MetS) among Qatari adult population. METHODS: A cross-sectional survey from April 2011 to December 2012. Data was collected from 1552 participants followed by blood sampling. MetS was defined according to Third Adult Treatment Panel (ATPIII) and International Diabetes Federation (IDF). Receiver operating characteristics (ROC) curve analysis was performed. RESULTS: Among men, WC followed by WHR and WHtR yielded the highest area under the curve (AUC) (0.78; 95% CI 0.74-0.82 and 0.75; 95% CI 0.71-0.79, resp.). Among women, WC followed by WHtR yielded the highest AUC (0.81; 95% CI 0.78-0.85 & 0.79; 95% CI 0.76-0.83, resp.). Among men, WC at a cut-off 99.5 cm resulted in the highest Youden index with sensitivity 81.6% and 63.9% specificity. Among women, WC at a cut-off 91 cm resulted in the highest Youden index with the corresponding sensitivity and specificity of 86.5% and 64.7%, respectively. BMI had the lowest sensitivity and specificity in both genders. CONCLUSION: WC at cut-off 99.5 cm in men and 91 cm in women was the best predictor of MetS in Qatar.


Subject(s)
Body Mass Index , Metabolic Syndrome/epidemiology , Obesity/diagnosis , Obesity/epidemiology , Waist Circumference , Waist-Hip Ratio , Adult , Age Factors , Aged , Area Under Curve , Chi-Square Distribution , Cross-Sectional Studies , Female , Humans , Logistic Models , Male , Middle Aged , Multivariate Analysis , Obesity/physiopathology , Predictive Value of Tests , Prognosis , Qatar/epidemiology , ROC Curve , Risk Assessment , Risk Factors , Sex Factors
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