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Jahan H, Choudhary MI, Atta A, Khan KM, Ur-Rahman A. Anthranilic Acid Derivatives: Novel Inhibitors of Protein Glycation and the Associated Oxidative Stress in the Hepatocytes. Med Chem 2018; 14:516-523. [PMID: 29065839 DOI: 10.2174/1573406413666171020120528] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Revised: 10/11/2017] [Accepted: 10/12/2017] [Indexed: 11/22/2022]
Abstract
BACKGROUND Anthranilic acid derivatives are important pharmacophores in drug discovery. Several of them are currently being used, such as mefenamic acid and meclofenamates, possess analgesic, anti-inflammatory and antipyretic activities. Some anthranilic acid-based scaffolds have also been reported for the management of metabolic disorders. OBJECTIVES The aim of the current study was to investigate the antiglycation potential of 2-anilino benzoic acid derivatives against (N-phenylanthranilic acid) fructose- human serum albumin (HSA) glycation. The study also analyzed the effects of newly identified antiglycation inhibitors on AGEs-mediated intracellular reactive oxygen species production, and associated impaired proliferation of the hepatocytes. METHODS The present study focuses on the antiglycation activity of 2- anilinobenzoic acid derivatives 1-18 in in-vitro human serum albumin (HSA)- fructose model. These derivatives were also identified as non-toxic to 3T3 mouse fibroblast cell-line using metabolic assay. The effect of the most promising derivative 1, 2- (2, 4- dinitroanilino)benzoic acid, was studied in a dose dependent manner, co-incubated with fructose-derived AGEs (0- 200 μg/mL), on rat hepatocytes proliferation and associated intracellular generation of ROS via MTT assay and DCFH-DA technique, respectively. RESULTS We found that derivative 1 ameliorates the elevated intracellular oxidative stress and associated diminished proliferation of the hepatocytes in response to AGEs. CONCLUSION In conclusion, we identify novel 2- anilino benzoic acid derivatives as antiglycation agents through in-vitro and cellular-based models.
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Arshia, Jabeen A, Faheem A, Khan KM, Shah S, Perveen S. Benzophenone Esters and Sulfonates: Synthesis and their Potential as Antiinflammatory Agents. Med Chem 2018; 15:162-174. [PMID: 30081790 DOI: 10.2174/1573406414666180806114825] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 07/24/2018] [Accepted: 08/03/2018] [Indexed: 11/22/2022]
Abstract
BACKGROUND Inflammation is a biological rejoinder of vascular tissues against destructive agents e.g. irritants, damaged cell or pathogens. During inflammation, respiratory burst occurs by activated phagocytes which help to destroy invading pathogens. Phagocytic cells such as neutrophils and macrophages are one of the major sources of reactive oxygen species (ROS) and nitric oxide (NO). Normally, the redox environment is maintained by various antioxidant defense systems, however, these reactive oxygen species may be destructive and can lead to various pathological conditions. METHODS Benzophenone esters and sulfonates (1-18) were synthesized through one pot synthesis by reacting 4-hydroxy benzophenone either different benzoyl chloride or sulfonyl chloride. These synthetic compounds were evaluated for their in vitro immunosuppressive potential on two parameters of innate immune response including inhibition of intracellular reactive oxygen species (ROS) and nitric oxide (NO). ROS were induced in polymorphonuclear leukocytes (PMNs) isolated from human whole blood by serum opsonized zymosan stimulation, whereas NO were produced in J774.2 cells by lipopolysachharides (LPS) stimulation. Moreover, cytotoxicity of compounds was also determined using NIH-3T3 fibroblast cells (ATCC, Manassas, USA) was evaluated by using the standard MTT colorimetric assay. RESULTS All compounds inhibited the production of ROS at various extent among which compounds 2, 5, 6, 8, 10, 13 and 16 were found to be the potent inhibitors of ROS with IC50 values ranging between (1.0 - 2.2 µg/mL) as compared to ibuprofen (IC50 = 2.5 ± 0.6 µg/mL) as the standard drug. Compounds 2, 7, 11, 13, 14 and 18 showed good inhibition of NO production with % inhibition values ranging between (63.6% - 76.7%) at concentration of 25 µg/mL as compared to NG-monomethyl-Larginine (L-NMMA 65.6 ± 1.1 µg/mL) as the standard. All other derivatives showed moderate to low level of inhibition on both tested parameters. Cytotoxicity activity also showed nontoxicity of synthetic compounds. Structures of all the synthetic compounds were confirmed through 1H-NMR, 13C-NMR, EI-MS and HREI-MS spectroscopic techniques. CONCLUSION Compounds 2 and 13 were found to be good dual antiinflammatory (ROS and NO) agent. However, compounds 5, 6, 8, 10 and 16 were found to be selectively active for ROS inhibitory studies. Compounds 7, 11, 14 and 18 were discriminatory active at NO inhibition assay. These initial findings of antiinflammatory activity concluded that these compounds might have the potential to develop a novel non-steroidal antiinflammatory drugs (NSAIDs), non-acidic antiinflammatory agent. Most active compounds 2, 5-8, 10, 13, 14 and 16 showed nontoxicity of synthetic compounds.
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Zafar H, Iqbal S, Javaid S, Khan KM, Choudhary MI. Xanthine Oxidase Inhibitory and Molecular Docking Studies on Pyrimidones. Med Chem 2018; 14:524-535. [DOI: 10.2174/1573406413666171129224919] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 11/26/2017] [Accepted: 11/28/2017] [Indexed: 11/22/2022]
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Kaufman SS, Zhong XS, Elsabbagh AM, Bailey D, Yazigi NA, Khan KM, Matsumoto CS. Fecal pancreatic elastase-1 in the evaluation of pancreatic function after pediatric intestinal transplantation. Pediatr Transplant 2018; 22:e13247. [PMID: 29927031 DOI: 10.1111/petr.13247] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/14/2018] [Indexed: 12/13/2022]
Abstract
Fat malabsorption is common after SBT. To identify whether anatomic variant transplants differ in occurrence of exocrine pancreatic insufficiency that could contribute to fat malabsorption, we measured FPE repeatedly in 54 recipients of a SBT, ages 6.2 to 320 months. FPE determination most distant from SBT was 6.1 years. Of the 54, 39% received an isolated intestinal graft (native pancreas only), 48% received an en bloc liver-intestinal-pancreas graft (native and graft pancreas), and 13% received a multivisceral graft (graft pancreas only). Initial FPE was normal (>200 μg/g) in 15 of the 54 at a median of 22 (11-61) days after SBT. Recipients of a liver-intestine-pancreas transplant were more likely to have normal FPE within 30 days after SBT than were isolated intestinal or multivisceral transplant recipients (47%, 19%, and 0%, respectively, P = .049). Of the remaining 39 patients, 34 eventually demonstrated a normal FPE at a median of 168 (31-943) days after SBT. Type of SBT did not influence the likelihood of achieving a normal FPE level or time when it occurred. Five (9%) patients failed to achieve normal FPE, including 3 who died within 2 years after SBT. In conclusion, possessing both graft and native pancreas as in transplantation of an en bloc liver-intestinal-pancreas graft facilitates early normalization of FPE that eventually occurs in most patients irrespective of transplant type. Failure to recover normal pancreatic function may be associated with severe post-transplant complications.
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Khan KM, Baidya R, Aryal A, Farmer JR, Valliant J. Neurological and mental health outcomes among conventional and organic farmers in Indiana, USA. ANNALS OF AGRICULTURAL AND ENVIRONMENTAL MEDICINE : AAEM 2018; 25:244-249. [PMID: 29936818 DOI: 10.26444/aaem/75113] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
INTRODUCTION Every farming method, whether conventional or organic, has been associated with some sort of risky behaviors leading to health issues among farmers. Substantial evidence is not available in the literature to determine whether the magnitudes of health outcomes vary between conventional and organic farmers. The study investigated whether self-reported neurological and mental health symptoms differ between conventional and organic farmers living in Indiana, USA. MATERIAL AND METHODS A self-reported questionnaire survey collected information from 200 conventional and 157 organic farmers of Indiana on demographic characteristics, depression and neurological symptoms. Statistical analyses were conducted to observe the differences in self-reported symptoms by groups of farmers. RESULTS It was observed that the conventional farmers had significantly higher age-adjusted mean neurological symptom score (p<0.01) than the organic farmers. Regression models revealed positive and significant associations of conventional farming with total (β =1.34; p=0.02), sensory (β =0.83; p=0.001) and behavioural (β =0.09; p=0.03) symptoms after accounting for age, income, education and years in farming. Positive but non-significant associations were also observed in conventional farmers with cognitive and motor symptoms, and with all subscales of depression symptoms in the adjusted models. CONCLUSIONS The findings obtained suggest the importance of a larger study to further explain the difference in mental and neurological health effects in these two categories of farmers.
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Hawksworth JS, Desai CS, Khan KM, Kaufman SS, Yazigi N, Girlanda R, Kroemer A, Fishbein TM, Matsumoto CS. Visceral transplantation in patients with intestinal-failure associated liver disease: Evolving indications, graft selection, and outcomes. Am J Transplant 2018; 18:1312-1320. [PMID: 29498797 PMCID: PMC5992069 DOI: 10.1111/ajt.14715] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 12/11/2017] [Accepted: 02/04/2018] [Indexed: 01/25/2023]
Abstract
Intestinal failure (IF)-associated liver disease (IFALD) is widely recognized as a lethal complication of long-term parenteral nutrition. The pathophysiology of IFALD is poorly understood but appears to be multifactorial and related to the inflammatory state in the patient with IF. Visceral transplant for IFALD includes variants of intestine, liver, or combined liver-intestine allografts. Graft selection for an individual patient depends on the etiology of IF, abdominal and vascular anatomy, severity of IFALD, and potential for intestinal rehabilitation. The past decade has witnessed dramatic improvement in the management of IFALD, principally due to improved lipid emulsion formulations and the multidisciplinary care of the patient with IF. As the recognition and treatment of IFALD continue to improve, the requirement of liver-inclusive visceral grafts appears to be decreasing, representing a paradigm shift in the care of the patient with IF. This review highlights the current indications, graft selection, and outcomes of visceral transplantation for IFALD.
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Iqbal S, Shaikh NN, Khan KM, Naz S, Ul-Haq Z, Perveen S, Choudhary MI. 2-Oxo-1,2,3,4-tetrahydropyrimidines Ethyl Esters as Potent β- Glucuronidase Inhibitors: One-pot Synthesis, In vitro and In silico Studies. Med Chem 2018; 14:818-830. [PMID: 29793412 DOI: 10.2174/1573406414666180525105325] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 04/20/2018] [Accepted: 04/29/2018] [Indexed: 11/22/2022]
Abstract
BACKGROUND Glucuronidation is essential for the metabolism and excretion of toxic substances. β-Glucuronidase enzyme slows down the process of glucuronidation, and thus plays an important role in the on-set of colorectal carcinoma, and many other diseases. Inhibition of β- glucuronidase activity is thus identified as an important approach for the treatment of several diseases. OBJECTIVE Current study was aimed to synthesize a library of 2-oxo-1,2,3,4-tetrahydropyrimidine and to evaluate their β-glucuronidase inhibitory activity, and their mode of enzyme inhibition. METHOD We synthesized a series of 2-oxo-1,2,3,4-tetrahydropyrimidines 1-25 by fusing urea, ethyl acetoacetate, and a variety of aldehydes using copper nitrate trihydrate as catalyst. All synthesized compounds were evaluated for their in vitro β-glucuronidase inhibitory activity. In addition, molecular docking studies were also performed by using MOE docking tools. RESULTS Eighteen compounds showed inhibitory activity better than the standard D-saccharic acid 1,4-lactone, a well known β-glucuronidase inhibitor (IC50 = 45.75 ± 2.16 µM). Compound 20 (IC50 = 1.36 ± 0.03 µM) showed an excellent inhibitory activity, thirty-five folds superior to the standard. Docking results highlighted the role of various chemical moieties at different positions on 2- oxo-1,2,3,4-tetrahydropyrimidine skeleton in enzyme inhibitory activity. CONCLUSION This study has identified a class of potent β-glucuronidase inhibitors with the potential to be investigated further.
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Yasir A, Ishtiaq S, Jahangir M, Ajaib M, Salar U, Khan KM. Biology-Oriented Synthesis (BIOS) of Piperine Derivatives and their Comparative Analgesic and Antiinflammatory Activities. Med Chem 2018. [DOI: 10.2174/1573406413666170623083810] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Rahman A, Khan KM, Rao MS. Exposure to low level of lead during preweaning period increases metallothionein-3 expression and dysregulates divalent cation levels in the brain of young rats. Neurotoxicology 2018; 65:135-143. [PMID: 29452138 DOI: 10.1016/j.neuro.2018.02.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Revised: 02/11/2018] [Accepted: 02/12/2018] [Indexed: 12/11/2022]
Abstract
Lead (Pb) is a neurotoxic heavy metal, but the mechanism of its neurotoxicity is not clearly understood. Expression of metallothioneins (MTs) is induced in response to heavy metal exposure as a protective mechanism against heavy metal toxicity. There are several isoforms of MTs (MT-1 to 4), of which MT-3 is the neuron specific isoform, which also has neurite growth inhibitory effects. Whereas, the induction of MT-1 and 2 in response to Pb has been reported, the effect of Pb on the expression of MT-3 in the brain has not been documented. This study aimed at investigating the effect of Pb exposure on the expression of MT-3 in the cerebrum and hippocampus. Wistar rat pups were exposed to Pb via their dams' drinking water (0.2% lead acetate in deionized water) from postnatal day (PND) 0 to 21 and directly via drinking water until PND30. Expression of MT-3 was measured by Western blot and quantitative RT-PCR. MT-3 localization was done by immunohistochemistry. Divalent metal ions were analysed by atomic absorption spectrophotometry. Levels of Pb in blood and cerebrum were significantly increased, while that of copper (Cu), zinc (Zn) and manganese (Mn) were significantly decreased in the Pb-exposed rats at both PND21 and PND30. MT-3 protein was significantly increased in the cerebrum (by 2.5-fold) and in hippocampus (1.4 to 3.2-fold) in both PND21 and PND30 Pb-exposed rats over controls. MT-3 gene expression also increased in the cerebrum (by 42%), and in the hippocampus (by 65% and 43% in the PND21 and PND30 rats, respectively), in the Pb-exposed rats over controls, but the increase was statistically significant (p < 0.05) only in the PND30 rats. Pb exposure significantly increased (p < 0.05) percentage of MT-3 immunoreactive cells in Cornu Ammonis and dentate gyrus regions in the PND21 rats, and in the Cornu Ammonis 1, dentate gyrus and cortex regions in the PND30 rats. Our data thus provide convincing evidence that exposure to low levels of Pb during preweaning period increases the expression of MT-3 in the brain of rats.
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Elsabbagh AM, Hawksworth J, Khan KM, Yazigi N, Matsumoto CS, Fishbein TM. World's smallest combined en bloc liver-pancreas transplantation. Pediatr Transplant 2018; 22:10.1111/petr.13082. [PMID: 29139617 PMCID: PMC6433131 DOI: 10.1111/petr.13082] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/08/2017] [Indexed: 11/30/2022]
Abstract
We present a case of a 2-year-old child who underwent a combined en bloc liver and pancreas transplant following complications of WRS. WRS is characterized clinically through infantile insulin-dependent diabetes mellitus, neutropenia, recurrent infections, propensity for liver failure following viral infections, bone dysplasia, and developmental delay. Usually, death occurs from fulminant liver and concomitant kidney failure. Few cases with WRS are reported in the literature, mostly from consanguineous parents. To the best of our knowledge, combined en bloc liver and pancreas transplant has not been performed in small children.
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Yousuf S, Khan KM, Salar U, Jabeen A, Ahmed S, Muhammad MT, Faheem A, Perveen S. New Bis-Pyrazolones as Potential Leads for ROS Inhibition; Environment Friendly Green Synthesis, Structural Characterization, and In Vitro Studies. Med Chem 2018; 14:536-548. [PMID: 29332595 DOI: 10.2174/1573406414666180112122001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2017] [Revised: 11/09/2017] [Accepted: 01/08/2018] [Indexed: 11/22/2022]
Abstract
BACKGROUND Pyrazolones have identified as significant antioxidant agents and many marketed and clinically prescribed NSAIDs have pyrazolone ring as main scaffold. METHOD Keeping in consideration the antioxidant potential of pyrazolone scaffold, new bispyrazolones 3-30 were synthesized by a green and enviroment friendly reaction route, in which two equivalents of 1-(4-chlorophenyl)-3-methyl-1H-pyrazol-5-ol were treated with one equivalent of benzaldehyde derivatives without any catalyst. All compounds were structurally characterzied by 1H-NMR and FAB analysis. 13C-NMR of selected compounds was also recorded. All compounds gave satisfactory elemental analyses and found in good agreement with calculated values. RESULTS Synthetic bis-pyrazolones 3-30 were evaluated for their oxidative burst inhibitory effect of zymosan stimulated whole blood phagocytes by using luminol enhanced chemilluminescence technique. All molecules demonstrated the potent ROS inhibition activity in the range of IC50 = 1.2 ± 0.1-48.8 ± 3.9 µM as compared to the standard ibuprofen (IC50 = 54.2 ± 9.2 μM). The purity of active compounds was checked by HPLC. CONCLUSION This study has identified a number of non-acidic lead molecules for future research on ROS inhibitors.
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Salar U, Khan KM, Fakhri MI, Hussain S, Tauseef S, Ameer S, Wadood A, Khan H, Perveen S. 1,1'-Carbonyldiimidazole (CDI) Mediated Facile Synthesis, Structural Characterization, Antimicrobial Activity, and in-silico Studies of Coumarin- 3-carboxamide Derivatives. Med Chem 2018. [DOI: 10.2174/1573406413666170623083116] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Bano B, Khan KM, Jabeen A, Hameed A, Faheem A, Taha M, Perveen S, Iqbal S. Aminoquinoline Schiff Bases as Non-Acidic, Non-Steroidal, Anti-Inflammatory Agents. ChemistrySelect 2017. [DOI: 10.1002/slct.201702200] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Desai CS, Khan KM, Ma X, Li H, Wang J, Fan L, Chen G, Smith JP, Cui W. Effect of liver histopathology on islet cell engraftment in the model mimicking autologous islet cell transplantation. Islets 2017; 9:140-149. [PMID: 28902579 PMCID: PMC5710696 DOI: 10.1080/19382014.2017.1356558] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND The inflammatory milieu in the liver as determined by histopathology is different in individual patients undergoing autologous islet cell transplantation. We hypothesized that inflammation related to fatty-liver adversely impacts islet survival. To test this hypothesis, we used a mouse model of fatty-liver to determine the outcome of syngeneic islet transplantation after chemical pancreatectomy. METHODS Mice (C57BL/6) were fed a high-fat-diet from 6 weeks of age until attaining a weight of ≥28 grams (6-8 weeks) to produce a fatty liver (histologically > 30% fat);steatosis was confirmed with lipidomic profile of liver tissue. Islets were infused via the intra-portal route in fatty-liver and control mice after streptozotocin induction of diabetes. Outcomes were assessed by the rate of euglycemia, liver histopathology, evaluation of liver inflammation by measuring tissue cytokines IL-1β and TNF-α by RT-PCR and CD31 expression by immunohistochemistry. RESULTS The difference in the euglycemic fraction between the normal liver group (90%, 9/10) and the fatty-liver group (37.5%, 3/8) was statistically significant at the 18th day post- transplant and was maintained to the end of the study (day 28) (p = 0.019, X2 = 5.51). Levels of TNF-α and IL-1β were elevated in fatty-liver mice (p = 0.042, p = 0.037). Compared to controls cytokine levels were elevated after islet cell transplantation and in transplanted fatty-liver mice as compared to either fatty- or islet transplant group alone (p = NS). A difference in the histochemical pattern of CD31 could not be determined. CONCLUSION Fatty-liver creates an inflammatory state which adversely affects the outcome of autologous islet cell transplantation.
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Khan HH, Schroeder L, Fitzpatrick MS, Kaufman SS, Yazigi NA, Yurasek GK, Steinhorn DM, Fishbein TM, Khan KM. Successful venoarterial extracorporeal membrane oxygenation for prolonged hepatopulmonary syndrome following pediatric liver transplantation: A case report and review of the literature. Pediatr Transplant 2017; 21. [PMID: 28833992 DOI: 10.1111/petr.13036] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/27/2017] [Indexed: 01/16/2023]
Abstract
HPS is a major complicating feature of end-stage liver disease. Diagnosis is clinical, and LT is the only definitive treatment. While the general impression is that HPS improves quickly after transplantation, it may not always be the case. We describe the smallest reported child with HPS prior to LT and requiring prolonged venoarterial extracorporeal membrane oxygenation after LT; especially as it is a rare occurrence, physician managing such cases should be aware of the circumstances under which HPS may require specific treatment.
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Hussain ASM, Renno WM, Sadek HL, Kayali NM, Al-Salem A, Rao MS, Khan KM. Monoamine oxidase-B inhibitor protects degenerating spinal neurons, enhances nerve regeneration and functional recovery in sciatic nerve crush injury model. Neuropharmacology 2017; 128:231-243. [PMID: 29054367 DOI: 10.1016/j.neuropharm.2017.10.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 09/28/2017] [Accepted: 10/15/2017] [Indexed: 12/29/2022]
Abstract
Monoamine oxidase-B (MAOB), a flavin adenine dinucleotide (FAD), is an enzyme which catalyzes the oxidation of amines. MAOB is proposed to play a major role in the pathogenesis of neurodegeneration through the production of reactive oxygen species (ROS) and neurotoxins. The present study was designed to outline the effects of the MAOB inhibitor (MAOB-I) on neuroprotection of spinal neurons, regeneration of sciatic nerve fibers, and recovery of sensory-motor functions in the sciatic nerve crush injury model. Male Wistar rats (4-months-old) were assigned to i) Naïve (N), ii) Sham (S), iii) Sciatic nerve crush and treated with saline (CRUSH + SALINE) and iv) Sciatic nerve crush and treated with MAOB inhibitor (CRUSH + MAOB-I) groups (n = 10/group). In groups iii and iv, the crush injury was produced by crushing the sciatic nerve followed by treatment with saline or MAOB-I (Selegiline® 2.5 mg/kg) intraperitoneally for 10 days. Behavioral tests were conducted from week 1 to week 6. At the end of the study, sciatic nerve and lumbar spinal cord were examined by immunohistochemistry, light and electron microscopy. MAOB-I treatment showed significant improvement in sensory and motor functions compared to saline treatment (p < 0.05-0.001) in injured nerves. The morphological study showed a significantly increased number of nerve fibers in sciatic nerve distal to the site of injury (p < 0.05), with better myelination pattern in CRUSH + MAOB-I treated group compared to CRUSH + SALINE group. Spinal cord ventral horns showed a significant increase in the number of NeuN-immunoreactive neurons in the MAOB-I treated group compared to Saline treated group (p < 0.01). MAOB-I has a significant potential for protecting the degenerating spinal cord neurons and enhancing the regeneration of injured sciatic nerve fibers following crush injury.
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Macri EM, Felson DT, Zhang Y, Guermazi A, Roemer FW, Crossley KM, Khan KM, Stefanik JJ. Patellofemoral morphology and alignment: reference values and dose-response patterns for the relation to MRI features of patellofemoral osteoarthritis. Osteoarthritis Cartilage 2017; 25. [PMID: 28648740 PMCID: PMC5605424 DOI: 10.1016/j.joca.2017.06.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVE We aimed to (1) determine reference values for trochlear morphology and patellofemoral (PF) alignment in adults without magnetic resonance imaging (MRI)-defined PF full thickness cartilage damage or knee pain; and (2) evaluate dose-response patterns for these measures with prevalent MRI-defined PF structural damage and/or knee pain. DESIGN The Framingham Community Cohort is a population-based sample of ambulatory adults aged ≥50 years. We evaluated six morphology and alignment measures using MRI (n = 985), and reported reference values (mean ± 2SD) in a subsample without MRI-defined PF full thickness cartilage damage or knee pain (n = 563). With restricted cubic spline Poisson regression, we evaluated dose-response patterns of each of the six measures with prevalent MRI-defined PF structural damage or joint pain. Our primary outcome was full thickness cartilage damage. RESULTS For dose-response curves, prevalence ratios (PR) increased monotonically for all measures except patellar tilt, which rose with both lateral and medial tilt. Associations were generally strongest in the lateral PF compartment. PR for the strongest predictors of full thickness cartilage damage reached clinical relevance (PR > 1.5) at sulcus angle (SA) ≥135.0°; patellar tilt angle at ≤1.0° and ≥15.0°; and bisect offset ≥57.0%. Lateral trochlear inclination (LTI) achieved PR > 1.5 at ≤23.0° for full thickness cartilage damage with pain. CONCLUSIONS SA, patellar tilt, and bisect offset were most strongly associated with full thickness cartilage damage. LTI, patellar tilt and bisect offset had stronger associations with the addition of pain. These findings contribute to better identifying a subset of patients who may benefit from mechanically based interventions.
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Khan KM, Evans SS, Bielko SL, Rohlman DS. Efficacy of technology-based interventions to increase the use of hearing protections among adolescent farmworkers. Int J Audiol 2017; 57:124-134. [PMID: 28918682 DOI: 10.1080/14992027.2017.1374568] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
OBJECTIVE Adolescent farmworkers are exposed to loud noise during farm activities. We present a prospective study that evaluated the efficacy of low-cost, technology-based intervention approaches in high schools to enhance the use of hearing protection among adolescent farmworkers. DESIGN Six high schools in Iowa that agreed to participate in the study were divided into three equal groups through cluster-randomisation with each group receiving one of the three formats of hearing protection intervention: (a) classroom training, (b) classroom training coupled with smartphone app training and (c) computer training. Participants completed baseline (pre-training) and six-week post-intervention surveys for assessing hearing protection knowledge, attitudes and behaviour. STUDY SAMPLE Seventy participants from six schools were initially enrolled but 50 completed both pre- and post-intervention surveys. RESULTS In most cases, all three groups showed significant improvement in hearing protection knowledge, attitude and frequency of use from pre- to post-intervention. However, changes between groups were statistically non-significant. CONCLUSIONS Although all three formats led to improvements on hearing protection knowledge, attitude and behaviour, the findings of the study, perhaps due to the small sample size, did not allow us to detect whether technology-based hearing protection interventions were more effective than the traditional face-to-face training for adolescent farmworkers.
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Khan KM, Bielko SL, Barnes PA, Evans SS, Main ALK. Feasibility of a low-cost hearing screening in rural Indiana. BMC Public Health 2017; 17:715. [PMID: 28923033 PMCID: PMC5604500 DOI: 10.1186/s12889-017-4724-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Accepted: 09/06/2017] [Indexed: 11/27/2022] Open
Abstract
Background Hearing loss remains a neglected public health issue in the rural and agricultural communities in the United States and therefore, promotion of a low-cost hearing screening may be important for these underserved populations. The major objectives of our study were to assess feasibility of a low-cost telephone-administered hearing test in rural Indiana and to identify the challenges, barriers and viable implementation strategies associated with this test. Also, we evaluated whether a focus group session could change the hearing health attitude of rural residents. Methods We recruited 126 adults from six rural Indiana counties who participated in study activities in the following order: 1) a pre-focus group demographic, knowledge and attitude survey, 2) a focus group for discussing the feasibility of a telephone-administered hearing screening, 3) a post focus group attitude survey and 4) hearing was screened using an audiometer and self-assessment scale. These activities generated both qualitative and quantitative data, which were subsequently analyzed. Results Hearing impairment was perceived as an important public health issue. Many participants expressed interests to try the low-cost National Hearing Test (NHT). However, participants recommended NHT to be facilitated by community organizations to provide access to landline phones. The focus group turned out to be an excellent awareness building activity producing significant improvement in hearing health attitudes. Comparison of self and audiometric evaluations indicated underestimation of hearing handicap in our rural study population. Conclusions The study results underscore the urgent need for an effective strategy to promote low-cost hearing screening in rural US communities.
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Al-Harbi AN, Khan KM, Rahman A. Developmental Vitamin D Deficiency Affects Spatial Learning in Wistar Rats. J Nutr 2017; 147:1795-1805. [PMID: 28747485 DOI: 10.3945/jn.117.249953] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 03/31/2017] [Accepted: 06/26/2017] [Indexed: 11/14/2022] Open
Abstract
Background: Vitamin D deficiency is a global problem. Recent evidence suggests that vitamin D is involved in brain development and function. Vitamin D deficiency has been associated with poor cognitive function in adults, but the effect of developmental vitamin D deficiency (DVDD) on cognitive function and brain development in children has not been well established.Objective: We explored the effects of DVDD on cognitive functions and brain morphology of rat pups.Methods: Wistar rat pups born to control and vitamin D-deficient dams were divided into 4 groups: control (C), deficient during gestation (dG), deficient during lactation (dL), and deficient during gestation and lactation (dGL). Spatial learning and memory were assessed by the Morris water maze test at postnatal day (PND) 24 and PND 45. Cortical thickness at the level of the hippocampus was measured at PND 63, and synapses were counted in specified areas of the hippocampus at PND 32 and PND 63.Results: Repeated-measures ANOVA revealed that at PND 24, learning (escape latency) was impaired (by 42%) in the dGL group, whereas at PND 45, both the dL and the dGL groups showed learning impairment (by 47% and 45%, respectively) compared with their respective C groups (P < 0.05). Short-term or long-term memory was largely unaffected by DVDD either at PND 24 or PND 45. Compared with the C group, all the DVDD groups had fewer synapses in the molecular layer of the hippocampus (P < 0.001). The synapse number decreased by 54% in the dGL group at PND 33 and by 70% in the dL and dGL groups at PND 63. All the DVDD groups at PND 63 showed a reduced cortical thickness (by 22%) compared with the C group (P < 0.05).Conclusion: These results suggest that a combined prenatal and postnatal DVDD for ≥6 wk in rat pups affects learning but not memory.
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Renno WM, Benov L, Khan KM. Possible role of antioxidative capacity of (-)-epigallocatechin-3-gallate treatment in morphological and neurobehavioral recovery after sciatic nerve crush injury. J Neurosurg Spine 2017; 27:593-613. [PMID: 28777065 DOI: 10.3171/2016.10.spine16218] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
OBJECTIVE This study examined the capacity of the major polyphenolic green tea extract (-)-epigallocatechin-3-gallate (EGCG) to suppress oxidative stress and stimulate the recovery and prompt the regeneration of sciatic nerve after crush injury. METHODS Adult male Wistar rats were randomly assigned to one of 4 groups: 1) Naïve, 2) Sham (sham injury, surgical control group), 3) Crush (sciatic nerve crush injury treated with saline), and 4) Crush+EGCG (sciatic nerve crush injury treated with intraperitoneally administered EGCG, 50 mg/kg). All animals were tested for motor and sensory neurobehavioral parameters throughout the study. Sciatic nerve and spinal cord tissues were harvested and processed for morphometric and stereological analysis. For the biochemical assays, the time points were Day 1, Day 7, Day 14, and Day 28 after nerve injury. RESULTS After sciatic nerve crush injury, the EGCG-treated animals (Crush+EGCG group) showed significantly better recovery of foot position and toe spread and 50% greater improvement in motor recovery than the saline-treated animals (Crush group). The Crush+EGCG group displayed an early hopping response at the beginning of the 3rd week postinjury. Animals in the Crush+EGCG group also showed a significant reduction in mechanical allodynia and hyperalgesia latencies and significant improvement in recovery from nociception deficits in both heat withdrawal and tail flick withdrawal latencies compared with the Crush group. In both the Crush+EGCG and Crush groups, quantitative evaluation revealed significant morphological evidence of neuroregeneration according to the following parameters: mean cross-sectional area of axons, myelin thickness in the sciatic nerve (from Week 4 to Week 8), increase of myelin basic protein concentration and gene expression in both the injured sciatic nerve and spinal cord, and fiber diameter to axon diameter ratio and myelin thickness to axon diameter ratio at Week 2 after sciatic nerve injury. However, the axon area remained much smaller in both the Crush+EGCG and Crush groups compared with the Sham and Naïve groups. The number of axons per unit area was significantly decreased in the Crush+EGCG and Crush groups compared with controls. Sciatic nerve injury produced generalized oxidative stress manifested as a significant increase of isoprostanes in the urine and decrease of the total antioxidant capacity (TAC) of the blood from Day 7 until Day 14. EGCG-treated rats showed significantly less increase of isoprostanes than saline-treated animals and also showed full recovery of TAC levels by Day 14 after nerve injury. In spinal cord tissue analysis, EGCG-treated animals showed induced glutathione reductase and suppressed induction of heme oxygenase 1 gene expression compared with nontreated animals. CONCLUSIONS EGCG treatment suppressed the crush-induced production of isoprostanes and stimulated the recovery of the TAC and was associated with remarkable alleviation of motor and sensory impairment and significant histomorphological evidence of neuronal regeneration following sciatic nerve crush injury in rats. The findings of this study suggest that EGCG can be used as an adjunctive therapeutic remedy for nerve injury. However, further investigations are needed to establish the antioxidative mechanism involved in the regenerative process after nerve injury. Only upregulation of glutathione reductase supports the idea that EGCG is acting indirectly via induction of enzymes or transcription factors.
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Desai CS, Khan KM. Critical Issues in Surgical Approach and Isolation Site for Islet Autotransplantation. JAMA Surg 2017; 152:556-557. [PMID: 28241216 DOI: 10.1001/jamasurg.2016.5709] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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I. Siddiqui N, A. Versiani M, Jawaid K, Shafique M, Hameed A, Ambreen N, Karim A, M. Khan K. Synthesis, Spectroscopic Characterization and Antimicrobial Activities of Benzoxazolone Derivatives. Med Chem 2017. [DOI: 10.2174/1573406413666161205121652] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Kumar R, Hussain S, Khan KM, Perveen S, Yousuf S. Crystal structure and Hirshfeld surface analysis of 1-(4-chloro-phen-yl)-2-{[5-(4-chloro-phen-yl)-1,3,4-oxa-diazol-2-yl]sulfan-yl}ethanone. ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS 2017; 73:524-527. [PMID: 28435712 PMCID: PMC5382613 DOI: 10.1107/s2056989017003978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 03/11/2017] [Indexed: 11/10/2022]
Abstract
In the title compound, C16H10Cl2N2O2S, the dihedral angles formed by the chloro-substituted benzene rings with the central oxa-diazole ring are 6.54 (9) and 6.94 (8)°. In the crystal, C-H⋯N hydrogen bonding links the mol-ecules into undulating ribbons running parallel to the b axis. Hirshfeld surface analysis indicates that the most important contributions for the crystal packing are the H⋯C (18%), H⋯H (17%), H⋯Cl (16.6%), H⋯O (10.4%), H⋯N (8.9%) and H⋯S (5.9%) inter-actions.
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Bano H, Hussain S, Khan KM, Perveen S, Yousuf S. Crystal structure and Hirshfeld surface analysis of 1-(4-bromo-phen-yl)-2-{[5-(pyridin-3-yl)-1,3,4-oxa-diazol-2-yl]sulfan-yl}ethan-1-one. Acta Crystallogr E Crystallogr Commun 2017; 73:623-626. [PMID: 28435735 PMCID: PMC5382636 DOI: 10.1107/s2056989017004819] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2017] [Accepted: 03/28/2017] [Indexed: 11/30/2022]
Abstract
In the title compound, C15H10BrN3O2S, the dihedral angles between the 1,3,4-oxa-diazole ring and the 3-pyridinyl and bromo-benzene rings are 12.17 (15) and 18.74 (15)°, respectively. In the crystal, the mol-ecules are linked into [100] chains by way of C-H⋯O, C-H⋯N, C-H⋯S hydrogen bonds. The Hirshfeld surface analysis indicates that the most important contributions to the packing are H⋯H (19.5%), N⋯H (17.3%), C⋯H (15.5%), Br⋯H (11.7%), and O⋯H (11.0%) inter-actions.
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