Design, synthesis and drug resistance reversal potential of novel curcumin mimics Van D

2021 ◽  
Vol 106 ◽  
pp. 104454
Author(s):  
Gaurav Raj Dwivedi ◽  
Sadiya Khwaja ◽  
Arvind Singh Negi ◽  
Swati S. Panda ◽  
A. Swaroop Sanket ◽  
...  
2016 ◽  
Vol 30 (10) ◽  
pp. 1708-1715 ◽  
Author(s):  
Rashmi Gaur ◽  
Vivek Kumar Gupta ◽  
Pooja Singh ◽  
Anirban Pal ◽  
Mahendra Padurang Darokar ◽  
...  

2019 ◽  
Vol 19 (10) ◽  
pp. 847-860 ◽  
Author(s):  
Gaurav R. Dwivedi ◽  
Anupam Maurya ◽  
Dharmendra K. Yadav ◽  
Feroz Khan ◽  
Mahendra K. Gupta ◽  
...  

Background: Due to the limited availability of antibiotics, Gram-negative bacteria (GNB) acquire different levels of drug resistance. It raised an urgent need to identify such agents, which can reverse the phenomenon of drug resistance. Objective: To understand the mechanism of drug resistance reversal of glycosides; niaziridin and niazirin isolated from the pods of Moringa oleifera and ouabain (control) against the clinical isolates of multidrug-resistant Escherichia coli. Methods: The MICs were determined following the CLSI guidelines for broth micro-dilution. In-vitro combination studies were performed by broth checkerboard method followed by Time-Kill studies, the efflux pump inhibition assay, ATPase inhibitory activity, mutation prevention concentration and in-silico studies. Results: The results showed that both glycosides did not possess antibacterial activity of their own, but in combination, they reduced the MIC of tetracycline up to 16 folds. Both were found to inhibit efflux pumps, but niaziridin was the best. In real time expression pattern analysis, niaziridin was also found responsible for the down expression of the two important efflux pump acrB & yojI genes alone as well as in combination. Niaziridin was also able to over express the porin forming genes (ompA & ompX). These glycosides decreased the mutation prevention concentration of tetracycline. Conclusion: This is the first ever report on glycosides, niazirin and niaziridin acting as drug resistance reversal agent through efflux pump inhibition and modulation of expression pattern drug resistant genes. This study may be helpful in preparing an effective antibacterial combination against the drug-resistant GNB from a widely growing Moringa oleifera.


2015 ◽  
Vol 86 (3) ◽  
pp. 272-283 ◽  
Author(s):  
Gaurav Raj Dwivedi ◽  
Anupam Maurya ◽  
Dharmendra Kumar Yadav ◽  
Feroz Khan ◽  
Mahendra P. Darokar ◽  
...  

2021 ◽  
Vol 142 ◽  
pp. 112084
Author(s):  
Gaurav Raj Dwivedi ◽  
Reeta Rai ◽  
Ramendra Pratap ◽  
Khusbu Singh ◽  
Sanghamitra Pati ◽  
...  

Author(s):  
Jaya Dwivedi ◽  
Neetu Yaduvanshi ◽  
Shruti Shukla ◽  
Sonika Jain

: Since 1887, phenoxazine derivatives have attracted attention of chemist due to its versatile utility, industrially and pharmacologically. Literature is found abundant with various pharmacological activities of phenoxazine derivatives like antitumor, anticancer, antifungal, antibacterial, anti-inflammatory, anti-diabetic, anti-viral, anti-malarial, antidepressant, analgesic and many other drug resistance reversal activities. This review covers detailed over-view on pharmacological application of phenoxazine nucleus, its chemistry and reactivity and also illustrating the incorporation of different group at different positions enhancing its biological application, besides some synthetic procedures.


Biomaterials ◽  
2021 ◽  
pp. 120649
Author(s):  
Xuan Xiao ◽  
Kewei Wang ◽  
Qingyu Zong ◽  
Yalan Tu ◽  
Yansong Dong ◽  
...  

Author(s):  
Jean Felix Mukerabigwi ◽  
Yu Han ◽  
Nannan Lu ◽  
Wendong Ke ◽  
Yuheng Wang ◽  
...  

Drug resistance of cisplatin significantly limits its therapeutic efficacy in clinical applications against a variety of cancers. Herein, we develop a novel strategy to overcome cisplatin drug resistance through sensitizing...


Heterocycles ◽  
2015 ◽  
Vol 90 (1) ◽  
pp. 482
Author(s):  
Takayuki Doi ◽  
Naoko Yamaguchi ◽  
Kosuke Ohsawa ◽  
Kazuoki Nakai ◽  
Masahito Yoshida ◽  
...  

2019 ◽  
Vol 62 (3) ◽  
Author(s):  
Israel Bonilla Landa ◽  
Osvaldo León De la Cruz ◽  
Diana Sánchez Rangel ◽  
Randy Ortiz Castro ◽  
Benjamin Rodriguez Haas ◽  
...  

Abstract. Fusarium Dieback, a new and lethal insect-vectored disease can host over 300 tree species including the avocado trees. This problem has recently attracted the attention of synthetic chemist not only to develop new triazol antifungal agents but also due to severe drug resistance to “classic” triazol antifungal agents. Here, a series of novel antifungal triazoles with a p-trifluoromethylphenyl moiety were synthesized and characterized by spectroscopic and spectrometric methods. Most of the target compounds synthesized showed from modest to good inhibitory activity and less phytotoxicity in comparison with the commercially available propiconazol; in particular, compounds 7 and 13 were active against both Fusarium solani and Fusarium euwallaceae. The results showed that compounds 7, 13, and 4 have great potential to be developed as new antifungal agents because of both good antifungal activity and low phytotoxicity. SAR showed that free alcohols and not O-protected compounds significantly influence the activity. Hence, a-methyl-a-1,2,4-triazole emerged as novel compound to develop new ketone-triazole-type antifungal agents for the management of Fusarium Dieback disease Resumen. Fusarium Dieback es una nueva enfermedad letal transmitida por insectos que actúan como vectores y puede atacar a más de 300 especies de árboles, incluidos los árboles de aguacate. Recientemente, este problema ha atraído la atención de los químicos sintéticos para desarrollar nuevos agentes antifúngicos triazólicos debido a la resistencia severa que desarrollan los insectos a los agentes antifúngicos triazólicos "clásicos". Durante este trabajo, se sintetizaron nuevos triazoles antifúngicos que contienen un grupo p-trifluorometilfenilo y se caracterizaron por métodos espectroscópicos y espectrométricos. La mayoría de los compuestos diana sintetizados mostraron una actividad inhibidora de modesta a buena y menos fitotoxicidad en comparación con el propiconazol que es comercialmente disponible; en particular, los compuestos 7 y 13 mostraron ser activos contra Fusarium solani y Fusarium euwallaceae. Los resultados mostraron que los compuestos 7, 13 y 4 tienen un gran potencial para desarrollarse como nuevos agentes antifúngicos debido a la buena actividad antifúngica y su baja fitotoxicidad. SAR mostró que los alcoholes libres y no los compuestos O-protegidos influyen significativamente en la actividad. Por lo tanto, el α-metil-α-1,2,4-triazol surgió como un nuevo compuesto líder para desarrollar nuevos agentes antifúngicos tipo cetona-triazol para el tratamiento de la enfermedad Fusarium Dieback.


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