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Pandya KM, Patel JJ, Patel AH, Patel NB, Desai PS. Substituted Imidazole-Pyrazole Clubbed Scaffolds: Microwave Assisted Synthesis and Examined Their In-vitro Antimicrobial and Antituberculosis Effects. LETT ORG CHEM 2021. [DOI: 10.2174/1570178617999200819164729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A series of substituted imidazole-pyrazole fused compounds were designed & fused
synthesized by employing Debus-Radziszewski one-pot synthesis reaction. Azoles are an extensive
and comparatively new class of synthetic compounds including imidazoles and pyrazoles. The
current clinical treatment uses compounds of azole framework. Azoles act by inhibiting ergosterol
synthesis pathway (a principal component of the fungal cell wall). In addition, a literature review
shows that the compounds that include imidazoles and pyrazoles have significant anti-bacterial and
anti-mycobacterial effects. In light of the above findings, a series of compounds with imidazole
and pyrazole scaffolds were sketched and developed to examine anti-bacterial, antifungal and antimycobacterial
activities. The structures of the synthesized compounds were characterized using
<sup>1</sup>HNMR, <sup>13</sup>CNMR, elemental analysis, and MS spectral data. The target compounds were screened
for their in-vitro antimicrobial activity against gram-positive and gram-negative bacterial species
by disc diffusion method according to the NCCLS (National Committee for Clinical Laboratory
Standards) and anti-mycobacterial activity against the Mycobacterium tuberculosis H37Rv strain.
The results revealed that imidazole-pyrazole fused scaffold compounds have potential antibacterial,
antifungal and anti-mycobacterial activities which can be further optimized to get a lead
compound.
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Affiliation(s)
- Keyur M. Pandya
- Department of Chemistry, Arts, Science and Commerce College, Veer Narmad South Gujarat University, Surat - 394185, Gujarat,India
| | - Janki J. Patel
- Department of Chemistry, Veer Narmad South Gujarat University, Surat- 395007, Gujarat,India
| | - Arpan H. Patel
- Department of Clinical Development, Immunocore LLC, 181 Washington Street, Conshohocken, Pennsylvania 19428,United States
| | - Navin B. Patel
- Department of Chemistry, Veer Narmad South Gujarat University, Surat- 395007, Gujarat,India
| | - Piyush. S. Desai
- Department of Chemistry, Arts, Science and Commerce College, Veer Narmad South Gujarat University, Surat - 394185, Gujarat,India
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Synthesis and biological evaluation of coumarin derivatives containing imidazole skeleton as potential antibacterial agents. Eur J Med Chem 2018; 143:958-969. [DOI: 10.1016/j.ejmech.2017.11.100] [Citation(s) in RCA: 93] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 11/16/2017] [Accepted: 11/29/2017] [Indexed: 12/28/2022]
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Lee K, Lim CH, Cho JH, Lee WG, Uh Y, Kim HJ, Yong D, Chong Y. High prevalence of ceftazidime-resistant Klebsiella pneumoniae and increase of imipenem-resistant Pseudomonas aeruginosa and Acinetobacter spp. in Korea: a KONSAR program in 2004. Yonsei Med J 2006; 47:634-45. [PMID: 17066507 PMCID: PMC2687749 DOI: 10.3349/ymj.2006.47.5.634] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
A nationwide antimicrobial resistance surveillance has been conducted since 1997 in Korea. In this study, susceptibility test data generated in 2004 by KONSAR group hospitals were analyzed and compared to those at a commercial laboratory. In hospitals, the rank orders of organisms in 2004 were identical to those in 2003. The most prevalent species was Staphylococcus aureus (20.2%) in hospitals, but Escherichia coli (29.7%) in the commercial laboratory. The proportions of Enterococcus faecium to all isolates of Enterococcus faecalis plus E. faecium were 47.2% in hospitals and 24.9% in the commercial laboratory. The mean resistance rates of significant antimicrobial-organism combinations in hospitals were: oxacillin-resistant S. aureus (68%), oxacillin-resistant (penicillin- nonsusceptible) Streptococcus pneumoniae (68%), vancomycin-resistant E. faecium (25%), cefotaxime-resistant E. coli (14%), ceftazidime- and cefoxitin-resistant Klebsiella pneumoniae (34% and 32%, respectively), and imipenem-resistant Acinetobacter spp. and Pseudomonas aeruginosa (17% and 24%, respectively). In conclusion, oxacillin-resistant staphylococci, expanded-spectrum cephalosporin-resistant K. pneumoniae, and imipenem-resistant Acinetobacter spp. and P. aeruginosa were prevalent in 2004. Increasing trends were observed for vancomycin-resistant E. faecium, cefoxitin- resistant E. coli and K. pneumoniae, and imipenem-resistant Acinetobacter spp. and P. aeruginosa. Certain antimicrobial- organism combinations were also prevalent among the commercial laboratory-tested strains.
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Affiliation(s)
- Kyungwon Lee
- Department of Laboratory Medicine, Yonsei University College of Medicine, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-752, Korea.
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Lee K, Park KH, Jeong SH, Lim HS, Shin JH, Yong D, Ha GY, Chong Y. Further increase of vancomycin-resistant Enterococcus faecium, amikacin- and fluoroquinolone-resistant Klebsiella pneumoniae, and imipenem-resistant Acinetobacter spp. in Korea: 2003 KONSAR surveillance. Yonsei Med J 2006; 47:43-54. [PMID: 16502484 PMCID: PMC2687580 DOI: 10.3349/ymj.2006.47.1.43] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Monitoring temporal trends of antimicrobial resistance can provide useful information for the empirical selection of antimicrobial agents to treat infected patients and for the control of nosocomial infections. In this study, we analyzed antimicrobial resistance of clinically relevant bacteria in 2003 at Korean hospitals and at a commercial laboratory. The following organism-antimicrobial agent resistance combinations were very prevalent: oxacillin-resistant Staphylococcus aureus (68%), expanded-spectrum cephalosporin-resistant Klebsiella pneumoniae (25%), and fluoroquinolone-resistant Escherichia coli (33%), Acinetobacter spp. (58%), and Pseudomonas aeruginosa (40%). Moreover, gradual increases in vancomycin-resistant Enterococcus faecium (20%), cefoxitin-resistant E. coli (10%) and K. pneumoniae (23%), and imipenem-resistant P. aeruginosa (20%) and Acinetobacter spp. (13%) were also observed. The resistance rates of Acinetobacter spp. to most antimicrobial agents at hospitals and at the commercial laboratory were similar. Among the Acinetobacter spp. isolated at a tertiary-care hospital, 46.2% were multidrug-resistant to 9-12 of 13 antimicrobial agents, and 18.3% were panresistant. The exclusion of duplicate isolates at a tertiary-care hospital significantly lowered the proportion of oxacillin-resistant S. aureus, vancomycin-resistant E. faecium, and fluoroquinolone-resistant E. coli.
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Affiliation(s)
- Kyungwon Lee
- Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - Ki Hyung Park
- Department of Laboratory Medicine, Busan Medical Center, Busan, Korea
| | - Seok Hoon Jeong
- Department of Laboratory Medicine, Kosin University Gospel Hospital, Busan, Korea
| | - Hwan Sub Lim
- Department of Laboratory Medicine, Kwandong University Myongji Hospital, Kyunggi, Korea
| | - Jong Hee Shin
- Department of Laboratory Medicine, Chonnam University Medical School, Kwangju, Korea
| | - Dongeun Yong
- Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - Gyoung-Yim Ha
- Department of Laboratory Medicine, Dongguk University, Kyongju Hospital, Kyongju, Korea
| | - Yunsop Chong
- Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Korea
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Yasunaka K, Abe F, Nagayama A, Okabe H, Lozada-Pérez L, López-Villafranco E, Muñiz EE, Aguilar A, Reyes-Chilpa R. Antibacterial activity of crude extracts from Mexican medicinal plants and purified coumarins and xanthones. JOURNAL OF ETHNOPHARMACOLOGY 2005; 97:293-299. [PMID: 15707768 DOI: 10.1016/j.jep.2004.11.014] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2003] [Revised: 11/01/2004] [Accepted: 11/15/2004] [Indexed: 05/24/2023]
Abstract
Thirty-two extracts from 22 Mexican medicinal plants of 15 different families were assayed to determine their antibacterial activity against Escherichia coli and Staphylococcus aureus. Seventeen plants showed antibacterial activity, while five plants showed no activity against both bacteria. All of the extracts showed higher activity against Staphylococcus aureus (methicillin-sensitive and methicillin-resistant) than against Escherichia coli, except one. Among the plants examined, Bursera simaruba (L.) Sarg. (Burseraceae), Haematoxylum brasiletto H. Karst. (Fabaceae), Calophyllum brasiliense Cambess. (Clusiaceae), and Mammea americana L. (Clusiaceae) were highly active against Staphylococcus aureus. Coumarins (mammea A/BA and mammea A/AA) and xanthones, namely jacareubin and 1,3,5,6-tetrahydroxy-2-(3,3-dimethylallyl) xanthone, were isolated as the principle compounds from the last two plants.
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Affiliation(s)
- Kakuko Yasunaka
- Department of Microbiology and Immunology, School of Medicine, Fukuoka University, Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan.
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Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is still one of major problems of drug-resistant microorganisms and healthcare-acquired infections. Methicillin-resistant Staphylococcus aureus is highly prevalent in patients in neonatal intensive care units (NICU) in Japan. The most predominant MRSA in NICU is multidrug resistant and produces superantigenic exotoxin, toxic shock syndrome toxin-1 (TSST-1) and staphylococcal enterotoxin C (SEC). These predominant MRSA strains belong to coagulase type II, SCCmec type II, mecA-Tn554 polymorph type I-A and show closely related pulse field gel electrophoresis types. The dissemination of MRSA is wide, and there is a pandemic distribution of a single MRSA clone in the NICU of Japan. Since 1992, the nationwide spread of this clone has also led to the development of a new neonatal disease known as neonatal toxic shock-like exanthematous disease (NTED), which is caused by overactivation of vbeta2+ T cells induced by TSST-1. The spread of MRSA in NICU in Japan has been attributed to overcrowding, high rates of extremely low birthweight babies, understaffing, low control measures of infection and overuse of antibiotics. The environment of NICU and infection control intervention should be improved and a new strategy for control like vaccination or probiotics is required.
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Affiliation(s)
- Ken Kikuchi
- Department of Infectious Diseases, Tokyo Women's Medical University, Tokyo, Japan.
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Nakano M, Kawano Y, Kawagish M, Hasegawa T, Iinuma Y, Oht M. Two-dimensional analysis of exoproteins of methicillin-resistant Staphylococcus aureus (MRSA) for possible epidemiological applications. Microbiol Immunol 2002; 46:11-22. [PMID: 11911184 DOI: 10.1111/j.1348-0421.2002.tb02671.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We applied two-dimensional gel electrophoresis (2-DE) to the total exoproteins secreted from pathogenic MRSA strains and identified major protein spots by N-terminal amino acid sequence analysis. In approximately 300 to 500 spots visualized on each gel, various exoproteins and cell-associated proteins were identified and their sites on the gels confirmed for construction of a reference map. Major exotoxins such as enterotoxins SEA, SEB, and SEC,, toxic shock syndrome toxin-1 (TSST-1), and hemolysins were distributed in the region of pI 6.8 to 8.1 and MW 21 to 35 kDa. Although the differences between calculated and observed values of pI and MW were relatively small in each exoprotein, those of several proteins including alpha-hemolysin and SEB were considerably deviated from the positions of the expected values. Some exoproteins were detected as multiple spots. These included beta-hemolysin, enterotoxins SEA, SEB, and SEC3, glutamic acid-specific endopeptidase, glycerophosphoryl diester phosphodiesterase and triacylglycerol lipase. The multiple spots of these exoproteins may be generated by the action of own proteases. Certain similarities of 2-DE patterns among strains belonging to the same coagulase types were observed. On the basis of 2-DE image analysis, coagulase type II strains secreted somewhat larger amounts of SEB and SEC3 as well as TSST-1 than the strains belonging to other coagulase types. Taken together, 2-DE analysis of exoproteins is applicable to epidemiological studies for MRSA, as compared with pulsed field gel electrophoresis of restricted chromosomal DNA.
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Affiliation(s)
- Miyo Nakano
- Department of Molecular Bacteriology, Nagoya University Graduate School of Medicine, Aichi, Japan
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Uehara Y, Kikuchi K, Nakamura T, Nakama H, Agematsu K, Kawakami Y, Maruchi N, Totsuka K. H(2)O(2) produced by viridans group streptococci may contribute to inhibition of methicillin-resistant Staphylococcus aureus colonization of oral cavities in newborns. Clin Infect Dis 2001; 32:1408-13. [PMID: 11317240 DOI: 10.1086/320179] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2000] [Revised: 08/28/2000] [Indexed: 11/03/2022] Open
Abstract
In an accompanying report, we showed that viridans group streptococci may prevent methicillin-resistant Staphylococcus aureus (MRSA) colonization of the oral cavities of newborns. In the present study, we investigated the mechanism of prevention in vitro. Most viridans group streptococci had bacteriocin-like activity and killed MRSA, Burkholderia cepacia, Enterobacter aerogenes, and Pseudomonas aeruginosa; however, Escherichia coli, Enterobacter cloacae, and Candida albicans were resistant. The activity was induced only by H(2)O(2)-secreting strains and was inhibited by horseradish peroxidase or catalase in a dose-dependent manner. The mean concentration of H(2)O(2) produced by 18 strains of viridans group streptococci (1 x 10(8) cfu in 200 microL of culture medium+/-standard deviation was 1.24+/-0.60 mmol. Viridans group streptococci inhibited MRSA growth in saliva as well as in culture media. These results indicate that H(2)O(2) produced by viridans group streptococci may inhibit MRSA colonization of oral cavities in newborns.
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Affiliation(s)
- Y Uehara
- Division of Clinical Pathology, Nagano Children's Hospital, Toyoshina, Japan.
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Matsukawa M, Kunishima Y, Takahashi S, Takeyama K, Tsukamoto T. Staphylococcus aureus bacteriuria and surgical site infections by methicillin-resistant Staphylococcus aureus. Int J Antimicrob Agents 2001; 17:327-9, discussion 329-30. [PMID: 11295417 DOI: 10.1016/s0924-8579(00)00358-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Surgical site infection (SSI) remains an important cause of morbidity among hospitalized patients. We reviewed 421 patients who underwent open urological operations between January 1993 and December 1997 in our institute. Group I consisted of 259 patients who received uncontrolled antimicrobial prophylaxis (AMP) between 1993 and 1995. Group II consisted of 162 patients who received controlled AMP between 1996 and 1997. In group II, penicillins or first to second-generation cephalosporins was used and the duration of use for these agents regulated according to the wound class of each operation. The operations with clean wounds showed the lowest rate of SSI in both groups; the operations with contaminated wounds showed the highest rate of SSI (32.0% in group I and 33.3% in group II). There was no significant difference in the total rates of SSI between the two groups (P=0.216). The most frequently isolated bacterial species was methicillin-resistant Staphylococcus aureus (MRSA), isolated in 73.3% of the cases in group I and in 93.3% in group II. There was no significant difference in the incidence of MRSA isolation between the two groups (P=0.114). The controlled AMP could not lower the incidence of MRSA-induced SSIs. In SSI patients, 22.7% of group I and 35.7% in group II, had MRSA bacteriuria before operation. The prohibition of third-generation cephalosporins and shorter duration of AMP did not reduce the incidence of SSI induced by MRSA because MRSA was not the emerging microorganism but rather a resident in the urological ward. On the other hand, the total incidence of SSI did not increase after regulation of AMP. This finding suggests that older antibacterial agents can prevent infection, except those caused by resistant microorganisms such as MRSA. The effective counter-measure for the prevention of MRSA-induced SSI is needed.
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Affiliation(s)
- M Matsukawa
- Department of Urology, Sapporo University School of Medicine, Chuou-ku, S1W16, Sapporo 060-8543, Hokkaido, Japan
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