scholarly journals Gene Amplification of the Multidrug Resistance 1 Gene of Plasmodium vivax Isolates from Thailand, Laos, and Myanmar

2008 ◽  
Vol 52 (7) ◽  
pp. 2657-2659 ◽  
Author(s):  
Mallika Imwong ◽  
Sasithon Pukrittayakamee ◽  
Wirichada Pongtavornpinyo ◽  
Supatchara Nakeesathit ◽  
Shalini Nair ◽  
...  
Keyword(s):  
Multidrug Resistance ◽  
Southeast Asia ◽  
Plasmodium Vivax ◽  
Real Time ◽  
Gene Amplification ◽  
Real Time Pcr ◽  
Multidrug Resistance 1 Gene

ABSTRACT Plasmodium vivax mdr1 gene amplification, quantified by real-time PCR, was significantly more common on the western Thailand border (6 of 66 samples), where mefloquine pressure has been intense, than elsewhere in southeast Asia (3 of 149; P = 0.02). Five coding mutations in pvmdr1, independent of gene amplification, were also found.

Multidrug resistance in chronic lymphocytic leukemia

2008 ◽  
Vol 149 (4) ◽  
pp. 161-167 ◽  
Author(s):  
Tamás Szendrei ◽  
Tamás Magyarlaki ◽  
Gábor Kovács ◽  
Ágnes Nagy ◽  
Árpád Szomor ◽  
...  
Keyword(s):  
Multidrug Resistance ◽  
Chronic Lymphocytic Leukemia ◽  
Real Time ◽  
Real Time Pcr ◽  
Lymphocytic Leukemia ◽  
Light Cycler ◽  
Mdr 1

Az utóbbi években krónikus lymphoid leukaemiában új prognosztikai faktorok vizsgálata került a figyelem középpontjába. A citogenetikai eltérések, az immunglobulin-nehézlánc génmutációs státusza, a CD38- és ZAP70-expresszió mind a közelmúltban megismert prognosztikus faktorok, de kevés az adat a multidrog-rezisztencia jelentőségéről. Célok: A tanulmány célja genetikai, expressziós és funkcionális szinten jellemezni 82 krónikus lymphoid leukaemiában szenvedő beteg multidrog-rezisztenciájának sajátosságait, és vizsgálni azok összefüggését a betegek túlélésével és a kezelésre adott válasszal. Módszerek: a szerzők 66 betegnél vizsgálták az MDR-1 gén ben – Light Cycler Real Time PCR segítségével meghatározott – „Single Nucleotid Polymorphism” sajátosságot, amely irodalmi adatok szerint a P-glikoprotein expresszióját befolyásolja. Összesen 82 betegnél áramlási citometria során anti-P-glikoprotein monoklonális antitest segítségével a P-glikoprotein- expresszió t, az ún. calcein-verapamil teszttel pedig a multidrog-rezisztencia funkcióját vizsgálták. A kezelésre adott választ 35 betegnél vizsgálták, a statisztikai elemzésnél Fischer-tesztet alkalmazva. A túlélési analízist a teljes beteganyagon elvégezték ( n = 82, Log-rank-teszt). Eredmények: Az irodalmi adatokkal ellentétben a szerzők nem találtak korrelációt a vizsgált három multidrogrezisztencia-teszt között. A kezelésre adott választ vizsgálva 35 kezelt betegből 13 nonrespondernek, 22 pedig respondernek bizonyult. A P-glikoprotein-pozitív fenotípusú esetek ( n = 9) 89%-ban klinikailag nonrespondernek bizonyultak (9 P-glikoprotein-pozitív krónikus lymphoid leukaemiás beteg közül 8 nonresponder volt), a P-glikoprotein-negatív esetek ( n = 26) pedig 80%-ban jó terápiás választ mutattak (26 P-glikoprotein-negatív beteg közül 21 responder) ( p < 0,001). Az átlagos várható túlélésben is jelentős, bár nem szignifikáns ( p = 0,106) különbséget észleltek (84 vs 203 hónap). Következtetések: A vizsgált három laboratóriumi paraméter közül a P-glikoprotein sejtfelszíni jelenléte a leginkább releváns adat krónikus lymphoid leukaemiában a kemorezisztencia előjelzésére és a túléléssel kapcsolatban is prognosztikai faktorként értékelhető.

The prognostic impact of EGFR, ErbB2 and MET gene amplification in human gastric carcinomas as measured by quantitative Real-Time PCR

2015 ◽  
Vol 141 (11) ◽  
pp. 1945-1952 ◽  
Author(s):  
Ghasem Janbabai ◽  
Ziaeddin Oladi ◽  
Touraj Farazmandfar ◽  
Tarang Taghvaei ◽  
Farshad Naghshvar
Keyword(s):  
Real Time ◽  
Gene Amplification ◽  
Real Time Pcr ◽  
Prognostic Impact ◽  
Quantitative Real Time Pcr ◽  
Gastric Carcinomas

scholarly journals The multidrug resistance can be reversed for the decrease of P-gp and LRP by inhibiting PI3K/Akt/NF-κB signal pathway in nasopharynx carcinoma

2020 ◽  
Vol 40 (5) ◽  
Author(s):  
Jin Liu ◽  
Mingyi Zhu ◽  
Yun Feng ◽  
Qianli Tang ◽  
Meng Xu
Keyword(s):  
Multidrug Resistance ◽  
Nasopharyngeal Carcinoma ◽  
Western Blot ◽  
Real Time ◽  
Real Time Pcr ◽  
Carcinoma Cell ◽  
Signal Pathway ◽  
Nasopharyngeal Carcinoma Cell ◽  
Cellular Signal ◽  
The Relationship

Abstract Aim: To investigate the relationship between PI3K/Akt/NF-κB cellular signal pathway and the expression of P-gp and LRP in multidrug resistance (MDR) cell of nasopharyngeal carcinoma. Method: The PI3K, p-Akt and NF-κB/p65 as the activity of PI3K/Akt/NF-κB were detected by Western blot. The expressions of LRP and P-gp were detected by Western blot and real-time PCR. Result: The RIs of CNE/DDP group to DDP, 5-Fu, VCR, ADR and PTX were 35.04, 18.14, 24.13, 12.00 and 10.18, respectively. The RIs of LY-294002 group were 11.77, 5.83, 3.07, 3.86 and 3.34, and PDTC group were 11.08, 6.55, 7.66, 2.18 and 4.05. The expressions of PI3K, p-Akt and NF-κBp65, LRP and P-gp were increased and mRNA of LRP and P-gp were up-regulated in CNE/DDP. The expression of p-Akt in LY-294002 group was down-regulated. The expression of NF-κB p65 in PDTC group was decreased. The mRNA of LRP and P-gp in LY-294002 group and PDTC group were decreased. Conclusion: MDR of nasopharyngeal carcinoma cell can be regulated by activating PI3K/Akt/NF-κB signal pathway and then increase the expression of P-gp and LRP. The MDR of nasopharyngeal carcinoma cell can be reversed by inhibiting PI3K/Akt/NF-κB signal pathway.

scholarly journals Molecular surveillance of the Plasmodium vivax multidrug resistance 1 gene in Peru between 2006 and 2015

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Fredy E. Villena ◽  
Jorge L. Maguiña ◽  
Meddly L. Santolalla ◽  
Edwar Pozo ◽  
Carola J. Salas ◽  
...  
Keyword(s):  
Drug Resistance ◽  
Multidrug Resistance ◽  
Plasmodium Vivax ◽  
Amazon Basin ◽  
North Coast ◽  
Molecular Surveillance ◽  
Synonymous Mutations ◽  
The North ◽  
Multidrug Resistance 1 Gene

Abstract Background The high incidence of Plasmodium vivax infections associated with clinical severity and the emergence of chloroquine (CQ) resistance has posed a challenge to control efforts aimed at eliminating this disease. Despite conflicting evidence regarding the role of mutations of P. vivax multidrug resistance 1 gene (pvmdr1) in drug resistance, this gene can be a tool for molecular surveillance due to its variability and spatial patterns. Methods Blood samples were collected from studies conducted between 2006 and 2015 in the Northern and Southern Amazon Basin and the North Coast of Peru. Thick and thin blood smears were prepared for malaria diagnosis by microscopy and PCR was performed for detection of P. vivax monoinfections. The pvmdr1 gene was subsequently sequenced and the genetic data was used for haplotype and diversity analysis. Results A total of 550 positive P. vivax samples were sequenced; 445 from the Northern Amazon Basin, 48 from the Southern Amazon Basin and 57 from the North Coast. Eight non-synonymous mutations and three synonymous mutations were analysed in 4,395 bp of pvmdr1. Amino acid changes at positions 976F and 1076L were detected in the Northern Amazon Basin (12.8%) and the Southern Amazon Basin (4.2%) with fluctuations in the prevalence of both mutations in the Northern Amazon Basin during the course of the study that seemed to correspond with a malaria control programme implemented in the region. A total of 13 pvmdr1 haplotypes with non-synonymous mutations were estimated in Peru and an overall nucleotide diversity of π = 0.00054. The Northern Amazon Basin was the most diverse region (π = 0.00055) followed by the Southern Amazon and the North Coast (π = 0.00035 and π = 0.00014, respectively). Conclusion This study showed a high variability in the frequencies of the 976F and 1076L polymorphisms in the Northern Amazon Basin between 2006 and 2015. The low and heterogeneous diversity of pvmdr1 found in this study underscores the need for additional research that can elucidate the role of this gene on P. vivax drug resistance as well as in vitro and clinical data that can clarify the extend of CQ resistance in Peru.

A novel real-time PCR assay for the detection of Plasmodium falciparum and Plasmodium vivax malaria in low parasitized individuals

Acta Tropica ◽  
2011 ◽  
Vol 120 (1-2) ◽  
pp. 40-45 ◽  
Author(s):  
Seung-Young Hwang ◽  
So-Hee Kim ◽  
Ga-Young Lee ◽  
Vu Thi Thu Hang ◽  
Chi-Sook Moon ◽  
...  
Keyword(s):  
Plasmodium Falciparum ◽  
Plasmodium Vivax ◽  
Real Time ◽  
Real Time Pcr ◽  
Vivax Malaria ◽  
Pcr Assay ◽  
Plasmodium Vivax Malaria
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