Abstract：
:We have investigated the role of protein kinase C (PKC) in the multidrug resistance (MDR) phenotype of human KB carcinoma cell lines. The PKC activator 12-O-tetradecanoylphorbol-13-acetate (TPA) reduced daunomycin accumulation in both drug-sensitive KB-3-1 and MDR KB-C1 cells in a time-dependent manner. The inactive phorbol ester 4 alpha TPA did not reduce daunomycin accumulation, and the PKC inhibitor, Ro 31-8220, reversed the TPA effect. TPA had no effect on daunomycin efflux and did not induce Pgp expression in KB-3-1 cells or alter Pgp levels in KB-C1 cells. Linear, short-term daunomycin accumulation was reduced by pretreatment with TPA, an effect that could be reversed by Ro 31-8220. The effects of TPA on PKC subspecies localisation and downregulation were also examined. TPA initially induced translocation of PKCs alpha and delta, and to a lesser extent, PKC epsilon to the membrane fraction; 8 h after TPA treatment, differential effects on downregulation of PKCs alpha and delta were observed between cell lines, although PKC epsilon was not reduced in either cell line. We therefore propose that the TPA-induced reduction in daunomycin accumulation in KB cells is due to a PKC-mediated process, which is maintained after depletion of certain PKC subspecies or is due to activation of downregulation insensitive PKC subspecies. These results suggest that PKC may regulate drug resistance by reducing drug influx in a Pgp-independent manner in KB cells. This may represent a mechanism of drug-resistance independent of, or in addition, to, Pgp-mediated drug efflux.
journal_name
Oncol Resjournal_title
Oncology researchauthors
Drew L,Groome N,Warr JR,Rumsby MGsubject
Has Abstractpub_date
1996-01-01 00:00:00pages
249-57issue
6eissn
0965-0407issn
1555-3906journal_volume
8pub_type
杂志文章abstract：:Human papillomavirus type 16 (HPV16) is a major causative factor in the development of uterine cervical carcinomas. We investigated the role of E6/E7 in tumor formation. Skin-specific E6/E7 transgenic mice showed approximately twice as many tumors compared with nontransgenic mice in dimethylbenz[a]anthracene (DMBA)-in...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/000000006783980964
更新日期：2007-01-01 00:00:00
abstract：:Aclacinomycin (ACR) is an anthracycline anticancer drug that shows marked effects in Adriamycin (ADM)-resistant tumors. ADM, however, is not effective against ACR-resistant tumor cells. When tumor cells acquire resistance to ACR, though the resistance is not easily acquired, they show strong cross-resistance to ADM. T...
journal_title：Oncology research
pub_type： 杂志文章
doi：
更新日期：1995-01-01 00:00:00
abstract：:Kiss-1 has been identified as a putative metastasis suppressor gene in various human malignancies. However, there is little information about its possible role in gastric carcinoma. In this study, we determined whether the Kiss-1 gene negatively regulates MMP-9 expression. cDNA microarray technology was used to identi...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504009789954591
更新日期：2009-01-01 00:00:00
abstract：:Transforming growth factor-β1 (TGF-β1)-induced epithelial-mesenchymal transition (EMT) of non-small cell lung cancer (NSCLC) may contribute to tumor metastasis. TGF-β1-induced EMT in H1975 cells (a human NSCLC cell line) resulted in the adoption of mesenchymal responses that were predominantly mediated via the TGF-β1-...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504017X15051723858706
更新日期：2019-05-07 00:00:00
abstract：:Epithelial ovarian cancer (EOC) has remained an enigmatic disease, the etiology of which is mostly unknown. Considering the age incidence around menopause, a "gonadotrophin theory" has been proposed, and considering the association with infertility, an "incessant ovulation" theory has been proposed. EOC originates fro...
journal_title：Oncology research
pub_type： 杂志文章,评审
doi：10.3727/096504008786111383
更新日期：2008-01-01 00:00:00
abstract：:Triptorelin, a kind of GnRH agonist, is widely used in the treatment of hormone-responsive cancers in the clinic. This study aimed to discover the underlying mechanism of triptorelin in protection from 5-fluorouracil (5-FU)-induced ovarian damage in Sprague-Dawley rats. In the present study, after using 5-FU to induce...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504015X14410238486720
更新日期：2014-01-01 00:00:00
abstract：:The expression of survivin molecules has been confirmed in many types of cancer cells, including colon cancer cells, and they are considered important antiapoptotic molecules. Recent studies have revealed the existence of different splicing forms of survivin molecules; however, no studies have examined their expressio...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504010x12767359113848
更新日期：2010-01-01 00:00:00
abstract：:Progestin and adipoQ receptor family member III (PAQR3), a member of the PAQR family, is frequently downregulated in different types of human cancer. However, its expression and functions in esophageal cancer are still unknown. This study aimed to explore the expression of PAQR3 in esophageal cancer cell lines and to ...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504016X14761384026719
更新日期：2017-05-24 00:00:00
abstract：:Aberrant expression of microRNA-92a (miR-92a) has been investigated in various cancers. However, the function and mechanism of miR-92a in acute myeloid leukemia (AML) remain to be elucidated. Our data showed that miR-92a was evidently downregulated and methylenetetrahydrofolate dehydrogenase 2 (MTHFD2) was remarkably ...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504016X14829256525028
更新日期：2017-08-07 00:00:00
abstract：:Whether the phenotypes of drug resistance and metastatic activity in cancer are dependent on each other or not is controversial. We compared in vitro invasive properties of human hepatoma cells resistant to epirubicin and rich in P-glycoprotein (Pgp) (HB8065/R) with the parental epirubicin-sensitive, Pgp-poor cells (H...
journal_title：Oncology research
pub_type： 杂志文章
doi：
更新日期：1998-01-01 00:00:00
abstract：:Expression of sphingosine kinase 1 (SPHK1) plays a role in colorectal cancer progression. This study aimed to demonstrate the mechanism of human colorectal cancer cell metastatic phenotype through SPHK1 knockdown. Human colorectal cancer HT-29 cells were stimulated by phorbol 12-myristate 13-acetate (PMA) with or with...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504012x13342463747450
更新日期：2011-01-01 00:00:00
abstract：:Point mutations and deletions in the p53 tumor suppressor gene occur frequently in advanced stage bladder tumors. To extend these observations to an in vitro model of bladder tumorigenicity, we have evaluated the presence of p53 mutations in a panel of bladder carcinoma cell lines. p53 alleles were cloned using the re...
journal_title：Oncology research
pub_type： 杂志文章
doi：
更新日期：1994-01-01 00:00:00
abstract：:MicroRNAs (miRNAs) are emerging as pivotal regulators in the development and progression of various cancers, including renal cell carcinoma (RCC). MicroRNA-384 (miR-384) has been found to be an important cancer-related miRNA in several types of cancers. However, the role of miR-384 in RCC remains unclear. In this stud...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504017X15035025554553
更新日期：2018-04-10 00:00:00
abstract：:Accumulated studies have strongly implicated aberrantly expressed microRNAs (miRNAs) in carcinogenesis and cancer progression of various cancers, including colorectal cancer (CRC). Hence, a comprehensive study of miRNAs and their association with CRC may be a promising therapeutic method for patients with this maligna...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504018X15188747585738
更新日期：2018-10-17 00:00:00
abstract：:Phytochemicals present in tea, particularly polyphenols, have anticancer properties against several cancer types. However, studies elucidating the role and the mechanism(s) of action of tea polyphenols in cervical cancer are sparse. In this study, we investigated the mechanism of antiproliferative and apoptotic action...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504011x13021877989711
更新日期：2011-01-01 00:00:00
abstract：:The human nucleolar protein p120 is highly expressed in human cancers. Its high expression in breast cancer correlates with a poor prognosis, and its overexpression in 3T3 mouse fibroblasts causes malignant transformation. This study reports that a combination of monoclonal anti-p 120 antibody (MAbp120), liposomes (Li...
journal_title：Oncology research
pub_type： 杂志文章
doi：
更新日期：1996-01-01 00:00:00
abstract：:Combretastatin A4 phosphate (CA4P) is currently undergoing clinical trials as a tumor vascular-targeting agent. Here, we defined the antivascular effect and programmed cell death (PCD) induced by CA4P in vascular endothelial cells. CA4P induced time- and dose-dependent antiproliferative activities against human umbili...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504011x13079697132790
更新日期：2011-01-01 00:00:00
abstract：:PPAR-gamma is known to have a growth-suppressive effect in different cancers. In this study, we investigated the role of PPAR-gamma in the development of Barrett's esophagus (BE) and esophageal adenocarcinoma (EA). We used immunohistochemistry and real-time PCR to analyze differences in PPAR-gamma protein and mRNA exp...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504011x12935427587849
更新日期：2011-01-01 00:00:00
abstract：:Ubiquitin-specific protease 22 (USP22), a novel deubiquitinating enzyme, belongs to an extended family of proteins that have ubiquitin hydrolase activity. Recently, USP22 has attracted widespread attention because of its implication in carcinogenesis. However, there have been no studies, to our knowledge, investigatin...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504016X14772395226335
更新日期：2017-05-24 00:00:00
abstract：:The present study evaluated the modulatory effects of zinc on colonic membrane fluidity and surface abnormalities following 1,2 dimethylhydrazine (DMH)-induced colon carcinogenesis. Rats were segregated into four groups: normal control, DMH treated, zinc treated, DMH + zinc treated. Colon carcinogenesis was initiated ...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504009789745665
更新日期：2009-01-01 00:00:00
abstract：:To enhance the anticancer efficacy of gemcitabine in the treatment of non-small cell lung cancer (NSCLC), the potential synergistic effect of piceatannol on gemcitabine cytotoxicity was investigated in the human NSCLC A459 cell line. The MTT cell viability assay showed that piceatannol significantly enhanced the cytot...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504015X14386062091398
更新日期：2014-01-01 00:00:00
abstract：:The present study aimed to investigate the effect of miR-186 on proliferation, migration, invasion, and epithelialmesenchymal transition (EMT) of hepatocellular carcinoma (HCC). In this work, miR-186 was downregulated in HCC tissues and cells, and low miR-186 level helped predict the occurrence of vascular invasion an...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504020X15954139263808
更新日期：2020-12-10 00:00:00
abstract：:Medroxyprogesterone (MPA) is used for the conservative treatment of endometrial cancer. Unfortunately, progesterone resistance seriously affects its therapeutic effect. The purpose of the current study was to investigate the influence of deletion of AT-rich interactive domain 1A (ARID1A) in progesterone resistance in ...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504019X15561873320465
更新日期：2019-09-23 00:00:00
abstract：:The melanin biosynthetic pathway from tyrosine is a potential target for combating malignant melanoma. N-Acetyl-4-S-cysteaminylphenol 1 is a previously synthesized analogue of tyrosine that probably acts by this pathway. It interferes with cell growth and proliferation via selective oxidation in melanocytes to an oqui...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/000000006783981206
更新日期：2006-01-01 00:00:00
abstract：:This commentary proposes the working hypothesis that transforming growth factor-beta (TGF-beta) can play two different and opposite roles with respect to the process of malignant progression. During the earliest stages of carcinogenesis, TGF-beta can act as potent tumor suppressor and may mediate the actions of chemop...
journal_title：Oncology research
pub_type： 杂志文章,评审
doi：
更新日期：1997-01-01 00:00:00
abstract：:Adaptive changes occurring in C1300 murine neuroblastoma cell lines developed for resistance to nucleoside analogue inhibitors of S-adenosyl-L-homocysteine hydrolase (AdoHcyase, EC 3.3.1.1) were investigated. Two drug-resistant cell lines, rMNB-MDL-7-2 and rMNB-Deaz-7-2, were established from wild-type C1300 neuroblas...
journal_title：Oncology research
pub_type： 杂志文章
doi：
更新日期：1995-01-01 00:00:00
abstract：:Pancreatic cancer (PC) is a devastating malignant disease with a poor prognosis. This study aimed to investigate the role of urothelial carcinoma associated 1 (UCA1) in the progression of PC. Our results revealed that long noncoding RNA (lncRNA) UCA1 was overexpressed in PC tissues compared with adjacent histologicall...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504017X14888987683152
更新日期：2017-11-02 00:00:00
abstract：:Drug resistance is the major obstacle for the successful therapy of lung adenocarcinoma. It was suggested that ß-elemene, a major isoform of elemene, could reverse the drug resistance in lung cancer cells. However, the underlying mechanisms remains poorly known. Here, we aimed to investigate whether elemene is involve...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504017X14954936991990
更新日期：2017-05-23 00:00:00
abstract：:We investigated the susceptibility of three inbred strains of rats to the hepatocarcinogen, N-nitrosomorpholine (NNM), to establish a spontaneous metastatic model of hepatocellular carcinoma (HCC). WS/Shi. SD/gShi, and F344/DuCrj rats were given 0.02% NNM in drinking water for 8 weeks and thereafter left without any t...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504001108747594
更新日期：2000-01-01 00:00:00
abstract：:To investigate the effect of Kim-1 on 786-0 cells in vivo and in vitro, several experiments such as quantitative real-time PCR, Western blot, MTT, colony formation, and flow cytometry were performed to evaluate the biological behavior of 786-0 cells treated with Kim-1 siRNA. Furthermore, the tumor xenograft model was ...
journal_title：Oncology research
pub_type： 杂志文章
doi：10.3727/096504017X15140544654946
更新日期：2018-08-23 00:00:00
