Abstract:
:This report shows that N-acylation of the protein kinase C (PKC) substrate Arg-Lys-Arg-Thr-Leu-Arg-Arg-Leu (RKRTLRRL) provides it with a potent inhibitory activity against PKC. N-myristoyl-RKRTLRRL inhibited Ca2(+)- and phosphatidylserine (PS)-dependent histone phosphorylation catalyzed by PKC with a 50% inhibitory concentration (IC50) of 5 microM, whereas neither RKRTLRRL nor myristic acid inhibited PKC-catalyzed histone phosphorylation at concentrations as high as 50 microM. A fully active, Ca2(+)- and PS-independent catalytic fragment of PKC can be generated by limited proteolysis. N-myristoyl-RKRTLRRL inhibited histone phosphorylation catalyzed by the catalytic fragment of PKC (IC50 = 80 microM), but neither myristic acid nor the nonmyristylated peptide inhibited the activity of the catalytic fragment at concentrations up to and including 200 microM. The Km app and Vmax app for N-myristoyl-RKRTLRRL were similar to those of RKRTLRRL. Thus, N-myristylation provided the octapeptide with an inhibitory activity against PKC but had only minor effects on its Km app and Vmax app. Kinetic analysis provided evidence that the peptide inhibited PKC noncompetitively with respect to ATP. Previously, we reported that the protein kinase inhibitor H7 partially reverses Adriamycin resistance in the multidrug resistant (MDR) murine fibrosarcoma line UV-2237M-ADRR. In this report, we show that N-myristoyl-RKRTLRRL also partially reverses Adriamycin resistance in UV-2237M-ADRR cells. These results suggest that potent and selective cell permeable PKC inhibitors may be designed by N-acylating small PKC peptide substrates.
journal_name
Invest New Drugsjournal_title
Investigational new drugsauthors
O'Brian CA,Ward NE,Liskamp RM,de Bont DB,Earnest LE,van Boom JH,Fan Ddoi
10.1007/BF00175084subject
Has Abstractpub_date
1991-05-01 00:00:00pages
169-79issue
2eissn
0167-6997issn
1573-0646journal_volume
9pub_type
杂志文章abstract::The aim of this study was to determine the antitumor activity of irofulven when administered in combination with a variety of antimitotic agents. Irofulven in combination with either paclitaxel or docetaxel demonstrated synergistic activity in both the in vitro and in vivo studies. The majority of xenograft bearing an...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1023/a:1016201807796
更新日期:2002-08-01 00:00:00
abstract::Mezerein, the most active antitumor compound isolated from the daphne species of plants, has a structural similarity to phorbol myristate acetate (PMA), the major active compound isolated from croton oil. PMA is known to have tumor promoting activity and is a potent inflammatory agent. Mezerein has similarly been repo...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/BF00170855
更新日期:1989-07-01 00:00:00
abstract::A phase II trial of gemcitabine (Gemzar), a nucleoside analogue with broad activity in solid tumors, was performed in patients with recurrent or metastatic squamous cell carcinoma of the head and neck. A total of 26 eligible patients were registered to receive a dose of 1250 mg/m2 weekly for 3 weeks, followed by a 1 w...
journal_title:Investigational new drugs
pub_type: 临床试验,杂志文章
doi:10.1023/a:1010657609609
更新日期:2001-01-01 00:00:00
abstract:INTRODUCTION:Multidrug resistance in cancer represents a major problem in chemotherapy. The present study was designed to assess the cytotoxicity of anthraquinones from Pentas schimperi, namely damnacanthal (1), damnacanthol (2), 3-hydroxy-2-hydroxymethyl anthraquinone (3) and schimperiquinone B (4) against nine drug-s...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/s10637-015-0268-9
更新日期:2015-08-01 00:00:00
abstract::Nafazatrom was tested against a variety of human malignancies with the human tumor stem cell assay at one or more of the following concentrations: 1, 10, 25, and 100 micrograms/ml X 1 h or 0.05, 0.5, or 5 micrograms/ml by continuous exposure. Major (greater than or equal to 70%) inhibition was noted in 7/52 adenocarci...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/BF00173781
更新日期:1984-01-01 00:00:00
abstract::Fourteen patients with acute leukemia in relapse were treated with difluoromethylornithine (DFMO) alone or in combination with methylglyoxal-bis(guanylhydrazone) (MGBG) as part of Phase I studies. Five patients included in the trial exhibited morphologic evidence of cellular differentiation during the course of treatm...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/BF00170848
更新日期:1989-07-01 00:00:00
abstract::Background This first-in-human phase 1 study assessed the safety of TAS-114, a novel deoxyuridine triphosphatase inhibitor, combined with S-1 to determine its maximum tolerated dose (MTD) and recommended dose (RD). Methods In this dose-escalation study with a 3 + 3 design, TAS-114 and S-1 were concurrently administere...
journal_title:Investigational new drugs
pub_type: 杂志文章,多中心研究
doi:10.1007/s10637-018-0697-3
更新日期:2019-06-01 00:00:00
abstract::Although immune checkpoint inhibitors have improved the survival of small cell lung cancer (SCLC) patients, their efficacy in SCLC patients who relapsed after systemic chemotherapy is unclear. This retrospective study aimed to investigate the utility of treatment with atezolizumab plus carboplatin and etoposide in SCL...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/s10637-020-00983-6
更新日期:2020-08-11 00:00:00
abstract:PURPOSE:To compare two different infusion schedules of phenylacetate (PA) in patients with primary brain tumors and to assess the feasibility of the administration in a multi-institutional setting. PATIENTS AND METHODS:Adult patients with recurrent primary brain tumors were treated with PA on two different schedules. ...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1023/a:1026299118067
更新日期:2003-11-01 00:00:00
abstract::The study investigated possible mechanisms by which second-generation taxanes, established as significantly more effective than paclitaxel in vitro, suppress a rat lymphoma model in vivo. The studied mechanisms included taxane pharmacokinetics, expression of genes dominating their metabolism (Cyp3a1/2) and transport (...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/s10637-011-9654-0
更新日期:2012-06-01 00:00:00
abstract::Fluorouracil (5-FU) plus irinotecan combined with bevacizumab has significant activity in metastatic colorectal cancer (mCRC), but S-1 has become a substitute for continuous infusion of 5-FU and has a very low incidence of hand-foot syndrome. With the S-1 plus irinotecan regimen (SIR), the response rate was 62.5%, and...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/s10637-011-9743-0
更新日期:2012-08-01 00:00:00
abstract::Hepatocellular carcinoma (HCC) is the most prevalent type of tumor among primary liver tumors and is the second highest cause of cancer-related deaths worldwide. Current therapies are controversial, and more research is needed to identify effective treatments. A new synthetic compound, potassium 5-cyano-4-methyl-6-oxo...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/s10637-020-00941-2
更新日期:2020-12-01 00:00:00
abstract::Androgen receptors are present in both pancreatic cancer tissue and cell lines. Flutamide is a potent antiandrogen widely used in clinical practice for patients with metastatic prostate cancer. This Phase II trial was undertaken to evaluate the impact of flutamide in patients with advanced pancreatic adenocarcinoma wh...
journal_title:Investigational new drugs
pub_type: 临床试验,杂志文章
doi:10.1023/a:1005989519350
更新日期:1997-01-01 00:00:00
abstract::Chemotherapy has always been the first therapeutic option for patients with advanced non-small cell lung cancer (NSCLC) with untreatable oncogenic mutations. However, chemotherapy has demonstrated limited success and is associated with severe side effects. This research aimed to investigate the antitumor efficacy and ...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/s10637-019-00876-3
更新日期:2020-08-01 00:00:00
abstract:PURPOSE:A phase I study of intraperitoneal paclitaxel (ip PTX) combined with gemcitabine (GEM) plus nab-paclitaxel (nab-PTX) (GnP) was conducted to determine the maximum tolerated dose (MTD) and the recommended dose (RD) in pancreatic cancer patients with peritoneal metastasis in first-line setting. METHODS:Based on t...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/s10637-020-00982-7
更新日期:2020-08-08 00:00:00
abstract::XK-469 is advancing to Phase I clinical trials. Preclinical studies were carried out to assist in clinical applications. DOSE-SCHEDULE ROUTE TESTING: Single dose i.v. treatment with XK-469 produced lethality (LD20 to LD100) above 142 mg/kg. Optimum treatment required total dosages of 350 to 600 mg/kg. Furthermore, hig...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1023/a:1014469828729
更新日期:2002-02-01 00:00:00
abstract::We have recently developed a liposomal nanoparticle (LNP) formulation of irinotecan based on loading method that involves formation of a complex between copper and the water soluble camptothecin. The loading methodology developed for irinotecan was evaluated to develop a LNP topotecan formulation (referred to herein a...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/s10637-012-9832-8
更新日期:2013-02-01 00:00:00
abstract::Chaetoglobosin K (ChK) is a natural product that inhibits anchorage-dependent and anchorage-independent growth of ras-transformed cells, prevents tumor-promoter disruption of cell-cell communication, and reduces Akt activation in tumorigenic cells. This study demonstrates how ChK modulates the JNK pathway in ras-trans...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/s10637-012-9883-x
更新日期:2013-06-01 00:00:00
abstract:BACKGROUND:Therapeutic approaches to marginal zone B-cell lymphoma (MZL) continue to evolve. Localized MZL responds favorably to local treatments, including surgery and/or local radiation therapy. However, MZL manifests as a disseminated disease in one-third of the cases at diagnosis. Moreover, relapses involving dista...
journal_title:Investigational new drugs
pub_type: 杂志文章,多中心研究
doi:10.1007/s10637-009-9260-6
更新日期:2010-04-01 00:00:00
abstract:BACKGROUND:To explore the activity of lapatinib with a novel trial design focused on the drug target rather than on histology. METHODS:Patients with HER2 amplified gastro-esophageal, bladder, ovarian, or uterine tumors were enrolled into a double-blinded randomized discontinuation study of lapatinib 1,500 mg PO daily....
journal_title:Investigational new drugs
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1007/s10637-010-9541-0
更新日期:2012-04-01 00:00:00
abstract:BACKGROUND:Gemcitabine is a pro-drug that has to be phosphorylated to gemcitabine-triphosphate in order to exhibit its antineoplastic activity. This reaction involves the enzyme deoxycytidine kinase which is saturated at plasma concentrations following standard 30-min infusions. Pharmacological studies indicate that pr...
journal_title:Investigational new drugs
pub_type: 临床试验,杂志文章
doi:10.1007/s10637-005-5859-4
更新日期:2005-03-01 00:00:00
abstract::Human topoisomerase II (hTopoII) inhibitors are important chemotherapeutic agents in many different settings including treatment of malignant mesothelioma. Topoisomerase poisons, such as etoposide and doxorubicin, function by trapping the DNA-enzyme covalent complex producing DNA strand breaks which can ultimately lea...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/s10637-011-9720-7
更新日期:2012-08-01 00:00:00
abstract::Spirogermanium (NSC 192965) is a new metallic investigational anticancer drug of novel heterocyclic structure. Although its mode of action has not been fully elucidated, it appears that spirogermanium is not a phase or cell cycle specific drug and inhibits DNA, RNA and protein synthesis, the protein synthesis being th...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/BF00208894
更新日期:1983-01-01 00:00:00
abstract::Background PF-06840003 is a highly selective indoleamine 2, 3-dioxygenase (IDO1) inhibitor with antitumor effects in preclinical models. This first-in-human phase 1 study evaluated safety, pharmacokinetics/pharmacodynamics, and preliminary efficacy in recurrent malignant glioma to determine the maximum tolerated dose ...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/s10637-020-00950-1
更新日期:2020-12-01 00:00:00
abstract:INTRODUCTION:Heat shock protein 90 (Hsp90) has been studied as a therapeutic target in many cancers. In preclinical trials, the Hsp90 ATPase inhibitor ganetespib demonstrated potent inhibition of solid tumor growth, with superior potency than prior Hsp90 inhibitors. Given the promising preclinical outcome and favorable...
journal_title:Investigational new drugs
pub_type: 杂志文章,多中心研究
doi:10.1007/s10637-015-0307-6
更新日期:2016-02-01 00:00:00
abstract:PURPOSE:The transcription factor nuclear factor-kB (NFkB) is implicated in gastric cancer carcinogenesis and survival, and its inhibition by proteosome inhibition is associated with preclinical gastric cancer anti-tumor activity. We examined the single agent efficacy of bortezomib, a selective proteasome inhibitor, in ...
journal_title:Investigational new drugs
pub_type: 杂志文章,多中心研究
doi:10.1007/s10637-010-9474-7
更新日期:2011-12-01 00:00:00
abstract::Bcl-2 family proteins are the key regulators of the intrinsic apoptotic pathway, controlling the point-of no-return and setting the threshold to engage the death machinery in response to chemical damage. Bcl-2 proteins have emerged as attractive targets for anti-cancer drug development. Navitoclax is a selective, pote...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/s10637-014-0116-3
更新日期:2014-10-01 00:00:00
abstract:BACKGROUND:ONT-093 is an orally bioavailable inhibitor of P-glycoprotein (P-gp). In pre-clinical studies, ONT-093 could inhibit P-gp and reverse multidrug resistance at nM concentrations with no effect on paclitaxel pharmacokinetics. Phase I trials of ONT-093 in normal human volunteers showed no dose-limiting toxicitie...
journal_title:Investigational new drugs
pub_type: 临床试验,杂志文章
doi:10.1007/s10637-005-1439-x
更新日期:2005-08-01 00:00:00
abstract::Echinomycin is a quinoxaline antibiotic that was originally isolated from Streptomyces echinatus. Based on its antitumor activity against two i.p. implanted murine tumors, the B16 melanoma, and the P388 leukemia, it was brought into clinical trials by the National Cancer Institute. Recent studies on its cytotoxic acti...
journal_title:Investigational new drugs
pub_type: 临床试验,杂志文章,评审
doi:10.1007/BF00170766
更新日期:1985-01-01 00:00:00
abstract::PA-U2, an engineered anthrax protective antigen that is activated by urokinase was combined with wildtype lethal factor in the treatment of Colo205 colon adenocarcinoma in vitro and B16-BL6 mouse melanoma in vitro and in vivo. This therapy was also tested in combination with the small molecule paclitaxel, based on pri...
journal_title:Investigational new drugs
pub_type: 杂志文章
doi:10.1007/s10637-012-9847-1
更新日期:2013-02-01 00:00:00