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排序方式: 共有241条查询结果,搜索用时 31 毫秒
1.
Interactions of phenylalkylamines with human lung membrane and microsome preparation 总被引:1,自引:0,他引:1
J L Moretti R Zini D Morin Y Joulin G Desplanches N Caillat-Vigneron J P Tillement 《Nuclear medicine communications》1987,8(2):115-120
Lipophilic amines are recognized as important tracers for brain imaging. Their pulmonary accumulation was a drawback for optimal concentration in the brain. We used IMP, HIPDM, IP, amphetamine derivatives to determine the relation between structure and accumulation in the lung. The incubation of phenylalkylamines in competition with 3H-Imipramine, for human lung membrane and microsomes was performed and led to the extraction of a competitive constant (KI). The results showed that the compounds can be classified in order of their decreasing affinity: Iodoamphetamine, iodoisopropylamphetamine, dimethyliodophentermine, hydroxyiodobenzyl propane diamine (HIPDM), isopropylamphetamine and amphetamine. Iodine set in the para position of the ring seemed to increase the affinity of phenylalkylamines for the lung. Adjunction of isopropyl or methyl groups to the lateral chain decreased this affinity. 相似文献
2.
E Albengres P Riant M Morel C Hamberger O Tavolaro D Loisance J P Tillement J P Cachera 《Therapeutic drug monitoring》1990,12(1):2-7
The effects of cyclosporin A (CSA) in low dosage (4 mg/kg/24 h i.v.) were studied in 17 patients awaiting heart transplantation. The lymphocyte subsets were typed, enumerated, and their proliferation measured before CSA perfusion, after infusion (over 24 h), and then again after two further 24 h intervals (T0 h, T24 h, T48 h, and T72 h). No significant change was found in T or B enumerations although lymphocyte function was markedly modified. For all 17 patients, there was a significant decrease in lymphocyte proliferation that was, however, re-established after 72 h for 14 of the patients, but not for the remaining 3. Inhibition of the proliferative response was found to occur rapidly, to be potent although rapidly reversible in most cases, while yet subject to wide interindividual variability. These four features suggest that (a) CSA in fixed doses may later the balance between helper and suppressor cells in varying degrees according to the patient, and that (b) CSA given immediately or shortly after heart transplantation could be beneficial. 相似文献
3.
F Brée G Houin J Barré J L Moretti V Wirquin J P Tillement 《Clinical pharmacokinetics》1986,11(4):336-342
The volumes of distribution of many acidic drugs have been shown to be close to that of their binding protein, i.e. serum albumin. The distribution of basic drugs mainly bound to alpha 1-acid glycoprotein (AAG) can be questioned with respect to its dependency upon the distribution of this plasma protein. So, a pharmacokinetic study was performed in 7 subjects with human 125I-labelled alpha 1-acid glycoprotein. The steady-state volume of distribution was found to be 5.37 +/- 0.82L. The central volume was 3.23 +/- 0.33L, close to that of plasma volume and the peripheral volume was 2.14 +/- 0.63L. These data allowed the establishment of an equation giving access to the volume of distribution of a basic drug by relating its unbound fraction to physiological distribution of alpha 1-acid glycoprotein. The values yielded by this equation show that the actual and calculated volumes of distribution of basic drugs mainly bound to AAG are discrepant. This protein is thus not the main factor controlling the distribution of basic drugs within the body. 相似文献
4.
S. Urien D. Morin A. Renouard I. Rocher J.-P. Tillement 《European journal of clinical pharmacology》1988,34(4):381-385
Summary The serum concentrations of 1-acid glycoprotein (AAG), albumin (HSA) and non-esterified fatty acids, and the serum binding of tertatolol were measured in four groups of individuals: healthy control subjects (n=24), and patients with inflammation (n=28), and hepatic (n=20) and renal (n=27) insufficiency.Serum binding of tertatolol was increased in patients with inflammation (94.6%), decreased in patients with hepatic insufficiency (88.8%) and it was unchanged in patients with renal insufficiency (92.8%) as compared to controls (92.7%).Multivariate analysis indicated that the changes were mainly related to concomitant changes in AAG concentration, which could account for 57% of intersubject variability in the bound/free ratio, and to a lesser extent in HSA, which accounted for only 4% of the variability in the binding.The data show that the free fraction of the basic drug tertatolol in serum is affected by pathological conditions that cause changes in AAG concentration. 相似文献
5.
Aziz Elimadi Didier Morin Edith Albengres Anne-Marie Chauvet-Monges Valérie Allain Aimé Crevat Jean-Paul Tillement 《British journal of pharmacology》1997,121(7):1295-1300
- The effects of zidovudine (ZDV) and zidovudine triphosphate (ZDV-3P) on Ca2+-induced mitochondrial permeability transition (MPT), respiratory control ratio (RCR) and ATP synthesis have been investigated on isolated rat liver mitochondria.
- ZDV slightly but significantly decreased RCR and ATP synthesis but was ineffective in inhibiting MPT. In contrast, ZDV-3P did not alter RCR and ATP synthesis but strongly inhibited MPT (IC50=3.0±0.9 μM).
- The effect of ZDV-3P on mitochondrial swelling required a preincubation time. When incubated 10 min with mitochondria, ZDV-3P (8 μM) totally inhibited the rate of swelling.
- ADP, ATP and atractyloside, which are agents known to interact with the mitochondrial adenine nucleotide carrier (ANC), antagonized the effect of ZDV-3P on mitochondrial swelling. Indeed, the IC50 value of ZDV-3P increased from 3.0 to 17.4, 93.6 and 66.5 μM, in the presence of 20 μM, ADP, ATP or atractyloside, respectively.
- ZDV-3P did not displace [3H]-ATP from its mitochondrial binding site(s) whereas ADP and atractyloside did, suggesting that ZDV-3P and [3H]-ATP do not share the same binding sites.
- ZDV-3P did not affect either mitochondrial respiration or ATP synthesis but inhibited Ca2+-dependent mitochondrial swelling. It was concluded that mitochondrial toxic effects observed during the chronic administration of ZDV cannot be related to its active metabolite (ZDV-3P).
6.
Loss of RhoB expression in human lung cancer progression. 总被引:6,自引:0,他引:6
Julien Mazieres Teresita Antonia Ghislaine Daste Carlos Muro-Cacho Delphine Berchery Vanessa Tillement Anne Pradines Said Sebti Gilles Favre 《Clinical cancer research》2004,10(8):2742-2750
PURPOSE: RhoB is a low molecular weight GTPase belonging to the Ras protein superfamily. Whereas most Rho proteins have been shown to have a positive role in proliferation and malignant transformation, the specific role of RhoB appears more divergent. We reported previously that RhoB inhibits cell proliferation in various human cancer cells. Here, we studied the specific role played by RhoB in human lung cancer. EXPERIMENTAL DESIGN: We analyzed the expression of RhoB protein by immunostaining in human lung tissues ranging from normal to invasive carcinoma from different histological types in two large independent studies of, respectively, 94 and 45 samples. We then studied the cellular effect of RhoB overexpression in a model of lung cancer (A549, adenocarcinoma) and tumorigenicity in nude mice. RESULTS: We showed in both studies that RhoB protein was expressed in normal lung and decreased dramatically through lung cancer progression (P < 0.01). Interestingly, RhoB expression was lost in 96% of invasive tumors and reduced by 86% in poorly differentiated tumors compared with the nonneoplastic epithelium. Moreover, the loss of expression of RhoB correlated significantly with tumor stage and proliferative index, whereas no correlation was found between RhoB and p53 or Bcl-2 expression. We then showed that ectopic expression of RhoB in lung cancer cell line A549 suppressed cell proliferation, anchorage-independent growth, and xenograft tumor growth in nude mice. CONCLUSIONS: RhoB loss of expression occurs very frequently in lung carcinogenesis, reinforcing its putative tumor suppressive activity, and raising the value of its potential use in cancer therapy. 相似文献
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9.
Influence of food on the absorption of the p-chlorophenolic ester of chlorophenoxyisobutyric acid in man.
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G Houin R A Shastri J Barre B Pinchon J P Tillement 《British journal of clinical pharmacology》1984,17(3):341-345
A study was designed to investigate the effect of a fatty meal on the absorption of chlorophenoxyisobutyric acid (CPIB) in six healthy adult volunteers after oral administration of the p-chlorophenolic (PCP) ester of CPIB. Plasma concentrations of CPIB when administered with food were higher than those observed in the fasting state. The Cmax in the former case was 24.0 +/- 4.6 mg l-1 as against a value of 15.2 +/- 6.9 mg l-1 in the latter (P less than 0.01). The pharmacokinetic parameters measured were found to be linear with the dose administered. This could be due to low plasma concentrations of CPIB unable to cause a saturation of the plasma protein binding of this drug. It is concluded that a fatty meal enhances the absorption of this hypolipidaemic drug. 相似文献
10.
Mitochondria as target for antiischemic drugs 总被引:5,自引:0,他引:5
The cessation of blood flow followed by a reperfusion period results in severe damages to cell structures. This induces a complex cascade of events involving, more particularly, a loss of energy, an alteration of ionic homeostasis promoting H(+) and Ca(2+) build up and the generation of free radicals. In this context, mitochondria are highly vulnerable and play a predominant role in the cell signaling leading from life to death. This is why, recently, efforts to find an effective therapy for ischemia-reperfusion injury have focused on mitochondria. This review summarizes the pharmacological strategies which are currently developed and the potential mitochondrial targets which could be involved in the protection of cells. 相似文献