Effect of temperature on surface properties of cervical tissue homogenate and organic phase monolayers

Preetha, A.; Banerjee, Rinti; Huilgol, Nagraj G

doi:10.1016/j.colsurfb.2007.05.015

Cited by 8 publications

(3 citation statements)

References 22 publications

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“…Previous studies proved when the Chinese hamster ovary cells were heated for 45 min at temperatures above 42°C, plasma membrane fluidity was increased progressively [29] . The fluidity change at hyperthermic range of temperature can be correlated to the increased efficiency of drug on combination therapy with hyperthermia [30] . Our data demonstrated that water submerged hyperthermia at 42°C and 45°C can increase the SGC7901/ADM cells membrane fluidity.…”

Section: Discussionmentioning

confidence: 99%

Synergistic effect of hyperthermia and neferine on reverse multidrug resistance in adriamycin-resistant SGC7901/ADM gastric cancer cells

Huang

Cao

et al. 2011

J. Huazhong Univ. Sci. Technol. [Med. Sci.]

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Multidrug resistance (MDR) plays a major obstacle to successful gastric cancer chemotherapy. The purpose of this study was to investigate the MDR reversal effect and mechanisms of hyperthermia in combination with neferine (Nef) in adriamycin (ADM) resistant human SGC7901/ADM gastric cancer cells. The MDR cells were heated at 42°C and 45°C for 30 min alone or combined with 10 μg/mL Nef. The cytotoxic effect of ADM was evaluated by MTT assay. Cellular plasma membrane lipid fluidity was detected by fluorescence polarization technique. Intracellular accumulation of ADM was monitored with high performance liquid chromatography. Mdr-1 mRNA, P-glycoprotein (P-gp), γH2AX expression and γH2AX foci formation were determined by real-time PCR, Western blot and immunocytochemical staining respectively. It was found that different heating methods induced different cytotoxic effects. Water submerged hyperthermia had the strongest cytotoxicity of ADM and Nef combined with hyperthermia had a synergistic cytotoxicity of ADM in the MDR cells. The water submerged hyperthermia increased the cell membrane fluidity. Both water submerged hyperthermia and Nef increased the intracellular accumulation of ADM. The water submerged hyperthermia and Nef down-regulated the expression of mdr-1 mRNA and P-gp. The water submerged hyperthermia could damage DNA and increase the γH2AX expression of SGC7901/ADM cells. The higher temperature was, the worse effect was. Our results show that combined treatment of hyperthermia with Nef can synergistically reverse MDR in human SGC7901/ADM gastric cancer cells.

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Section: Discussionmentioning

confidence: 99%

Synergistic effect of hyperthermia and neferine on reverse multidrug resistance in adriamycin-resistant SGC7901/ADM gastric cancer cells

Huang

Cao

et al. 2011

J. Huazhong Univ. Sci. Technol. [Med. Sci.]

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“…Interestingly, it has been reported that the cell membranes of several tumor types (lung, cervix and neural cancers, lymphoma, and leukemia) are more fluid than the membranes of normal cells (14)(15)(16)(17)(18)(19). Increased fluidity has also been correlated with poorer prognosis and increased metastasis (17)(18)(19).…”

Section: Insertion Pka and State III Helicity Change Biphasically Witmentioning

confidence: 99%

Membrane physical properties influence transmembrane helix formation

Barrera

Fendos

Engelman

2012

Proc. Natl. Acad. Sci. U.S.A.

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The pHLIP peptide has three states: (I) soluble in aqueous buffer, (II) bound to the bilayer surface at neutral pH, and (III) inserted as a transmembrane (TM) helix at acidic pH. The membrane insertion of pHLIP at low pH can be used to target the acidic tissues characteristic of different diseases, such as cancer. We find that the α-helix content of state II depends on lipid acyl chain length but not cholesterol, suggesting the helicity of the bound state may be controlled by the bilayer elastic bending modulus. Experiments with the P20G variant show the proline residue in pHLIP reduces the α-helix content of both states II and III. We also observe that the membrane insertion pKa is influenced by membrane physical properties, following a biphasic pattern similar to the membrane thickness optima observed for the function of eukaryotic membrane proteins. Because tumor cells exhibit altered membrane fluidity, we suggest this might influence pHLIP tumor targeting. We used a cell insertion assay to determine the pKa in live cells, observing that the properties in liposomes held in the more complex plasma membrane. Our results show that the formation of a TM helix is modulated by both the conformational propensities of the peptide and the physical properties of the bilayer. These results suggest a physical role for helix-membrane interactions in optimizing the function of more complex TM proteins.alpha helix | peptide folding | tumor acidity | bilayer thickness | vesicle properties

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“…Biophysical investigations have shown that lipid composition significantly influences the interaction of drugs or drug delivery systems, and thus their cellular uptake. Preetha et al ,, showed that paclitaxel penetrated much more readily in DPPC monolayers than in monolayers composed of lipid extract from cancerous cervical tissue. Subsequent experiments have provided evidence that this discrepancy is due to the behavior of cholesterol and SM present in the DPPC monolayers and lipid extract from cancerous cervical tissue.…”

Section: Introductionmentioning

confidence: 99%

Biophysical Interactions with Model Lipid Membranes: Applications in Drug Discovery and Drug Delivery

2009

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The transport of drugs or drug delivery systems across the cell membrane is a complex biological process, often difficult to understand because of its dynamic nature. In this regard, model lipid membranes, which mimic many aspects of cell-membrane lipids, have been very useful in helping investigators to discern the roles of lipids in cellular interactions. One can use drug-lipid interactions to predict pharmacokinetic properties of drugs, such as their transport, biodistribution, accumulation, and hence efficacy. These interactions can also be used to study the mechanisms of transport, based on the structure and hydrophilicity/hydrophobicity of drug molecules. In recent years, model lipid membranes have also been explored to understand their mechanisms of interactions with peptides, polymers, and nanocarriers. These interaction studies can be used to design and develop efficient drug delivery systems. Changes in the lipid composition of cells and tissue in certain disease conditions may alter biophysical interactions, which could be explored to develop target-specific drugs and drug delivery systems. In this review, we discuss different model membranes, drug-lipid interactions and their significance, studies of model membrane interactions with nanocarriers, and how biophysical interaction studies with lipid model membranes could play an important role in drug discovery and drug delivery.

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Effect of temperature on surface properties of cervical tissue homogenate and organic phase monolayers

Cited by 8 publications

References 22 publications

Synergistic effect of hyperthermia and neferine on reverse multidrug resistance in adriamycin-resistant SGC7901/ADM gastric cancer cells

Synergistic effect of hyperthermia and neferine on reverse multidrug resistance in adriamycin-resistant SGC7901/ADM gastric cancer cells

Membrane physical properties influence transmembrane helix formation

Biophysical Interactions with Model Lipid Membranes: Applications in Drug Discovery and Drug Delivery

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