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Pagina 1 a partire dal 214 risultati
Susceptibility of In Vitro Melanoma Skin Cancer to Photoactivated Hypericin versus Aluminium(III) Phthalocyanine Chloride Tetrasulphonate.
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The sensitivity of human melanoma cells to photoactivated Hypericin (Hyp) compared to aluminium(III) phthalocyanine chloride tetrasulphonate (AlPcS4Cl) is reported in this study. Melanoma cells (A375 cell line) were treated with various concentrations of Hyp or AlPcS4Cl alone, for 1, 4, and 24 hrs;
Hypericin photosensitization of tumor and metastatic cell lines of human prostate.
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We have investigated the photoactivating effect of hypericin on two cancer cell lines: PC-3, a prostatic adenocarcinoma non-responsive to androgen therapy and LNCaP, a lymphonodal metastasis of prostate carcinoma responsive to androgen therapy. The two cell lines are incubated for 24 h with
Photodynamic therapy efficacy and tissue distribution of hypericin in a mouse P388 lymphoma tumor model.
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The phototherapeutic properties and tissue distribution of hypericin were investigated in DBA/2 mice bearing subcutaneously transplanted P388 lymphoma cells. The efficacy of the photodynamic therapy (PDT) 2 h after administration of hypericin (2, 5, or 20 mg/kg, i.p., 120 J/cm2, 595 nm) was
Inhibiting ABCG2 could potentially enhance the efficacy of hypericin-mediated photodynamic therapy in spheroidal cell models of colorectal cancer.
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BACKGROUND
Photodynamic Therapy (PDT) is an attractive modality for treating solid cancers. This study evaluates the efficacy of Hypericin-PDT as a cytotoxic therapy in colorectal cancer (CRC), using 2D cell cultures and 3D multicellular tumour spheroids.
METHODS
Spheroids were generated through
In vitro photodynamic therapy in pediatric epithelial liver tumors promoted by hypericin.
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Limited treatment results in advanced pediatric liver tumors have emphasised the need for alternative treatment approaches in these malignancies. Photodynamic therapy (PDT) has been proposed as promising treatment approach in various malignancies. Hypericin, a naturally occurring substance found in
Exploration of the mechanism underlying the tumor necrosis avidity of hypericin.
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Hypericin, a potent necrosis avid agent, features a peculiar affinity for necrotic tissue. Necrosis avid contrast agents have been investigated as markers for non-invasive imaging of different disorders. In view of the promising clinical applications, a more complete knowledge of the mechanism of
Hypericin as a marker for determination of tissue viability after intratumoral ethanol injection in a murine liver tumor model.
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OBJECTIVE
In this preclinical proof-of-principle study, the necrosis avid agent hypericin was investigated as a potential early indicator for therapeutic response after ethanol-mediated chemical ablation in murine liver tumors.
METHODS
Seven mice bearing intrahepatic radiation-induced fibrosarcoma-1
Expression of Y-Box binding protein-1 following hypericin-mediated photodynamic therapy in well-differentiated nasopharyngeal cancer in vivo.
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The Y-Box binding protein, YB-1, belongs to a group in the DNA and RNA binding protein family. YB-1 is known to be expressed in a number of different cancers and reported to protect cells against DNA-damaging agents such as ultraviolet light. The purpose of this study was to determine if YB-1 levels
Influence of the vascular damaging agents DMXAA and ZD6126 on hypericin distribution and accumulation in RIF-1 tumors.
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OBJECTIVE
We investigated the influence of two types of vascular damaging agents (VDAs) (DMXAA vs. ZD6126) and sequence of administration (VDA 24 h before HYP vs. HYP 1 h before VDA) to evaluate the effect on hypericin (HYP) accumulation and distribution in necrotic tumors.
METHODS
Frozen sections
New frontier in hypericin-mediated diagnosis of cancer with current optical technologies.
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Photosensitizers (PSs) have shown great potentials as molecular contrast agents in photodynamic diagnosis (PDD) of cancer. While the diagnostic values of PSs have been proven previously, little efforts have been put into developing optical imaging and diagnostic algorithms. In this article, we
A Model In Vitro Study Using Hypericin: Tumor-Versus Necrosis-Targeting Property and Possible Mechanisms.
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Hypericin (Hyp) had been explored as a tumor-seeking agent for years; however, more recent studies showed its necrosis-avidity rather than cancer-seeking property. To further look into this discrepancy, we conducted an in vitro study on Hyp retention in vital and dead cancerous HepG2 and normal LO2
Bio-distribution and subcellular localization of Hypericin and its role in PDT induced apoptosis in cancer cells.
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The development of new-generation photosensitizers to improve photodynamic therapy (PDT) and photodynamic diagnosis (PDD) is an area of extensive research. One such compound that has been studied in our group is Hypericin (HY). To study the mechanism of action we have investigated uptake,
Superiority of N-methyl pyrrolidone over albumin with hypericin for fluorescence diagnosis of human bladder cancer cells implanted in the chick chorioallantoic membrane model.
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Formulations of hypericin (HY) with plasma protein have been conventionally used, but to date, no alternative pharmaceutical formulation has been developed for clinical use. Previously, it was reported that formulation of HY containing a biocompatible solvent and penetration enhancer, N-methyl
Hypericin: a new laser phototargeting agent for human cancer cells.
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Laser activation of anthracycline-related drugs combines chemotherapy with photoablation for improved treatment. Hypericin, a structurally related anthraquinone, was tested for laser activation and cytotoxicity in human cancer cells. Viability of P3 squamous cell carcinoma cells incubated with 1 to
Pretargeting of necrotic tumors with biotinylated hypericin using 123I-labeled avidin: evaluation of a two-step strategy.
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As an alternative to directly targeting of necrotic tissue using hypericin, we synthesized a conjugate of hypericin to biotin for use in a pretargeting approach. With this conjugate, we explored the possibility of a two-step pretargeting strategy using (123)I-labeled avidin as effector molecule
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