OBJECTIVETo evaluate the tumor cell-killing effect of photodynamic therapy against human esophageal cancer cells in vitro and identify the main factors affecting the effect.

METHODSHuman esophageal cancer Eca-109 cells were incubated for 24 h in vitro with hematoporphyrin derivative (HpD) and Photofrin at different concentrations prior to exposure to a light energy density of 15 J/cm(2) delivered from a DIOMED 630 PDT system. The cell killing effect was also evaluated for different HpD concentrations combined with 3 light energy densities (10, 30, and 50 J/cm(2)), respectively. The cell survival rate was measured using MTT assay, and fluorescence spectrometry was used to detect the intracellular photosensitizer fluorescence of the tumor cells after incubation with HpD for 4 h.

RESULTSThe cell survival rate after incubation with the two photosensitizers at different concentrations were significantly different, and under the 3 different light energy densities, incubation of the cells with different HpD concentrations also resulted in significantly different cell survival rates (P<0.05). At the 4 low photosensitizer concentrations and with different light energy densities, the cell survival rates were similar (P>0.05), but the 4 higher photosensitizer concentrations resulted in significant difference in the cells survival (P<0.05). Correlation analysis showed that the intracellular photosensitizer concentration was positively correlated to the photosensitizer concentrations in cell incubation (r=0.997).

CONCLUSIONWhen the light source remains constant, the light energy density, the kinds of photosensitizers and their concentrations are the main factors affecting the Eca-109 cell-killing effect of PDT.

Cell Line, Tumor ; Cell Survival ; Dihematoporphyrin Ether ; pharmacology ; Esophageal Neoplasms ; drug therapy ; Hematoporphyrin Derivative ; pharmacology ; Hematoporphyrin Photoradiation ; Humans ; Light ; Photosensitizing Agents ; pharmacology

Cancer, as a serious threat to human health, is one of the major killers. The treatment of cancer has attracted more and more attention. Currently, the means of treating cancer is also increasing, but there is no emergence of a fully satisfactory treatment. A combination of sonodynamic therapy (SDT) and photodynamic therapy (PDT), named sono-photodynamic therapy (S-PDT), is a new composite cancer therapy. Because the therapy can significantly improve the tumor curing effect, it has good application prospects in cancer prevention and treatment. The present article reviewed the progress of the anti-tumor mechanisms and influencing factors of S-PDT.
Animals ; Antineoplastic Agents ; administration & dosage ; Combined Modality Therapy ; Hematoporphyrin Derivative ; administration & dosage ; Hematoporphyrin Photoradiation ; Humans ; Neoplasms ; drug therapy ; therapy ; Photochemotherapy ; methods ; Photosensitizing Agents ; administration & dosage ; Ultrasonic Therapy ; methods

While photodynamic therapy is applied on neoplasm, photosensitisers tend to accumulate in neoplastic tissues. With appropriate wavelength light, it causes photochemical reaction and destructs neoplastic tissues. Its better selection for tumor tissue with effective photochemical reaction, and lower side effect make it widespread application in gynecologic oncology. At present, photodynamic therapy has been used in diagnosing and treating lower genital tract carcinoma in situ, and advanced malignant tumor such as vulval and ovarian carcinoma.
Female ; Genital Neoplasms, Female ; drug therapy ; Hematoporphyrin Derivative ; therapeutic use ; Hematoporphyrin Photoradiation ; Humans ; Ovarian Neoplasms ; drug therapy ; Photochemotherapy ; Photosensitizing Agents ; therapeutic use ; Uterine Cervical Neoplasms ; drug therapy

The mutagenic effect of HpD on cell SCE and the reactions of cell SCE to different sources of light combined with HpD were studied using V79 cells. There were 6 doses of HpD: 1 microgram/ml, 3 micrograms/ml, 5 micrograms/ml, 10 micrograms/ml, 50 micrograms/ml and 100 micrograms/ml. The dose of 5 micrograms/ml is equal to the maximum dose of HpD used in the clinic (HpD per milliliter of patient's blood). Our experiments demonstrated that when the cells were cultured in the dark and HpD was added to the medium no more than 5 micrograms/ml, the SCE frequencies were not increased. The cells were irradiated with different sources of light without HpD, both the fluorescence and ultraviolet light could promote SCE but the light of daylight lamp and red light did not increase it. But when HpD was added into culture medium at the dose of less than 5 micrograms/ml, every light could increase the cell SCE intensively except the daylight lamp light. The red light was more notable than the others by relation analysis.
Cells, Cultured ; Fluorescence ; Hematoporphyrin Photoradiation ; Hematoporphyrins ; pharmacology ; Humans ; Light ; Photochemotherapy ; Sister Chromatid Exchange ; drug effects ; Ultraviolet Rays

OBJECTIVETo investigate biological effect of hematoporphyrin derivative (HpD) photodynamic therapy (PDT) on in vitro cultured nasopharyngeal carcinoma (NPC) cell lines CNE2 and C666-1.

METHODSCNE2 and C666-1 cells cultured in vitro were incubated in a medium containing HpD at different concentrations (0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, and 4.0 microg/ml) for 4 h followed by exposure to different light doses (2, 5, 10, and 20 J/cm2) using a diode laser at 630 nm with power density of 20 mW/cm2. After 24 h of incubation with HpD-PDT, the survival rate of CNE2 and C666-1 cells were analyzed by MTT assay.

RESULTSHpD-PDT produced effective killing of CNE2 and C666-1 cells cultured in vitro, and the killing effects were positively correlated with HpD concentration and the irradiation dose. Exposure of CNE2 and C666-1 cells to irradiation dose of 20 J/cm2 resulted in the IC50 of 0.7 and 1.2 microg/ml, respectively (P<0.01). With the same HpD concentration and irradiation dose, the survival rate of C666-1 cells, however, was significantly higher than that of CNE2 cells (P<0.05).

CONCLUSIONHpD-PDT may result in effective killing of CNE2 and C666-1 cells cultured in vitro, although C666-1 cells are less sensitive to HpD-PDT than CNE2 cells.

Antineoplastic Agents ; pharmacology ; Cell Line, Tumor ; Cell Survival ; drug effects ; radiation effects ; Dose-Response Relationship, Drug ; Dose-Response Relationship, Radiation ; Hematoporphyrin Derivative ; pharmacology ; Hematoporphyrin Photoradiation ; methods ; Humans ; Nasopharyngeal Neoplasms ; pathology ; Photochemotherapy ; methods ; Photosensitizing Agents ; pharmacology

OBJECTIVETo prepare photoimmunoconjugate of hematoporphyrin (HP) and herceptin, and study its killing and apoptosis-inducing effect on tumor cells BT-474.

METHODSHP-herceptin photoimmunoconjugate was synthesized with EDCI as the condensator. After exposure of the cells to 630 nm laser, the killing effect of the conjugate and cell apoptosis were evaluated by MTT assay and flow cytometry.

RESULTSCompared with free HP at equivalent dose, the immune reactivity, killing effect and the apoptosis-inducing effect of HP-herceptin immunoconjugate on BT-474 cells was enhanced (P<0.05).

CONCLUSIONThe killing effect of HP-herceptin immunoconjugate is stronger than free HP on BT-474 cells.

Antibodies, Monoclonal ; chemistry ; pharmacology ; Antibodies, Monoclonal, Humanized ; Antineoplastic Agents ; chemistry ; pharmacology ; Apoptosis ; drug effects ; Cell Line, Tumor ; Cell Survival ; drug effects ; Drug Compounding ; methods ; Flow Cytometry ; Hematoporphyrin Photoradiation ; methods ; Hematoporphyrins ; chemistry ; pharmacology ; Humans ; Immunoconjugates ; chemistry ; pharmacology ; Immunotherapy ; methods ; Photosensitizing Agents ; chemistry ; pharmacology ; Trastuzumab