Biomaterial Database

Oxygen dependence of the photosensitizing effect of hematoporphyrin derivative in NHIK 3025 cells. 1985

J Moan, and S Sommer

Cells of the established line NHIK 3025 were incubated with hematoporphyrin derivative and exposed to light at different concentrations of oxygen. The efficiency of photoinactivation of the sensitized cells decreased with decreasing oxygen concentration. No photoinactivation was observed when the atmosphere above the medium overlying the cells was pure N2 gas. With 1% O2 in the atmosphere, the quantum yield of photoinactivation was reduced by 50% compared to the yield in air-saturated medium. It is hardly possible to inactivate cells in anoxic regions of a tumor by means of porphyrin sensitized photochemotherapy. In spite of this, the therapy seems to be efficient in several cases. Thus, it seems that anoxic tumor cells are inactivated in secondary reactions, probably due to breakdown of the circulatory system in the tumor.

UI	MeSH Term	Description	Entries
D009369	Neoplasms	New abnormal growth of tissue. Malignant neoplasms show a greater degree of anaplasia and have the properties of invasion and metastasis, compared to benign neoplasms.	Benign Neoplasm,Cancer,Malignant Neoplasm,Tumor,Tumors,Benign Neoplasms,Malignancy,Malignant Neoplasms,Neoplasia,Neoplasm,Neoplasms, Benign,Cancers,Malignancies,Neoplasias,Neoplasm, Benign,Neoplasm, Malignant,Neoplasms, Malignant
D010100	Oxygen	An element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration.	Dioxygen,Oxygen-16,Oxygen 16
D010778	Photochemotherapy	Therapy using oral or topical photosensitizing agents with subsequent exposure to light.	Blue Light Photodynamic Therapy,Photodynamic Therapy,Red Light PDT,Red Light Photodynamic Therapy,Therapy, Photodynamic,Light PDT, Red,PDT, Red Light,Photochemotherapies,Photodynamic Therapies,Therapies, Photodynamic
D002278	Carcinoma in Situ	A lesion with cytological characteristics associated with invasive carcinoma but the tumor cells are confined to the epithelium of origin, without invasion of the basement membrane.	Carcinoma, Intraepithelial,Carcinoma, Preinvasive,Intraepithelial Neoplasms,Neoplasms, Intraepithelial,Intraepithelial Carcinoma,Intraepithelial Neoplasm,Neoplasm, Intraepithelial,Preinvasive Carcinoma
D002460	Cell Line	Established cell cultures that have the potential to propagate indefinitely.	Cell Lines,Line, Cell,Lines, Cell
D002470	Cell Survival	The span of viability of a cell characterized by the capacity to perform certain functions such as metabolism, growth, reproduction, some form of responsiveness, and adaptability.	Cell Viability,Cell Viabilities,Survival, Cell,Viabilities, Cell,Viability, Cell
D006415	Hematoporphyrins	Iron-free derivatives of heme with 4 methyl groups, 2 hydroxyethyl groups and 2 propionic acid groups attached to the pyrrole rings. Some of these PHOTOSENSITIZING AGENTS are used in the PHOTOTHERAPY of malignant NEOPLASMS.	Haematoporphyrin IX,Hematoporphyrin,Hemedonin