Hematoporphyrin derivative photodynamic therapy is evolving as a local treatment for neoplastic disease. The emphasis of previous research has been on the determination of mechanisms of tumoricidal activity and defining the tumoricidal porphyrin component in hematoporphyrin derivative. The effect of hematoporphyrin derivative photodynamic therapy on normal tissue has received little attention. ...

In the preceding paper (1) the isolation and culture of Chlorella WEB-17 was described. Evidence was presented that this mutant produced three dicarboxylic porphyrins in relatively large amounts. In this paper we report the isolation from the porphyrin mixture of one of these dicarboxylic porphyrins and its characterization as hematoporphyrin isomer IX (Fig. 1). Hematoporphyrin has not previous...

THE RESULTS OF THESE OBSERVATIONS MAY BE BRIEFLY SUMMARIZED AS FOLLOWS: Feeding of hematoporphyrin to white mice over long periods of time produced no apparent changes in these animals and had no effect upon their sensitivity to light. Albino and slightly pigmented mice and rats injected with hematoporphyrin were protected from the rays of the sun by staining them a blue-black color with Verhoe...

A new mechanism of cell damage by alternating magnetic field with hematoporphyrin is described. C6 glioblastoma cell suspensions were exposed to an alternating magnetic field with frequency 180 kHz up to 60 min in the presence of hematoporphyrin in H2O and in D2O. The results presented suggest that an alternating magnetic field is able to activate hematoporphyrin, and this method may be a basis...

Hematoporphyrin is known to have photodynamic properties. The exposure of biomolecules or cells to hematoporphyrin and visible light can result in damage [l] and can even be lethal [2]. This inactivating effect appears to be greater in cancer cells than in corresponding normal cells [3]. This is thought to be due in part to the greater acc~ulation of hematoporphyrin in malignant tissue than in ...

AIM To synthesize a conjugate of hematoporphyrin with gold nanoparticles, and to evaluate its photodynamic activity in experiments on cultures of transformed cells. METHODS nanosized gold particles and nanocomposites synthesis methods, cell culture methods, photobiology methods, trypan blue dye exclusion test, chemiluminescence assay. RESULTS Various hematoporphyrin-gold nanocomposites were...

Malignant tumors take up and retain hematoporphyrin to a much greater extent than do normal tissues. Porphyrins are photodynamic agents that sensitize cells so that they are damaged by exposure to light. Treatment with hematoporphyrin followed by irradiation with light can destroy glioma cells in culture in less than 8 min and gliomas growing s.c. in rats in about 40 min. Photochemotherapy may ...

Singlet oxygen, a metastable state of normal triplet oxygen, has been identified as the cytotoxic agent that is probably responsible for in vitro inactivation of TA-3 mouse mammary carcinoma cells following incorporation of hematoporphyrin and exposure to red light. This photodynamic inactivation can be completely inhibited by intracellular 1,3-diphenylisobenzofuran. This very efficient singlet...

Hematoporphyrin derivative linked by ether bonds (HE) was synthesized by unambiguous procedures in order to compare its properties to hematoporphyrin derivative (HpD). Reverse phase high performance liquid and gel filtration chromatography were used to compare the HE derivatives to HpD. The cellular uptake of HE derivatives was compared to HpD using the WEHI 3B (D+) cell line and was shown to b...