title: Histomorphological changes in murine fibrosarcoma after hypericin-based photodynamic therapy.
abstract: Histomorphological changes in murine fibrosarcoma after photodynamic therapy (PDT) based on the natural photosensitizer hypericin were evaluated. C3H/DiSn mice were inoculated with fibrosarcoma G5:1:13 cells. When the tumour reached a volume of 40-80 mm(3) the mice were intraperitoneally injected with hypericin, either in a single dose (5 mg/kg; 1 or 6 h before laser irradiation) or two fractionated doses (2.5 mg/kg; 6 and 1 h before irradiation with laser light; 532 nm, 70 mW/cm(2), 168 J/cm(2)). All groups of PDT-treated animals with single and fractionated hypericin dosing presented primary vascular reactions including vascular dilatation, congestion, thrombosis and oedema. Two hours after PDT there were necrotic changes with small, rather focal appearance. One day after therapy the necrotic areas were enhanced, often affecting a complete superficial layer of tumour tissue. Necrotic areas were accompanied with inflammation and haemorrhages.
authors.affiliation: P. J. Safárik University, Kosice, Slovakia.
authors.forename: Nikita
authors.initials: N
authors.lastname: Bobrov
authors.forename: Ivan
authors.initials: I
authors.lastname: Cavarga
authors.forename: Frantisek
authors.initials: F
authors.lastname: Longauer
authors.forename: Silvia
authors.initials: S
authors.lastname: Rybárová
authors.forename: Peter
authors.initials: P
authors.lastname: Fedorocko
authors.forename: Peter
authors.initials: P
authors.lastname: Brezáni
authors.forename: Pavol
authors.initials: P
authors.lastname: Miskovský
authors.forename: Ladislav
authors.initials: L
authors.lastname: Mirossay
authors.forename: Ján
authors.initials: J
authors.lastname: Stubna
mesh_terms: D000818:Animals; D000873:Anthracenes; D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D045744:Cell Line, Tumor / Q000187:drug effects; D004195:Disease Models, Animal; D005354:Fibrosarcoma / Q000188:drug therapy / Q000473:pathology; D006801:Humans; D020902:Hypericum; D007274:Injections, Intraperitoneal; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H; D010569:Perylene / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology / Q000627:therapeutic use; D010778:Photochemotherapy; D017319:Photosensitizing Agents / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D008517:Phytotherapy; D010936:Plant Extracts / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use; D011829:Radiation Dosage
chemical_list: D000873:Anthracenes; D000972:Antineoplastic Agents, Phytogenic; D017319:Photosensitizing Agents; D010936:Plant Extracts; D010569:Perylene; C004965:hypericin