title: The monitoring of the accumulation of protoporphyrin IX in Walker tumours by subcutaneous administration of delta-aminolevulinic acid.
abstract: Photodynamic therapy with protoporphyrin IX induced by delta-aminolevulinic acid (ALA) is mainly applied for the treatment of human superficial skin cancer. In this paper we present our study on photodynamic therapy (PDT) of the implanted Walker tumours using subcutaneous administration of ALA to improve the availability of ALA in the skin. We determined the accumulation and localization of protoporphyrin IX (PpIX) after subcutaneous administration of different concentrations of ALA in a physiological saline solutions, using fluorescence imaging technique. The results obtained indicate that PpIX accumulation depends on the concentration of ALA. The temporal behavior of PpIX fluorescence has shown a clear demarcation of tumoural zone depending on the post-administration time and the administrated concentration of the ALA solution. Further studies are needed to confirm these encouraging results and to define the PDT protocols using subcutaneous administration of ALA solution
authors.affiliation: national Institute for Research and Development for Optoelectronics, INOE 2000, P.O. Box MG5, Bucharest, Romania.
authors.forename: Mihaela Antonina
authors.initials: MA
authors.lastname: Calin
authors.forename: Maria luliana
authors.initials: Ml
authors.lastname: Gruia
authors.forename: Nicoleta
authors.initials: N
authors.lastname: Herascu
authors.forename: Toma
authors.initials: T
authors.lastname: Coman
mesh_terms: D000622:Aminolevulinic Acid / Q000008:administration & dosage / Q000493:pharmacokinetics*; D000818:Animals; D002279:Carcinoma 256, Walker / Q000188:drug therapy*; D007279:Injections, Subcutaneous; D010778:Photochemotherapy; D017319:Photosensitizing Agents / Q000008:administration & dosage / Q000493:pharmacokinetics*; D011524:Protoporphyrins / Q000493:pharmacokinetics*; D051381:Rats; D017208:Rats, Wistar; D012878:Skin Neoplasms / Q000188:drug therapy
chemical_list: D017319:Photosensitizing Agents; D011524:Protoporphyrins; D000622:Aminolevulinic Acid; C028025:protoporphyrin IX