Linked Life Data

18336750

Source:http://linkedlifedata.com/resource/pubmed/id/18336750

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PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2008-3-13
pubmed:abstractText
Malignant gliomas, with an incidence of 5 cases per 100,000 population per year, represent the most common primary brain tumour. They have an overall survival length of less than 2 years. Many different adjuvant therapies have been developed. Among them, Photodynamic Therapy (PDT), that is based on photochemical reactions between light and tumoral tissue selectively labelled with exogenous photosensitizing agents. Among photosensitizers, m-THPC (Temoporfin), seems to be the most promising one for the treatment of brain tumors, but, unfortunately, it causes problems of high skin photosensitivity. To by-pass this problem, we devised an intratumoral route of administration of this photosensitizer. The aim of this study is to investigate and compare the uptake of m-THPC in brain tumor and normal tissue after systemic and intratumoral administration of the drug. 30 female Wistar rats received m-THPC 12 days after C6 tumor implantation. Temoporfin was administered intratumorally in 24 rats at two different concentrations. 6 rats constituted the control group and received m-THPC by means of an intraperitoneal injection. The brains were extracted at 4 h, 24 h and 96 h after Temoporfin injection. The samples were examined with a confocal laser scanning microscope. All samples showed high fluorescence emission exclusively in the tumour area, without appreciable differences between the samples taken at the different times of sacrifice and the two routes of administration. No fluorescence whatsoever was detected among normal brain tissue surrounding the tumour. The intratumoral route appears to give comparable results to the systemic one, regarding intracellular uptake efficiency and tumour--normal tissue ratio, with the advantage of a much shorter time needed to reach optimal intratumoural concentration--that is just four hours from m-THPC injection.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0394-6320
pubmed:author
pubmed:issnType
Print
pubmed:volume
21
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
227-31
pubmed:meshHeading
pubmed:articleTitle
Intratumoral vs systemic administration of meta-tetrahydroxyphenylchlorin for photodynamic therapy of malignant gliomas: assessment of uptake and spatial distribution in C6 rat glioma model.
pubmed:affiliation
Institute of Neurosurgery, Catholic University of the Sacred Heart, Rome, Italy. mannins@fastwebnet.it
pubmed:publicationType
Journal Article