Photodynamic activity of plant extracts from Sarawak, Borneo.
Photodynamic therapy (PDT) is a medical treatment that involves the irradiation of an administered photosensitizing drug with light of a particular wavelength to activate the photosensitizer to kill abnormal cells. To date, only a small number of photosensitizers have been clinically approved for PDT, and researchers continue to look for new molecules that have more desirable properties for clinical applications. Natural products have long been important sources of pharmaceuticals, and there is a great potential for discovery of novel chemotypes from under-explored biodiversities in the world. The objective of this study is to mine the terrestrial plants in Sarawak, Borneo Island, for new photosensitizers for PDT. In a screening program from 2004 to 2008, we prepared and studied 2,400 extracts from 888 plants for their photosensitizing activities. This report details the bioprospecting process, preparation and testing of extracts, analysis of the active samples, fractionation of four samples, and isolation and characterization of photosensitizers.
Sarawak Biodiversity Centre (SBC), KM 20 Jalan Borneo Heights, Semengoh, Locked Bag No. 3032, 93990 Kuching, Sarawak, Malaysia.
Wan Wui
WW
Jong
Pei Jean
PJ
Tan
Fadzly Adzhar
FA
Kamarulzaman
Michele
M
Mejin
Diana
D
Lim
Ida
I
Ang
Margarita
M
Naming
Tiong Chia
TC
Yeo
Anthony Siong Hock
AS
Ho
Soo Hwang
SH
Teo
Hong Boon
HB
Lee
D027926:Anacardiaceae / Q000737:chemistry; D001893:Borneo; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D030024:Curcuma / Q000737:chemistry; D018922:HL-60 Cells; D006801:Humans; D020014:K562 Cells; D019686:Lamiaceae / Q000737:chemistry; D008027:Light; D009682:Magnetic Resonance Spectroscopy; D008296:Malaysia; D015394:Molecular Structure; D017319:Photosensitizing Agents / Q000737:chemistry* / Q000494:pharmacology; D010936:Plant Extracts / Q000737:chemistry* / Q000494:pharmacology; D052583:Sarraceniaceae / Q000737:chemistry / Q000145:classification
D017319:Photosensitizing Agents; D010936:Plant Extracts
Curcumins; Photodynamic therapy; Photosensitizers; Porphyrins