Abstract：
AIMS:To determine the capacity of extracts of Pelargonium reniforme and Pelargonium sidoides, plants of the Geraniaceae family, to stimulate the uptake and killing of mycobacteria by murine macrophages and to identify the constituents that are responsible. METHODS AND RESULTS:Bioassay-guided fractionation of aqueous P. reniforme extracts yielded five chemically distinct structures with the capacity to increase the rate of intracellular killing by macrophages. These were: gallic acid, methyl gallate, myricetin and quercitin-3-O-beta-d-glucoside, in addition to the previously unrecognized constituent 1-O-(2-(4-methoxyphenyl)ethyl-6-O-galloyl-glucopyranoside. Kinetics of intracellular accumulation of Mycobacterium tuberculosis and Mycobacterium fortuitum by macrophages were indistinguishable; pure preparations of the four previously known plant constituents stimulated macrophage killing, but not uptake, of M. tuberculosis and M. fortuitum equally well. CONCLUSIONS:A number of distinct molecular species are present in the medicinal plant P. reniforme that stimulate the killing of the intracellular pathogen M. tuberculosis. SIGNIFICANCE AND IMPACT OF THE STUDY:These observations support the view that Pelargonium extracts may have utility in the treatment of tuberculosis.
journal_name
J Appl Microbioljournal_title
Journal of applied microbiologyauthors
Kim CE,Griffiths WJ,Taylor PWdoi
10.1111/j.1365-2672.2008.04085.xsubject
Has Abstractpub_date
2009-04-01 00:00:00pages
1184-93issue
4eissn
1364-5072issn
1365-2672pii
JAM4085journal_volume
106pub_type
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