Bisandrographolide A
Bisandrographolide A activates TRPV4 channels, could play a role in some of the effects of Andrographis extract described in traditional medicine.
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Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to
24 months(2-8C).
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20C. Generally, these will be useable for up to two weeks. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.
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J Biol Chem. 2006 Oct 6;281(40):29897-904.
Bisandrographolide from Andrographis paniculata activates TRPV4 channels.[Pubmed:
16899456]
Many transient receptor potential (TRP) channels are activated or blocked by various compounds found in plants; two prominent examples include the activation of TRPV1 channels by capsaicin and the activation of TRPM8 channels by menthol.
METHODS AND RESULTS:
We sought to identify additional plant compounds that are active on other types of TRP channels. We screened a library of extracts from 50 Chinese herbal plants using a calcium-imaging assay to find compounds active on TRPV3 and TRPV4 channels. An extract from the plant Andrographis paniculata potently activated TRPV4 channels. The extract was fractionated further, and the active compound was identified as Bisandrographolide A (BAA). We used purified compound to characterize the activity of Bisandrographolide A on certain TRPV channel subtypes. Although Bisandrographolide A activated TRPV4 channels with an EC(50) of 790-950 nm, it did not activate or block activation of TRPV1, TRPV2, or TRPV3 channels. Bisandrographolide A activated a large TRPV4-like current in immortalized mouse keratinocytes (308 cells) that have been shown to express TRPV4 protein endogenously. This compound also activated TRPV4 currents in cell-free outside-out patches from HEK293T cells overexpressing TRPV4 cDNA, suggesting that Bisandrographolide A can activate the channel in a membrane-delimited manner. Another related compound, andrographolide, found in abundance in the plant Andrographis was unable to activate or block activation of TRPV4 channels.
CONCLUSIONS:
These experiments show that Bisandrographolide A activates TRPV4 channels, and we discuss the possibility that activation of TRPV4 by Bisandrographolide A could play a role in some of the effects of Andrographis extract described in traditional medicine.
