Kuwanon H
Kuwanon H, and possibly kuwanon G also, are specific antagonists for the gastrin-releasing peptide (GRP) -preferring receptor and can be useful for studying the physiological and pathological role of GRP.
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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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The packaging of the product may have turned upside down during transportation, resulting in the natural compounds adhering to the neck or cap of the vial. take the vial out of its packaging and gently shake to let the compounds fall to the bottom of the vial. for liquid products, centrifuge at 200-500 RPM to gather the liquid at the bottom of the vial. try to avoid loss or contamination during handling.
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Biochem Biophys Res Commun. 1995 Aug 15;213(2):594-9.
Non-peptide bombesin receptor antagonists, kuwanon G and H, isolated from mulberry.[Pubmed:
7646517 ]
METHODS AND RESULTS:
Kuwanon G and H, isolated from the methanol extract of Morus bombycis, inhibited specific binding of [125I]gastrin-releasing peptide (GRP) to GRP-preferring receptors in murine Swiss 3T3 fibroblasts with Ki values of 470 and 290 nM, respectively. Kuwanon H was one order of magnitude less potent for inhibiting [125I]bombesin binding to neuromedin B (NMB)-preferring receptors in rat esophagus membranes. This compound antagonized bombesin-induced increases in the cytosolic free calcium concentration and GRP-induced DNA synthesis in Swiss 3T3 cells.
CONCLUSIONS:
Thus, Kuwanon H, and possibly kuwanon G also, are specific antagonists for the GRP-preferring receptor and can be useful for studying the physiological and pathological role of GRP.
