Demethyl tetrandrine
Demethyl tetrandrine and tetrandrine show inhibition on DNA synthesis, the 50% inhibition doses ( ID50 ) are in L7712 and Sl80 cells are 27.5, 24.5 mg/L and 2.6, 3 .5mg/ L , respectively.
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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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《Chinese Pharmacological Bulletin》 1990-01
INHIBITION OF TETRANDRINE AND DEMETHYL TETRANDRINE ON DNA, RNA AND PROTEIN SYNTHESES OF LEUKEMIA 7712 AND SARCOMA 180 CELLS[Reference:
WebLink]
METHODS AND RESULTS:
The 50% inhibition doses ( ID50 ) of tetrandrine and Demethyl tetrandrine on DNA synthesis in L7712 and Sl80 cells are 2.6, 3 .5mg/ L and 27.5, 24.5mg/L respectively. The DNA synthesis inhibition is likely due to DNA template damage caused by both natural products. The inhibition of DNA, RNA and protein syntheses by tetrandrine or Demethyl tetrandrine increased with incubating time. The inhibiting activities of two natural products on DNA and RNA synthesis are s-tronger than on protein.
CONCLUSIONS:
There are no differences either in inhibiting activity or in inhibiting mechanism between two natural products.
