Cell experiment:

Cell viability is determined by MTT assay. Cells are seeded in triplicate at a concentration of 1×105 cells/well on a 96-well plate. SNU-C4 cells are treated with amygdalin at concentrations of 0.25, 0.5, 2.5, and 5 mg/mL for 24 h. After MTT is added to each group, the cells are incubated for 4 h. Then, they are further incubated for 1 h, including the solution in which MTT is dissolved[2].

Animal experiment:

Rats: The amygdalin powder is dissolved in saline and diluted with appropriate medium. Male Sprague–Dawley rats weighing 230-250 g are used for this experiment. 50mL of 5% formalin are injected to produce fomalin-induced pain in the rats. Thirty minutes before the formalin injection to induce pain, the rats are given an intramuscular injection of amygdalin solution (0.1, 0.5, 1.0, 10 mg/kg), or saline as a vehicle control[3].

Amygdalin is a plant glucoside isolated from the stones of rosaceous fruits, such as apricots, peaches, almond, cherries, and plums.

Amygdalin has antitumor activity. Some advances had been made on the antitumor mechanism of amygdalin[1]. Amygdalin downregulates especially genes belonging to cell cycle category: exonuclease 1, ATP-binding cassette, sub-family F, member 2, MRE11 meiotic recombination 11 homolog A, topoisomerase (DNA) I, and FK506 binding protein 12-rapamycin-associated protein 1. RT-PCR analysis reveals that mRNA levels of these genes are also decreased by amygdalin treatment in SNU-C4 human colon cancer cells[2].

Amygdalin is effective at alleviating inflammatory pain and that it can be used as an analgesic with anti-nociceptive and anti-inflammatory activities. The intramuscular injection of amygdalin significantly reduced the formalin-induced tonic pain in both early (the initial 10 min after formalin injection) and late phases (10-30 min following the initial formalin injection). During the late phase, amygdalin reduces the formalin-induced pain in a dose-dependentmanner in a dose range less than 1 mg/kg[3].

References:
[1]. Song Z, et al. Advanced research on anti-tumor effects of amygdalin. J Cancer Res Ther. 2014 Aug;10 Suppl 1:3-7.
[2]. Park HJ,et al. Amygdalin inhibits genes related to cell cycle in SNU-C4 human colon cancer cells. World J Gastroenterol. 2005 Sep 7;11(33):5156-61.
[3]. Hwang HJ,et al. Antinociceptive effect of amygdalin isolated from Prunus armeniaca on formalin-induced pain in rats. Biol Pharm Bull. 2008 Aug;31(8):1559-64.