Recombinant ROCK-I, ROCK-II, PKN, or citron kinase is expressed in HeLa cells as Myc-tagged proteins by transfection using Lipofectamine, and is precipitated from the cell lysates by the use of 9E10 monoclonal anti-Myc antibody coupled to G protein-Sepharose. Recovered immunocomplexes are incubated with various concentrations of [³²P]ATP and 10 mg of histone type 2 as substrates in the absence or presence of various concentrations of either Y-27632 or Y-30141 at 30°C for 30 min in a total volume of 30 μL of the kinase buffer containing 50 mM HEPES-NaOH, pH 7.4, 10 mM MgCl₂, 5 mM MnCl₂, 0.02% Briji 35, and 2 mM dithiothreitol. PKCa is incubated with 5 μM [³²P]ATP and 200 μg/mL histone type 2 as substrates in the absence or presence of various concentrations of either Y-27632 or Y-30141 at 30°C for 10 min in a kinase buffer containing 50 mM Tris-HCl, pH 7.5, 0.5 mM CaCl₂, 5 mM magnesium acetate, 25 μg/mL phosphatidyl serine, 50 ng/mL 12-O-tetradecanoylphorbol-13-acetate and 0.001% leupeptin in a total volume of 30 μL. Incubation is terminated by the addition of 10 μL of 43 Laemmli sample buffer. After boiling for 5 min, the mixture is subjected to SDS-polyacrylamide gel electrophoresis on a 16% gel. The gel is stained with Coomassie Brilliant Blue, and then dried. The bands corresponding to histone type 2 are excised, and the radioactivity is measured^[1].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

HeLa cells are plated at a density of 3×10⁴ cells per 3.5-cm dish. The cells are cultured in DMEM containing 10% FBS in the presence of 10 mM Thymidine for 16 h. After the cells are washed with DMEM containing 10% FBS, they are cultured for an additional 8 h, and then 40 ng/mL of Nocodazole is added. After 11.5 h of the Nocodazole treatment, various concentrations of Y-27632 (0-300 μM), Y-30141, or vehicle is added and the cells are incubated for another 30 min^[1].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Mice^[3]
Male, inbred Swiss albino mice (2-3 months old) weighing 25-30 g are used. Mice are injected with a sub-convulsive dose of PTZ (35 mg/kg, i.p.) (on Mondays, Wednesdays and Fridays) of each week for a total of 11 injections. After each PTZ injection, mice are observed for 30 min and the occurrence of convulsive activity is recorded. After 30 min, the mice are then injected with either Fasudil (25 mg/kg, i.p.) or Y-27632 (5 mg/kg, i.p.) and returned to their home cages until the next injection. Control mice for Fasudil and Y-27632 receives saline.
Rats^[4]
Male Wistar Kind A rats (200-250 g) are used. DMN (1 g/mL) is diluted ten times with saline (final concentration 1%) and 10 mg/kg per day of DMN is injected intraperitoneally (i.p.) on the first 3 days of each week for 4 weeks. Y27632 is given orally once per day at a dose of 30 mg/kg for 4 weeks starting on the day of the first injection of DMN. The dose of 30 mg/kg corrects hypertension in several rat models without toxicity. Twenty rats are randomized into four experimental groups (n=5 in each group) as follows: (1) S-S (injection of saline i.p. and oral administration of saline); (2) S-Y (injection of saline i.p. and oral administration of Y27632); (3) DMN-S (DMN i.p. and oral administration of saline); (4) DMN-Y (DMN i.p. and oral administration of Y27632). The rats are weighed every week. They are sacrificed at the end of the fourth week and the liver is excised. In addition, a blood sample is taken immediately before the rats are sacrificed.

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

• [1]. Ishizaki T, et al. Pharmacological properties of Y-27632, a specific inhibitor of rho-associated kinases. Mol Pharmacol. 2000 May;57(5):976-83.  [Content Brief]

  [2]. Xue ZW, et al. Rho-associated coiled kinase inhibitor Y-27632 promotes neuronal-like differentiation of adult human adipose tissue-derived stem cells.Chin Med J (Engl). 2012 Sep;125(18):3332-5.  [Content Brief]

  [3]. Tada S, et al. A selective ROCK inhibitor, Y27632, prevents dimethylnitrosamine-induced hepatic fibrosis in rats. J Hepatol. 2001 Apr;34(4):529-36.  [Content Brief]

  [4]. Inan S, et al. Antiepileptic effects of two Rho-kinase inhibitors, Y-27632 and fasudil, in mice. Br J Pharmacol. 2008 Sep;155(1):44-51.  [Content Brief]

  [5]. Maldonado M, et al. ROCK inhibitor primes human induced pluripotent stem cells to selectively differentiate towardsmesendodermal lineage via epithelial-mesenchymal transition-like modulation. Stem Cell Res. 2016 Sep;17(2):222-227.  [Content Brief]

  [6]. Kan L, et al. Rho-Associated Kinase Inhibitor (Y-27632) Attenuates Doxorubicin-Induced Apoptosis of Human Cardiac Stem Cells. PLoS One. 2015;10(12):e0144513. Published 2015 Dec 8.  [Content Brief]

  [7]. Zhang L, et al. ROCK inhibitor Y-27632 suppresses dissociation-induced apoptosis of murine prostate stem/progenitor cells and increases their cloning efficiency. PLoS One. 2011;6(3):e18271. Published 2011 Mar 28.  [Content Brief]

  [8]. Svoboda KK, et al. ROCK inhibitor (Y27632) increases apoptosis and disrupts the actin cortical mat in embryonic avian corneal epithelium. Dev Dyn. 2004;229(3):579-590.  [Content Brief]