A ROCK inhibitor
Rho-associated kinase (ROCK), activated by GTP-
1.Sasaki, Y., Suzuki, M., and Hidaka, H.The novel and specific Rho-kinase inhibitor (S)-(+)-2-methyl-1-[(4-methyl-5-isoquinoline)sulfonyl]-homopiperazine as a probing molecule for Rho-kinase-involved pathwayPharmacol. Ther.93225-232(2002) 2.Ikenoya, M., Hidaka, H., Hosoya, T., et al.Inhibition of Rho-kinase-induced myristoylated alanine-rich C kinase substrate (MARCKS) phosphorylation in human neuronal cells by H-1152, a novel and specific Rho-kinase inhibitorJ. Neurochem.819-16(2002) 3.Davies, S.L., Gibbons, C.E., Vizard, T., et al.Ca2+-sensing receptor induces Rho kinase-mediated actin stress fiber assembly and altered cell morphology, but not in response to aromatic amino acidsAm. J. Physiol. Cell Physiol.290C1543-C1551(2006) 4.Johnson, R.P., El-Yazbi, A.F., Takeya, K., et al.Ca2+ sensitization via phosphorylation of myosin phosphatase targeting subunit at threonine-855 by Rho kinase contributes to the arterial myogenic responseJ. Physiol.587(11)2537-2553(2009) 5.Rattan, S., and Patel, C.A.Selectivity of Rho kinase (ROCK) inhibitors in the spontaneously tonic smooth muscleAm. J. Physiol. Gastrointest. Liver Physiol.294(3)G687-G693(2008) 6.Fuentes, E.O., Leemhuis, J., Stark, G.B., et al.Rho kinase inhibitors Y27632 and H1152 augment neurite extension in the presence of cultured Schwann cellsJ. Brachial Plex. Peripher. Nerve Inj.3(19)(2008)
Kinase experiment: | Inhibitors (including H-1152) are added at the indicated concentrations to 50 μL of the assay mixture 50 mM Tris-HCl (pH 7.5), 5 mM MgCl2, 1 mM EDTA, 1 mM EGTA, 1 mM dithiothreitol, 40 μM S6-peptide, various concentrations of [γ-32P]ATP and purified Rho-kinase. The reactions are started by the addition of [γ-32P]ATP and carried out at 30°C for 5 min. The Michaelis-Menten equation is used to calculate the Michaelis constant (Km) and maximal velocity (Vmax) of Rho-kinase. Data are further analyzed with secondary plot to calculate the inhibitory constant (Ki)[2]. |
Cell experiment: | Briefly, cells are routinely plated on poly-d-lysine/laminin coated 96 well plates or in 16 well glass culture slides. Control medium contained Dulbecco's modified Eagles medium/Hams F12(1:1) (DMEM/F12), 2 mM l-glutamine, N2 mix (1:100 dilution), 0.63 mL of 45% glucose for each 100 mL of DMEM/F12, neurotrophin 3 (NT3; final concentration, 8 ng/mL), BDNF (final concentration 8 ng/mL), and 10% fetal bovine serum heat inactivated before use. LIF cultures contain control medium+LIF (50 ng/mL). BMP4 cultures contain control medium+bone morphogenetic protein 4 (BMP4; 25 ng/mL). Total volume of culture is 110 μL. ROCK inhibitor H-1152 is diluted in water and added in an additional 10 μL to cultures 24 h after plating. Water is added to controls. Eighteen hours after the addition of inhibitor, cultures are fixed in 4% paraformaldehyde (1 h at room temperature for peroxidase-linked labeling and 20 min at room temperature for fluorescence labeling). For ArrayScan/Cellomics automated analysis: Cells are plated in a total volume of 50 μL on 384 well plastic plates previously coated with poly-d-lysine/laminin, and cultured in the same medium[3]. |
参考文献: [1]. Tamura M, et al. Development of specific Rho-kinase inhibitors and their clinical application. Biochim Biophys Acta. 2005 Dec 30;1754(1-2):245-52. Epub 2005 Sep 12. | |
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