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        Signal Transduction Inhibitors in Cellular Function

        互联网

        1171
        Signal transduction pathways mediate cell-cell interactions and integrate signals from the extracellular environment through specific receptors at the cell membrane. They play a pivotal role in regulating cellular growth and differentiation and in mediating many physiological and pathological processes, such as apoptosis, inflammation, and tumor development. The mitogenactivated protein kinases (MAPKs) constitute a cascade of phosphorylation events that transmit extracellular growth signals through membrane-bound Ras to the nucleus of the cell. In this chapter, detailed protocols for analyzing the kinase activities of the key components of the MAPKs pathway—MEK1, ERK1, JNK, and p38 MAPK—are described. A brief introduction to the chemical inhibitors to the MAPKs pathway is provided in the method section of each kinase assay. Inhibitors of other signaling pathways are summarized in Table 1 . The reporter assay of cyclin D1, a key downstream target gene of MAPKs pathway, is also described in detail.
        Table 1.  Signal Transduction Pathways and Inhibitors

        Signal Transduction Pathways

        Inhibitors

        References

        Tyrosine Kinase Growth Factor Receptors

           

        HER2/Neu inhibitor

        Herceptin (anti-HER2 antibody)

        (53,54)

        EGF receptors

        IMC-C225 (anti-EGFR antidody)

        (55,56)

        EGFR-Tyrosine kinase

        ZD1839, pyridopyrimidines

        (54,57,58)

        Ras Signaling

           

        Inhibitors of Ras farnesyltransferase FPP analogues

           

        CAAX peptide analogues

        BZA-5B, L-739, Cys-4-ABA-Met FT1-276, SCH44342, SCH66336

        (5759)

        Bisubstrate inhibitors

        BMS-182878, BMS-184467

        (5759)

        Inhibitors of the Raf protein kinases

        ISIS5132, BAY43-9006

        (5759)

        Mitogen-Activated Protein Kinase Pathways

           

        Inhibitors of MEK

        PD184352, PD098059, U0126, R009-22110

        (17,20,21 , 2327)

        Inhibitors of ERK1 and ERK2

        PD098059, E64D, calpeptin

        (5,28)

        Inhibitors of JNKs

        SB600125

        (33,34)

        Inhibitors of p38 kinases

        SB203580, SB202190, SB242235, SB239063, SB220025, SB202474, SC68376, FR167653

        (36,37 , 3944,46)

        Inhibitors of PI3-Kinase Signaling Pathways

        Wortmannin, LY294002

        (60,61)

        Protein Phosphatases Inhibitors Proteasome Inhibitors

        Microcystines, calyculins, cantharidin

        (67)

        Peptide aldehydes

        ALLN, MG132, PSI, MG115

        (63)

        Peptide boronates

        MG262

        (63)

        Nonpeptide inhibitors

        Lactacystin

        (63)

        DCI

        3,4-DCI

        (63,64)

        Peptide vinyl sulfones

        NLVS, YL3YS

        (63)

        Epoxyketones

        Epoxomicin, eponemycin, Ac-hFLFL-epoxide

        (63,65)

        Bivalent inhibitors

        Polyoxyethylene

        (66,67)

        Natural compound inhibitors

        TMC-95A, gliotoxin, EGCG

        (63,68)

        Histone Deacetylase inhibitors

           

        Short-chain fatty acids

        Butyrates

        (70,75)

        Hydroxamic acids

        Trichostatin A, oxamflatin

        (73)

        Cyclic peptides

        Trapoxin A, FR901228, apicidin

         

        Benzamides

        MS-27275

        (78,80)

        SIR2 inhibitors

        Nicotinamide, splitomicin

        (78,79)

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