Key Spec Table
|Species Reactivity||Key Applications||Host||Format||Antibody Type|
|H||WB, IHC||Rb||Purified||Polyclonal Antibody|
|Presentation||0.1M Tris-glycine, pH 7.4, 0.15M NaCl with 0.05% sodium azide|
|Application||Anti-HSP27 Antibody detects level of HSP27 & has been published & validated for use in WB, IH.|
|Safety Information according to GHS|
|Storage and Shipping Information|
|Storage Conditions||2 years at -20°C|
|Material Size||250 µg|
|Anti-HSP27 (rabbit polyclonal IgG) - 2138413||2138413|
|Anti-HSP27 (rabbit polyclonal IgG) - 2147325||2147325|
|Anti-HSP27 (rabbit polyclonal IgG) - 2410235||2410235|
|Anti-HSP27 (rabbit polyclonal IgG) - 2189945||2189945|
|Anti-HSP27 (rabbit polyclonal IgG) - 2283381||2283381|
|Anti-HSP27 - 14533||14533|
|Anti-HSP27 - 22714||22714|
|Anti-HSP27 - 25912||25912|
|Anti-HSP27 - 29457||29457|
|Anti-HSP27 - DAM1734761||DAM1734761|
|Reference overview||Application||Species||Pub Med ID|
|Rottlerin-mediated inhibition of Chlamydia trachomatis growth and uptake of sphingolipids is independent of p38-regulated/activated protein kinase (PRAK).|
Lei, L; Li, Z; Zhong, G
PloS one 7 e44733 2012
We previously found that rottlerin, a plant-derived small molecule compound, profoundly inhibited Chlamydia trachomatis growth and blocked sphingolipid trafficking from host cell Golgi into chlamydial inclusions. Since the p38-regulated/activated protein kinase (PRAK) is a known target of rottlerin and is activated in Chlamydia trachomatis-infected cells, we investigated the potential role of this kinase in rottlerin-mediated anti-chlamydial activity. However, we found that a PRAK-specific inhibitor failed to inhibit chlamydial growth, suggesting that the kinase activity of PRAK may not be required for chlamydial intracellular replication. This conclusion was supported by the observation that chlamydial organisms replicated equally well in mouse embryonic fibroblast cells with or without PRAK. Moreover, neither the PRAK inhibitor nor PRAK deficiency altered host sphingolipid trafficking into chlamydial inclusions. Finally, rottlerin maintained its anti-chlamydial activity in PRAK-deficient cells. Together, these observations have demonstrated that PRAK is not required for either the rottlerin-mediated anti-chlamydial activity or rottlerin inhibition of sphingolipid trafficking, suggesting that rottlerin may achieve its inhibitory role by targeting other host factors.
|Acetylation of heat shock protein 20 (Hsp20) regulates human myometrial activity.|
Karolczak-Bayatti, M; Sweeney, M; Cheng, J; Edey, L; Robson, SC; Ulrich, SM; Treumann, A; Taggart, MJ; Europe-Finner, GN
The Journal of biological chemistry 286 34346-55 2011
Phosphorylation of heat shock protein 20 (Hsp20) by protein kinase A (PKA) is now recognized as an important regulatory mechanism modulating contractile activity in the human myometrium. Thus agonists that stimulate cyclic AMP production may cause relaxation with resultant beneficial effects on pathologies that affect this tissue such as the onset of premature contractions prior to term. Here we describe for the first time that acetylation of Hsp20 is also a potent post-translational modification that can affect human myometrial activity. We show that histone deacetylase 8 (HDAC8) is a non-nuclear lysine deacetylase (KDAC) that can interact with Hsp20 to affect its acetylation. Importantly, use of a selective linkerless hydroxamic acid HDAC8 inhibitor increases Hsp20 acetylation with no elevation of nuclear-resident histone acetylation nor marked global gene expression changes. These effects are associated with significant inhibition of spontaneous and oxytocin-augmented contractions of ex vivo human myometrial tissue strips. A potential molecular mechanism by which Hsp20 acetylation can affect myometrial activity by liberating cofilin is described and further high-lights the use of specific effectors of KDACs as therapeutic agents in regulating contractility in this smooth muscle.
|PRKC-ζ Expression Promotes the Aggressive Phenotype of Human Prostate Cancer Cells and Is a Novel Target for Therapeutic Intervention.|
Yao, S; Bee, A; Brewer, D; Dodson, A; Beesley, C; Ke, Y; Ambroisine, L; Fisher, G; Møller, H; Dickinson, T; Gerard, P; Lian, LY; Risk, J; Lane, B; Smith, P; Reuter, V; Berney, D; Gosden, C; Scardino, P; Cuzick, J; Djamgoz, MB; Cooper, C; Foster, CS
Genes & cancer 1 444-64 2010
We show protein kinase C-zeta (PKC-ζ) to be a novel predictive biomarker for survival from prostate cancer (P less than 0.001). We also confirm that transcription of the PRKC-ζ gene is crucial to the malignant phenotype of human prostate cancer. Following siRNA silencing of PRKC-ζ in PC3-M prostate cancer cells, stable transfectant cell line si-PRKC-ζ-PC3-M(T1-6) is phenotypically nonmalignant in vitro and in vivo. Genome-wide expression analysis identified 373 genes to be differentially expressed in the knockdown cells and 4 key gene networks to be significantly perturbed during phenotype modulation. Functional interconnection between some of the modulated genes is revealed, although these may be within different regulatory pathways, emphasizing the complexity of their mutual interdependence. Genes with altered expression following PRKC-ζ knockdown include HSPB1, RAD51, and ID1 that we have previously described to be critical in prostatic malignancy. Because expression of PRKC-ζ is functionally involved in promoting the malignant phenotype, we propose PKC-ζ as a novel and biologically relevant target for therapeutic intervention in prostate cancer.
|Thiolutin inhibits endothelial cell adhesion by perturbing Hsp27 interactions with components of the actin and intermediate filament cytoskeleton.|
Yifeng Jia,Shiaw-Lin Wu,Jeff S Isenberg,Shujia Dai,John M Sipes,Lyndsay Field,Bixi Zeng,Russell W Bandle,Lisa A Ridnour,David A Wink,Ramani Ramchandran,Barry L Karger,David D Roberts
Cell stress & chaperones 15 2010
Thiolutin is a dithiole synthesized by Streptomyces sp. that inhibits endothelial cell adhesion and tumor growth. We show here that thiolutin potently inhibits developmental angiogenesis in zebrafish and vascular outgrowth from tissue explants in 3D cultures. Thiolutin is a potent and selective inhibitor of endothelial cell adhesion accompanied by rapid induction of HSPB1 (Hsp27) phosphorylation. The inhibitory effects of thiolutin on endothelial cell adhesion are transient, potentially due to a compensatory increase in Hsp27 protein levels. Accordingly, heat shock induction of Hsp27 limits the anti-adhesive activity of thiolutin. Thiolutin treatment results in loss of actin stress fibers, increased cortical actin as cells retract, and decreased cellular F-actin. Mass spectrometric analysis of Hsp27 binding partners following immunoaffinity purification identified several regulatory components of the actin cytoskeleton that associate with Hsp27 in a thiolutin-sensitive manner including several components of the Arp2/3 complex. Among these, ArpC1a is a direct binding partner of Hsp27. Thiolutin treatment induces peripheral localization of phosphorylated Hsp27 and Arp2/3. Hsp27 also associates with the intermediate filament components vimentin and nestin. Thiolutin treatment specifically ablates Hsp27 interaction with nestin and collapses nestin filaments. These results provide new mechanistic insights into regulation of cell adhesion and cytoskeletal dynamics by Hsp27.Full Text Article
|Evidence that a protein kinase A substrate, small heat-shock protein 20, modulates myometrial relaxation in human pregnancy.|
Tyson, EK; Macintyre, DA; Smith, R; Chan, EC; Read, M
Endocrinology 149 6157-65 2008
For a successful human pregnancy, the phasic smooth muscle of the myometrium must remain quiescent until labor. Activation of cAMP/cAMP-dependent protein kinase A (PKA) pathways contributes to this quiescence. The small heat-shock protein 20 (HSP20) is a target of PKA, and phosphorylated HSP20 (pHSP20) modulates relaxation of tonic vascular smooth muscle via interaction with actin, independent of myosin dephosphorylation. Our objective was to determine whether relaxation in human myometrium is associated with changes in phosphorylation of HSP20. Myometrium was obtained at elective cesarean. Elevating cAMP with forskolin or rolipram (a phosphodiesterase inhibitor) caused substantial relaxation of spontaneously contracting human myometrial strips, of 92 +/- 4% (mean +/- sem, n = 10) and 84 +/- 7% (n = 6), respectively. Subsequent two-dimensional electrophoresis with immunoblotting of strip extracts showed a significant 2.6- and 2.1-fold increase in phosphorylated HSP20 (pHSP20) after forskolin (P less than 0.01; n = 5) or rolipram treatment (P less than 0.05; n = 4). Noncyclic-nucleotide-mediated relaxation, induced by the calcium channel blocker nifedipine, did not alter pHSP20. Inhibition of PKA with H89 significantly attenuated rolipram-induced relaxation (P less than 0.01; n = 4), and partially reduced rolipram-stimulated pHSP20. Total and pHSP20 protein was unchanged in term laboring and nonlaboring myometria. Coimmunoprecipitation studies revealed a specific association of HSP20 with alpha-smooth muscle actin and HSP27, a key regulator of actin filament dynamics. Finally, coimmunofluorescence demonstrated moderate colocalization of HSP20 with alpha-smooth muscle actin in the cytoplasm of laboring myometria. Our data support a novel role for pHSP20 in the modulation of cyclic-nucleotide-mediated myometrial relaxation, through interaction with actin. pHSP20 represents an important new target for future tocolytic therapy.
|The small heat shock-related protein, HSP20, is phosphorylated on serine 16 during cyclic nucleotide-dependent relaxation|
Beall, A., et al
J Biol Chem, 274:11344-51 (1999) 1999
|Prognostic significance of heat-shock protein-27 in node-positive breast carcinoma: an immunohistochemical study.|
Têtu, B, et al.
Breast Cancer Res. Treat., 36: 93-7 (1995) 1995
Immunostaining for heat-shock protein-27 (HSP-27) was performed on formalin fixed-paraffin embedded sections of 890 node-positive breast carcinomas resected between 1980 and 1986. The follow-up ranged from 2.5 to 10.5 years. A polyclonal antibody (Hu27, dilution: 1/200) was used. A positive cytoplasmic staining was obtained in 383 cases (43%). No difference in distant metastasis-free survival (DMFS) or overall survival (OS) was noted between cases with positive or negative immunostaining. This study suggests that HSP-27 expression is not predictive of the outcome in node-positive breast cancer.
|Modulation of cellular thermoresistance and actin filament stability accompanies phosphorylation-induced changes in the oligomeric structure of heat shock protein 27.|
Lavoie, J N, et al.
Mol. Cell. Biol., 15: 505-16 (1995) 1995
Phosphorylation of heat shock protein 27 (HSP27) can modulate actin filament dynamics in response to growth factors. During heat shock, HSP27 is phosphorylated at the same sites and by the same protein kinase as during mitogenic stimulation. This suggests that the same function of the protein may be activated during growth factor stimulation and the stress response. To determine the role of HSP27 phosphorylation in the heat shock response, several stable Chinese hamster cell lines that constitutively express various levels of the wild-type HSP27 (HU27 cells) or a nonphosphorylatable form of human HSP27 (HU27pm3 cells) were developed. In contrast to HU27 cells, which showed increased survival after heat shock, HU27pm3 cells showed only slightly enhanced survival. Evidence is presented that stabilization of microfilaments is a major target of the protective function of HSP27. In the HU27pm3 cells, the microfilaments were thermosensitized compared with those in the control cells, whereas wild-type HSP27 caused an increased stability of these structures in HU27 cells. HU27 but not HU27pm3 cells were highly resistant to cytochalasin D treatment compared with control cells. Moreover, in cells treated with cytochalasin D, wild-type HSP27 but not the phosphorylated form of HSP27 accelerated the reappearance of actin filaments. The mutations in human HSP27 had no effect on heat shock-induced change in solubility and cellular localization of the protein, indicating that phosphorylation was not involved in these processes. However, induction of HSP27 phosphorylation by stressing agents or mitogens caused a reduction in the multimeric size of the wild-type protein, an effect which was not observed with the mutant protein. We propose that early during stress, phosphorylation-induced conformational changes in the HSP27 oligomers regulate the activity of the protein at the level of microfilament dynamics, resulting in both enhanced stability and accelerated recovery of the filaments. The level of protection provided by HSP27 during heat shock may thus represent the contribution of better maintenance of actin filament integrity to overall cell survival.
|Heat shock resistance conferred by expression of the human HSP27 gene in rodent cells.|
Landry, J, et al.
J. Cell Biol., 109: 7-15 (1989) 1989
Heat shock induces in cells the synthesis of specific proteins called heat shock proteins (HSPs) and a transient state of thermotolerance. The putative role of one of the HSPs, HSP27, as a protective molecule during thermal stress has been directly assessed by measuring the resistance to hyperthermia of Chinese hamster and mouse cells transfected with the human HSP27 gene contained in plasmid pHS2711. One- and two-dimensional gel electrophoresis of [3H]leucine- and [32P]orthophosphate-labeled proteins, coupled with immunological analysis using Ha27Ab and Hu27Ab, two rabbit antisera that specifically recognize the hamster and the human HSP27 protein respectively, were used to monitor expression and inducibility of the transfected and endogenous proteins. The human HSP27 gene cloned in pHS2711 is constitutively expressed in rodent cells, resulting in accumulation of the human HSP27 and all phosphorylated derivatives. No modification of the basal or heat-induced expression of endogenous HSPs is detected. The presence of additional HSP27 protein provides immediate protection against heat shock administered 48 h after transfection and confers a permanent thermoresistant phenotype to stable transfectant Chinese hamster and mouse cell lines. Mild heat treatment of the transfected cells results in an induction of the full complement of the endogenous heat shock proteins and a small increase in thermoresistance, but the level attained did not surpass that of heat-induced thermotolerant control cells. These results indicate that elevated levels of HSP27 is sufficient to give protection from thermal killing. It is concluded that HSP27 plays a major role in the increased thermal resistance acquired by cells after exposure to HSP inducers.
|Dynamic changes in the structure and intracellular locale of the mammalian low-molecular-weight heat shock protein.|
Arrigo, A P, et al.
Mol. Cell. Biol., 8: 5059-71 (1988) 1988