Heat shock protein 70 could enhance porcine epidemic diarrhoea virus replication by interacting with membrane proteins
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ABSTRACT:
SUBMITTER: Park J
PROVIDER: S-EPMC8557036 | biostudies-literature |
REPOSITORIES: biostudies-literature
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Project description:Recent evidence supports a role for heat-shock protein 70 (hsp70) and the 26 S proteasome in regulating apoptosis, although the precise nature of their involvement is not known. In the present study, control and Bcl-x(L)-overexpressing, interleukin-3-dependent FL5.12 cell lines were treated with the proteasome inhibitor N-benzoyloxycarbonyl (Z)-Leu-Leu-leucinal (MG132). Basal proteasome activity appeared to be approximately 30% lower in bcl-x(L) cells compared with control cells using a substrate for the chymotrypsin-like activity. However, no difference in proteasome activity was detected using substrates for the trypsin-like or peptidylglutamyl peptide-hydrolysing activities. In addition, protein levels of the 20 S proteasome beta-subunit, as determined by Western blot analyses, were similar in control and bcl-x(L) cells, leading to the conclusion that proteasome activities were the same in these two cell lines. At 24 h after treatment with 500 nM MG132, apoptosis in bcl-x(L) cells (22%) was less than that observed in control cells (34%). Concomitantly, caspase activity in control cells, as assessed by N-acetyl-l-aspartyl-l-glutamyl-l-valyl-l-aspartyl-7-amino-4-methylcou marin (Ac-DEVD-AMC), was twice that observed in bcl-x(L) cells. By 48 h after MG132 treatment, apoptosis and caspase activity in bcl-x(L) cells were similar to those observed in control cells at 24 h. Proteasome inhibition stimulated increases in hsp70 protein levels in control and bcl-x(L) cells by 12 h, although the maximal increases found in bcl-x(L) cells were less. Blocking this induction with hsp70 antisense oligonucleotides potentiated apoptosis after treatment with MG132. Inhibiting caspase activity with a broad-spectrum caspase inhibitor, t-butoxycarbonyl-Asp(OMe)-fluoromethyl ketone, prevented MG132-induced apoptosis. The more specific caspase-3 inhibitor, Ac-DEVD-aldehyde, afforded less protection, although both inhibitors completely inhibited Ac-DEVD-AMC cleavage. These data indicate that both hsp70 and Bcl-x(L) provide some protection against proteasome inhibitor-induced apoptosis.
| S-EPMC1220666 | biostudies-other
Project description:Heat shock protein 70 (Hsp70) is a potent survival protein whose depletion triggers massive caspase-independent tumor cell death. Here, we show that Hsp70 exerts its prosurvival function by inhibiting lysosomal membrane permeabilization. The cell death induced by Hsp70 depletion was preceded by the release of lysosomal enzymes into the cytosol and inhibited by pharmacological inhibitors of lysosomal cysteine proteases. Accordingly, the Hsp70-mediated protection against various death stimuli in Hsp70-expressing human tumor cells as well as in immortalized Hsp70 transgenic murine fibroblasts occurred at the level of the lysosomal permeabilization. On the contrary, Hsp70 failed to inhibit the cytochrome c-induced, apoptosome-dependent caspase activation in vitro and Fas ligand-induced, caspase-dependent apoptosis in immortalized fibroblasts. Immunoelectron microscopy revealed that endosomal and lysosomal membranes of tumor cells contained Hsp70. Permeabilization of purified endo/lysosomes by digitonin failed to release Hsp70, suggesting that it is physically associated with the membranes. Finally, Hsp70 positive lysosomes displayed increased size and resistance against chemical and physical membrane destabilization. These data identify Hsp70 as the first survival protein that functions by inhibiting the death-associated permeabilization of lysosomes.
| S-EPMC2211935 | biostudies-literature
Project description:Immunization of mice with a 14-mer peptide TKDNNLLGRFELSG, termed "TKD," comprising amino acids 450-461 (aa(450-461)) in the C terminus of inducible Hsp70, resulted in the generation of an IgG1 mouse mAb cmHsp70.1. The epitope recognized by cmHsp70.1 mAb, which has been confirmed to be located in the TKD sequence by SPOT analysis, is frequently detectable on the cell surface of human and mouse tumors, but not on isogenic cells and normal tissues, and membrane Hsp70 might thus serve as a tumor-specific target structure. As shown for human tumors, Hsp70 is associated with cholesterol-rich microdomains in the plasma membrane of mouse tumors. Herein, we show that the cmHsp70.1 mAb can selectively induce antibody-dependent cellular cytotoxicity (ADCC) of membrane Hsp70(+) mouse tumor cells by unstimulated mouse spleen cells. Tumor killing could be further enhanced by activating the effector cells with TKD and IL-2. Three consecutive injections of the cmHsp70.1 mAb into mice bearing CT26 tumors significantly inhibited tumor growth and enhanced the overall survival. These effects were associated with infiltrations of NK cells, macrophages, and granulocytes. The Hsp70 specificity of the ADCC response was confirmed by preventing the antitumor response in tumor-bearing mice by coinjecting the cognate TKD peptide with the cmHsp70.1 mAb, and by blocking the binding of cmHsp70.1 mAb to CT26 tumor cells using either TKD peptide or the C-terminal substrate-binding domain of Hsp70.
| S-EPMC3021082 | biostudies-literature
Project description:We evaluated the heat shock system 70 (HSP70) in patients with chronic glomerulonephritis (CGN). Seventy-six patients with CGN patients were included in our study. Ten patients with mild proteinuria (median 0.48 [0.16-0.78] g/24 h) and ten healthy subjects served as positive and negative controls, respectively. Urinary levels of HSP70, interleukin-10, and serum levels of anti-HSP70 were measured by ELISA. The immunohistochemical peroxidase method was used to study the expression of HSP70 and Foxp3+ in kidney biopsies. TregFoxP3+ cells in the interstitium were determined morphometrically. Median urinary HSP70 levels in patients with nephrotic syndrome (NS) [6.57 (4.49-8.33) pg/mg] and subnephrotic range proteinuria [5.7 (4.12-6.9) pg/mg] were higher (p?<?0.05) than in positive [3.7 (2.5-4.82) pg/mg] and negative [3.78 (2.89-4.84) pg/mg] controls. HSP70 expression index in tubular cells positively correlated with urinary HSP70 (Rs?=?0.948, ??<?0.05) and proteinuria (Rs?=?0.362, p?<?0.05). The number of TregFoxp3+ cells in the kidney interstitium and interleukin-10 excretion were lower in patients with NS. Anti-HSP70 antibody serum levels in patients with NS [21.1 (17.47-29.72) pg/ml] and subnephrotic range proteinuria [24.9 (18.86-30.92) pg/ml] were significantly higher than in positive [17.8 (12.95-23.03) pg/ml] and negative [18.9 (13.5-23.9) pg/ml] controls. In patients with CGN, increasing proteinuria was associated with higher HSP70 renal tissue and urinary levels. However, activation of HSP70 in patients with nephrotic syndrome did not lead to an increase in tissue levels of TregFoxp3+ cells or to the release of IL-10.
| S-EPMC6237676 | biostudies-literature
Project description:Regulation of connexin43 (Cx43) expression affects cell proliferation, differentiation and apoptosis in a gap junctional intercellular communication (GJIC)-independent manner. However, the underlying mechanisms of Cx43-mediated cell cycle suppression are still poorly understood. To elucidate the molecular mechanism of Cx43-mediated cell cycle suppression, we searched for Cx43 interacting proteins by using a proteomics approach. Here, we have identified a Cx43-interacting protein, heat shock cognate protein 70 (Hsc70). We confirmed that Hsc70 directly binds to the C-terminus of Cx43, whereas Hsc54, a splice variant of Hsc70, does not, that Cx43 competes with cyclin D1 for binding to Hsc70, and that the nuclear accumulation of cyclin D1 is reduced by overexpression of Cx43 in a GJIC-independent manner, which is restored by co-overexpression with Hsc70. As a result, the cell proliferation is regulated by Cx43. Our results suggest that Cx43-Hsc70 interaction probably plays a critical role during G1/S progression.
| S-EPMC3779846 | biostudies-other
Project description:Tylophorine analogs have been shown to exhibit diverse activities against cancer, inflammation, arthritis, and lupus in vivo. In this study, we demonstrated that two tylophorine analogs, DCB-3503 and rac-cryptopleurine, exhibit potent inhibitory activity against hepatitis C virus (HCV) replication in genotype 1b Con 1 isolate. The inhibition of HCV replication is at least partially mediated through cellular heat shock cognate protein 70 (Hsc70). Hsc70 associates with the HCV replication complex by primarily binding to the poly U/UC motifs in HCV RNA. The interaction of DCB-3503 and rac-cryptopleurine with Hsc70 promotes the ATP hydrolysis activity of Hsc70 in the presence of the 3' poly U/UC motif of HCV RNA. Regulating the ATPase activity of Hsc70 may be one of the mechanisms by which tylophorine analogs inhibit HCV replication. This study demonstrates the novel anti-HCV activity of tylophorine analogs. Our results also highlight the importance of Hsc70 in HCV replication.
| S-EPMC5577180 | biostudies-literature
Project description:Porcine epidemic diarrhea (PED) is an enteric disease in swine caused by an alphacoronavirus. It affects swine of all ages causing acute diarrhoea and can lead to severe dehydration and death in suckling piglets. Being recognized for the first time in Europe and Asia during the seventies and the eighties, respectively, it has remained a relevant cause of diarrhea outbreaks in Asia for years and to the present. It has become a major concern in swine production since 2013 when the virus was detected for first time in the USA and in other American countries causing a high number of pig deaths and significant economic losses. The present review aims at approaching the reader to the state of the art of PED giving answer to some of the most recent questions which have arisen related to this disease.
| S-EPMC5382377 | biostudies-literature
Project description:Ovarian cancer (OvCa) is the most lethal gynecologic malignancy owing to its high chemoresistance and late diagnosis, which lead to a poor prognosis. Hence, developing new therapeutic modalities is important for OvCa patient treatment. Our previous results indicated that a novel aptamer, Tx-01, can specifically recognize serous carcinoma cells and tissues. Here, we aim to clarify the clinical role and possible molecular mechanisms of Tx-01 in OvCa. Immunostaining and statistical analysis were performed to detect the interaction of Tx-01 and heat shock protein 70/Notch1 intracellular domain (HSP70/NICD) in OvCa. The in vitro and in vivo experiments were carried out to demonstrate the potential mechanisms of Tx-01. Results show that Tx-01 reduced serous OvCa OVCAR3 cell migration and invasion and inhibited HSP70 nuclear translocation by interrupting the intracellular HSP70/NICD interaction. Furthermore, Tx-01 suppressed serous-type OVCAR3 cell tumor growth in vivo. Tx-01 acts as a prognostic factor through its interaction with membrane-bound HSP70 (mHSP70 that locates on the cell surface without direct interaction to NICD) on ascitic circulating tumor cells (CTCs) and is reported to be involved in natural killer (NK) cell recognition and activation. Our data demonstrated that Tx-01 interacted with HSP70 and showed therapeutic and prognostic effects in serous OvCa. Tx-01 might be a potential inhibitor for use in serous OvCa treatment.
| S-EPMC7868721 | biostudies-literature
Project description:As an emerging disease, the porcine epidemic diarrhoea virus has caused substantial economic losses to the pork industry in Mexico, leading to piglet mortality rates of up to 100%. For detection, sequencing and genetic characterization of the virus, 68 samples of one-week-old piglets from pork farms in 17 states of Mexico were analysed. In total, 53 samples were positive by real-time RT-PCR, confirming the presence of the virus in 15 states. Twenty-eight samples from 10 states were amplified by endpoint RT-PCR, and 20 sequences of the spike gene were obtained. A phylogenetic analysis based on the spike gene demonstrated that all Mexican strains are in Group II and are classified as non-Indel-S emerging variants. Three strains showed amino acid insertions: PEDv/MEX/GTO/LI-DMZC15/2015 and PEDv/MEX/QRO/LI-DMZC45/2016 showed one amino acid insertion (424 Y425 and 447 D448 , respectively), and PEDv/MEX/QRO/LI-DMZC49/2019 showed one and two amino acid insertions (422 C423 and 537 SQ538 ), with the second insertion in the COE region. These results provide evidence of the prevalence of emerging, non-Indel-S strains of the virus are currently circulating in Mexico during 2016-2018, when three of which have amino acid insertions: PEDv/MEX/GTO/IN-DMZC15/2015 and PEDv/MEX/QRO/IN-DMZC45/2016 have one amino acid insertion each (424 Y425 and 447 D448 , respectively), and PEDv/MEX/QRO/IN-DMZC49/2019 has one (422 C423 ) and two amino acid insertions (537 SQ538 ), the latter being in the COE region, which could generate new antigenic variants.
| S-EPMC7159366 | biostudies-literature
Project description:Porcine epidemic diarrhoea (PED) is a highly contagious and devastating enteric disease of pigs caused by porcine epidemic diarrhoea virus (PEDV), an enveloped, single-stranded RNA virus belonging to the Alphacoronavirus genus of the Coronaviridae family. The disease is clinically similar to other forms of porcine gastroenteritis. Pigs are the only known host of the disease, and the occurrence of PED in wild boars is unknown. The virus causes acute diarrhoea, vomiting, dehydration, and high mortality in suckling piglets reaching 100%. Heavy economic losses in the pig-farming industry were sustained in the USA between 2013 and 2015 when PEDV spread very quickly and resulted in epidemics. The loss in the US pig industry has been estimated at almost seven million pigs. The purpose of this review is a description of the current status of porcine epidemic diarrhoea in European pigs and the risk presented by the introduction of PEDV to Poland in comparison to the epidemics in the USA.
| S-EPMC6950429 | biostudies-literature