Sublethal heat shock and cyclosporine exposure produce tolerance against subsequent cyclosporine toxicity

1996 ◽  
Vol 271 (3) ◽  
pp. F571-F578 ◽  
Author(s):  
C. M. Yuan ◽  
E. M. Bohen ◽  
F. Musio ◽  
M. A. Carome
Keyword(s):  
Gene Expression ◽  
Heat Shock ◽  
Heat Shock Protein ◽  
Cyclosporine A ◽  
Heat Shock Protein 70 ◽  
Lethal Dose ◽  
Atp Depletion ◽  
Hsp 70 ◽  
Protein Levels ◽  
Toxic Concentration

Sublethal heat shock has been shown to produce tolerance in cells and tissues subsequently exposed to heat or ischemia/ATP depletion. We tested whether heating LLC-PK1 cells for 2 h at 42 degrees C induced heat shock protein-70 (HSP-70) gene expression and conferred tolerance against subsequent cyclosporine A (CyA) toxicity. HSP-70 mRNA was increased immediately after heat shock, returning to baseline by 4 h. HSP-70 protein increased by 1 h after heat shock and declined thereafter, approaching baseline after 72 h. Cells heat shocked at 4 and 24 h prior to CyA exposure were significantly more viable than controls, at CyA concentrations near the median lethal dose (LD50). Cytoprotection declined with time after heat shock, concurrent with declining HSP-70 protein levels. Sublethal CyA exposure (50 micrograms/ml) for 24 h produced upregulation of HSP-70 mRNA and protein. Pretreatment with 50 micrograms/ml CyA for 24 h followed by exposure to a toxic concentration of CyA (200 micrograms/ml) produced significant cytoprotection compared with untreated controls. In conclusion, HSP-70 protein induction by sublethal heat shock or CyA exposure was associated with tolerance against subsequent lethal CyA exposure.

Leptin downregulates heat shock protein-70 (HSP-70) gene expression in chicken liver and hypothalamus

2007 ◽  
Vol 329 (1) ◽  
pp. 91-101 ◽  
Author(s):  
Denise Figueiredo ◽  
Arieh Gertler ◽  
Gérard Cabello ◽  
Eddy Decuypere ◽  
Johan Buyse ◽  
...  
Keyword(s):  
Gene Expression ◽  
Heat Shock ◽  
Heat Shock Protein ◽  
Heat Shock Protein 70 ◽  
Chicken Liver ◽  
Hsp 70

scholarly journals Heat Shock Protein 70 Improves In Vitro Embryo Yield and Quality from Heat Stressed Bovine Oocytes

Animals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1794
Author(s):  
Konstantina Stamperna ◽  
Themistoklis Giannoulis ◽  
Eleni Dovolou ◽  
Maria Kalemkeridou ◽  
Ioannis Nanas ◽  
...  
Keyword(s):  
Gene Expression ◽  
Heat Shock ◽  
Heat Shock Protein ◽  
Heat Shock Protein 70 ◽  
Cumulus Cells ◽  
Intramolecular Interactions ◽  
Developmental Competence ◽  
Embryo Yield ◽  
Bovine Oocytes

Heat shock protein 70 (HSP70) is a chaperon that stabilizes unfolded or partially folded proteins, preventing inappropriate inter- and intramolecular interactions. Here, we examined the developmental competence of in vitro matured oocytes exposed to heat stress with or without HSP70. Bovine oocytes were matured for 24 h at 39 °C without (group C39) or with HSP70 (group H39) and at 41 °C for the first 6 h, followed by 16 h at 39 °C with (group H41) or without HSP70 (group C41). After insemination, zygotes were cultured for 9 days at 39 °C. Cleavage and embryo yield were assessed 48 h post insemination and on days 7, 8, 9, respectively. Gene expression was assessed by RT-PCR in oocytes, cumulus cells and blastocysts. In C41, blastocysts formation rate was lower than in C39 and on day 9 it was lower than in H41. In oocytes, HSP70 enhanced the expression of three HSP genes regardless of incubation temperature. HSP70 at 39 °C led to tight coordination of gene expression in oocytes and blastocysts, but not in cumulus cells. Our results imply that HSP70, by preventing apoptosis, supporting signal transduction, and increasing antioxidant protection of the embryo, protects heat stressed maturing bovine oocyte and restores its developmental competence.

Expression of prostaglandin G/H synthase (PGHS) and heat shock protein-70 (HSP-70) in the corpus luteum (CL) of prostaglandin F2α-treated immature superovulated rats

2004 ◽  
Vol 82 (6) ◽  
pp. 363-371 ◽  
Author(s):  
R M Narayansingh ◽  
M Senchyna ◽  
M M Vijayan ◽  
J C Carlson
Keyword(s):  
Heat Shock ◽  
Heat Shock Protein ◽  
Protein Expression ◽  
Corpus Luteum ◽  
Heat Shock Protein 70 ◽  
Prostaglandin F2α ◽  
Sampling Period ◽  
Immunoblot Analysis ◽  
Hsp 70 ◽  
Prostaglandin F

In this study we examined the mechanism of corpus luteum (CL) regression by measuring changes in expression of prostaglandin G/H synthase-1 (PGHS-1) and -2 (PGHS-2) in day 4 CL and inducible heat shock protein 70 (HSP-70) in day 4 and day 9 CL of immature superovulated rats. The rats were superovulated and treated with 500 µg of prostaglandin F2α (PGF2α) on day 4 or day 9 after CL formation. Ovaries and serial blood samples were removed during the 24-hour period following treatment. Plasma progesterone was determined by radioimmunoassay while mRNA abundance and protein expression were assessed by semiquantitative RT-PCR and immunoblot analysis, respectively. One hour after PGF2α, both day 4 and day 9 rats exhibited a significant decrease in progesterone secretion; however, there was a greater decrease in day 9 rats. In ovarian samples removed on day 4, there was a significant increase in mRNA for PGHS-2 at 1 hour after PGF2α. PGHS-1 mRNA content remained unchanged. Immunoblot analyses showed an increase in PGHS-2 protein expression only at 8 h. There were no changes in PGHS-1 protein expression. In day 9 rats, ovarian HSP-70 protein levels increased by 50% after PGF2α injection; however, on day 4 there was no change in expression of this protein over the sampling period. These results suggest that expression of PGHS-2 may be involved in inhibiting progesterone production and that expression of HSP-70 may be required for complete CL regression in the rat.Key words: rat, prostaglandin F2α, corpus luteum, prostaglandin G/H synthase, heat shock protein-70.

scholarly journals Επικεκαλυμμένες ενδαγγειακές προθέσεις και επαναστένωση μετά από αγγειοπλαστική

2014 ◽  
Author(s):  
Δημήτριος Λυσίτσας
Keyword(s):  
Heat Shock ◽  
Heat Shock Protein ◽  
Heat Shock Protein 70 ◽  
Low Dose ◽  
High Dose ◽  
Hsp 70

Εισαγωγή: Η υπερπλασία του έσω χιτώνα παίζει μείζων ρόλο στην επαναστένωση (in-stentrestenosis). Στην παρούσα μελέτη αξιολογήσαμε in vitro την επίδραση της D-24851(κυτταροτοξική ουσία που σταματά τον κυτταρικό κύκλο στο στάδιο G2-M) στονπολλαπλασιασμό των λείων μυϊκών κυττάρων και μελετήσαμε την ασφάλεια και τηνδραστικότητα μίας ενδαγγειακής πρόθεσης (stent) επικαλυμμένης με πολυμερή ουσία πουαπελευθερώνει την D-24851, στην αναστολή της υπερπλασίας του έσω χιτώνα χωρίς ναεμποδίζει την αναγεννητική ικανότητα του ενδοθηλίου σε in vivo πειραματικό μοντέλο.Υλικό και Μέθοδοι: Γυμνά μεταλλικά stent (n=6), stent επικαλυμμένα μόνο με πολυμερήουσία (polymer-coated, n=7) και stent επικαλυμμένα με πολυμερή ουσία πουαπελευθερώνουν 31±1μg (low-dose, n=7), 216±8 μg (high-dose, n=6) ή 1774±39 μg(extreme-dose, n=5) της D-24851 εμφυτεύτηκαν στις μηριαίες αρτηρίες λευκών New Zealandκουνελιών. Τα πειραματόζωα θυσιάστηκαν στις 28 ημέρες για ιστομορφομετρική ανάλυση.Για την αξιολόγηση της ενδοθηλιακής αναγέννησης στις 90 ημέρες, 12 πειραματόζωαχρησιμοποιήθηκαν για την τοποθέτηση polymer-coated (n=3), low dose (n=3), high dose(n=3) or extreme dose (n=3) ενδαγγειακών προθέσεων.Αποτελέσματα: In vitro η D-24851 αναστέλλει την υπερπλασία των λείων μυϊκών κυττάρωνκαι επάγει την απόπτωση τους χωρίς να αυξάνει την επαγωγή της heat shock protein 70(HSP-70), μία κυτταροπροστατευτική και αντι-αποπτωτική πρωτεΐνη. Η θεραπεία με lowdoseD-24851 stents συνδυάστηκε με 38% (P=0.029) μείωση της υπερπλαστικής περιοχήςτου έσω χιτώνα και 35% (P=0.003) μείωση της επι τοις εκατό στένωσης του αυλού σεσύγκριση με τα γυμνά μεταλλικά stents. Ο τραυματισμός και η φλεγμονή του αρτηριακού τοιχώματος δεν παρουσίασαν σημαντικές διαφορές μεταξύ των ομάδων. Τα επικαλυμμέναμόνο με πολυμερή ουσία stents εμφάνισαν παρόμοια ανάπτυξη νεοιστού σε σύγκριση με ταγυμνά μεταλλικά stents. Ωστόσο, όλες οι ομάδες των stents με D-24851 παρουσίασαν ατελήενδοθηλιοποίηση συγκρινόμενα με τα polymer-coated stents.Συμπεράσματα: Οι επικεκαλυμμένες ενδαγγειακές προσθέσεις με πολυμερή ουσία καιχαμηλη δόση D-24851 μειώνουν σημαντικά την υπερπλασιά του έσω χιτώνα. Λόγω τηςατελούς ενδοθηλιοποίησης, μακράς διάρκειας μελέτες είναι απαραίτητες για ναπιστοποιήσουν ότι η αναστολή του νεοιστού παραμένει και μετά τις 28 ημέρες.

scholarly journals PERUBAHAN EKSPRESI HEAT SHOCK PROTEIN 70 AKIBAT PAPARAN MEDAN ELEKTROMAGNETIK EXTREMELY LOW FREQUENCY PADA MAKROFAG PERITONEUM MENCIT YANG DIINFEKSI Toxoplasma gondii

Biomedika ◽  
2015 ◽  
Vol 7 (2) ◽  
Author(s):  
Mochammad Arief Taufiqurochman
Keyword(s):  
Heat Shock ◽  
Toxoplasma Gondii ◽  
Heat Shock Protein ◽  
Heat Shock Protein 70 ◽  
Low Frequency ◽  
T Test ◽  
Control Group ◽  
Hsp 70 ◽  
Extremely Low Frequency ◽  
Promotor Region

Penelitian dilakukan untuk mengetahui efek paparan medan elektromagnetik ELF sebesar 100 μT 8 jam/ hari selama 2 dan 4 minggu terhadap ekspresi HSP 70 makrofag peritoneum mencit yang diinfeksi dengan Toxoplasma gondii. Jenis penelitian ini adalah Eksperimen Biomedik menggunakan rancangan randomized separate posttest control group designdengan hewan coba mencit strain Balb/c, melalui pengamatan ekspresi HSP 70 , terdiri dari 3 kelompok kontrol dan 4 kelompok perlakuan, tiap kelompok terdiri dari 4 hewan coba. Pengamatan jaringan menggunakan metode imunohistokimia indirek, hasilnya dianalisis menggunakan uji statistik Independent t-test antar kelompok setelah dilakukan uji homogenitas dan normalitas data penelitian ( α=0.05). Hasil penelitian menunjukkan bahwa akibat paparanME ELF dengan itensitas 100 μT selama 2 minggu belum mampu melemahkan atau memutus rantai DNA gen HSP 70 promotor region tetapi menimbulkan stres seluler yang berakibat teraktifasinya HSF 1 melalui konversi menjadi trimer yang akan meregulasi secara cepat sintesis HSP 70 . Paparan medan elektromegnetik ME ELF selama 4 minggu dapat melemahkan bahkan memutus rantai DNA hsp 70 promotor region, sehingga sintesis HSP akan terhambat secara signifikan (p<0.05). Terdapat peningkatan secara signifikan ekspresi HSP 70 makrofag peritoneum mencit yang terpapar ME ELF dengan itensitas 100 μT selama 2 minggu pada kelompok yang terinfeksi toxoplasma gondii dan terjadi penurunan secara signifikan ekspresi HSP 70 pada kelompok terpapar ME ELF selama4 minggu pada kelompok yang terinfeksi Toxoplasma gondi dibandingkan dengan konrol.Kata Kunci: Medan Electromagnetik ELF, HSP 70, Makrofag, Toxoplasma gondii.

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