Elevated levels of extracellular heat-shock protein 72 (eHSP72) are positively correlated with insulin resistance in vivo and cause pancreatic ß-cell dysfunction and death in vitro.
eHSP72 (extracellular heat-shock protein 72) is increased in the plasma of both types of diabetes and is positively correlated with inflammatory markers. Since aging is associated with a low-grade inflammation and IR (insulin resistance), we aimed to: (i) analyse the concentration of eHSP72 in elder...
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| Format: | Journal Article |
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Portland Press Ltd.
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/26347 |
| _version_ | 1848751960993300480 |
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| author | Krause, M. Keane, Kevin Rodrigues-Krause, J. Crognale, D. Egan, B. De Vito, G. Murphy, C. Newsholme, Philip |
| author_facet | Krause, M. Keane, Kevin Rodrigues-Krause, J. Crognale, D. Egan, B. De Vito, G. Murphy, C. Newsholme, Philip |
| author_sort | Krause, M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | eHSP72 (extracellular heat-shock protein 72) is increased in the plasma of both types of diabetes and is positively correlated with inflammatory markers. Since aging is associated with a low-grade inflammation and IR (insulin resistance), we aimed to: (i) analyse the concentration of eHSP72 in elderly people and determine correlation with insulin resistance, and (ii) determine the effects of eHSP72 on ß-cell function and viability in human and rodent pancreatic ß-cells. Fasting blood samples were collected from 50 older people [27 females and 23 males; 63.4±4.4 years of age; BMI (body mass index)=25.5±2.7 kg/m2]. Plasma samples were analysed for eHSP72, insulin, TNF (tumour necrosis factor)- α, leptin, adiponectin and cortisol, and glycaemic and lipid profile. In vitro studies were conducted using rodent islets and clonal rat and human pancreatic ß-cell lines (BRIN-BD11 and 1.1B4 respectively). Cells/islets were incubated for 24 h with eHSP72 (0, 0.2, 4, 8 and 40 ng/ml). Cell viability was measured using three different methods. The impact of HSP72 on ß-cell metabolic status was determined using Seahorse Bioscience XFe96 technology.To assess whether the effects of eHSP72 were mediated by Toll-like receptors (TLR2/TLR4), we co-incubated rodent islets with eHSP72 and the TLR2/TLR4 inhibitor OxPAPC (oxidized 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine; 30 µg/ml). We found a positive correlation between plasma eHSP72 and HOMA-IR (homoeostasis model assessment of IR) (r=0.528, P<0.001), TNF-a (r=0.389, P<0.014), cortisol (r=0.348, P<0.03) and leptin/adiponectin (r=0.334, P<0.03). In the in vitro studies, insulin secretion was decreased in an eHSP72 dose-dependent manner in BRIN-BD11 cells (from 257.7±33 to 84.1±10.2 µg/mg of protein per 24 h with 40 ng/ml eHSP72), and in islets in the presence of 40 ng/ml eHSP72 (from 0.48±0.07 to 0.33±0.009 µg/20 islets per 24 h). Similarly, eHSP72 reduced ß-cell viability (at least 30% for BRIN-BD11 and 10% for 1.1B4 cells). Bioenergetic studies revealed that eHSP72 altered pancreatic ß-cell metabolism. OxPAPC restored insulin secretion in islets incubated with 40 ng/ml eHSP72. In conclusion, we have demonstrated a positive correlation between eHSP72 and IR. In addition, we suggest that chronic eHSP72 exposure may mediate ß-cell failure. |
| first_indexed | 2025-11-14T08:01:02Z |
| format | Journal Article |
| id | curtin-20.500.11937-26347 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:01:02Z |
| publishDate | 2013 |
| publisher | Portland Press Ltd. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-263472017-09-13T15:26:48Z Elevated levels of extracellular heat-shock protein 72 (eHSP72) are positively correlated with insulin resistance in vivo and cause pancreatic ß-cell dysfunction and death in vitro. Krause, M. Keane, Kevin Rodrigues-Krause, J. Crognale, D. Egan, B. De Vito, G. Murphy, C. Newsholme, Philip Type 1 diabetes extracellular heat-shock protein 72 (eHSP72) Type 2 diabetes pancreatic ß-cell insulin resistance aging eHSP72 (extracellular heat-shock protein 72) is increased in the plasma of both types of diabetes and is positively correlated with inflammatory markers. Since aging is associated with a low-grade inflammation and IR (insulin resistance), we aimed to: (i) analyse the concentration of eHSP72 in elderly people and determine correlation with insulin resistance, and (ii) determine the effects of eHSP72 on ß-cell function and viability in human and rodent pancreatic ß-cells. Fasting blood samples were collected from 50 older people [27 females and 23 males; 63.4±4.4 years of age; BMI (body mass index)=25.5±2.7 kg/m2]. Plasma samples were analysed for eHSP72, insulin, TNF (tumour necrosis factor)- α, leptin, adiponectin and cortisol, and glycaemic and lipid profile. In vitro studies were conducted using rodent islets and clonal rat and human pancreatic ß-cell lines (BRIN-BD11 and 1.1B4 respectively). Cells/islets were incubated for 24 h with eHSP72 (0, 0.2, 4, 8 and 40 ng/ml). Cell viability was measured using three different methods. The impact of HSP72 on ß-cell metabolic status was determined using Seahorse Bioscience XFe96 technology.To assess whether the effects of eHSP72 were mediated by Toll-like receptors (TLR2/TLR4), we co-incubated rodent islets with eHSP72 and the TLR2/TLR4 inhibitor OxPAPC (oxidized 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine; 30 µg/ml). We found a positive correlation between plasma eHSP72 and HOMA-IR (homoeostasis model assessment of IR) (r=0.528, P<0.001), TNF-a (r=0.389, P<0.014), cortisol (r=0.348, P<0.03) and leptin/adiponectin (r=0.334, P<0.03). In the in vitro studies, insulin secretion was decreased in an eHSP72 dose-dependent manner in BRIN-BD11 cells (from 257.7±33 to 84.1±10.2 µg/mg of protein per 24 h with 40 ng/ml eHSP72), and in islets in the presence of 40 ng/ml eHSP72 (from 0.48±0.07 to 0.33±0.009 µg/20 islets per 24 h). Similarly, eHSP72 reduced ß-cell viability (at least 30% for BRIN-BD11 and 10% for 1.1B4 cells). Bioenergetic studies revealed that eHSP72 altered pancreatic ß-cell metabolism. OxPAPC restored insulin secretion in islets incubated with 40 ng/ml eHSP72. In conclusion, we have demonstrated a positive correlation between eHSP72 and IR. In addition, we suggest that chronic eHSP72 exposure may mediate ß-cell failure. 2013 Journal Article http://hdl.handle.net/20.500.11937/26347 10.1042/CS20130678 Portland Press Ltd. restricted |
| spellingShingle | Type 1 diabetes extracellular heat-shock protein 72 (eHSP72) Type 2 diabetes pancreatic ß-cell insulin resistance aging Krause, M. Keane, Kevin Rodrigues-Krause, J. Crognale, D. Egan, B. De Vito, G. Murphy, C. Newsholme, Philip Elevated levels of extracellular heat-shock protein 72 (eHSP72) are positively correlated with insulin resistance in vivo and cause pancreatic ß-cell dysfunction and death in vitro. |
| title | Elevated levels of extracellular heat-shock protein 72 (eHSP72) are positively correlated with insulin resistance in vivo and cause pancreatic ß-cell dysfunction and death in vitro. |
| title_full | Elevated levels of extracellular heat-shock protein 72 (eHSP72) are positively correlated with insulin resistance in vivo and cause pancreatic ß-cell dysfunction and death in vitro. |
| title_fullStr | Elevated levels of extracellular heat-shock protein 72 (eHSP72) are positively correlated with insulin resistance in vivo and cause pancreatic ß-cell dysfunction and death in vitro. |
| title_full_unstemmed | Elevated levels of extracellular heat-shock protein 72 (eHSP72) are positively correlated with insulin resistance in vivo and cause pancreatic ß-cell dysfunction and death in vitro. |
| title_short | Elevated levels of extracellular heat-shock protein 72 (eHSP72) are positively correlated with insulin resistance in vivo and cause pancreatic ß-cell dysfunction and death in vitro. |
| title_sort | elevated levels of extracellular heat-shock protein 72 (ehsp72) are positively correlated with insulin resistance in vivo and cause pancreatic ß-cell dysfunction and death in vitro. |
| topic | Type 1 diabetes extracellular heat-shock protein 72 (eHSP72) Type 2 diabetes pancreatic ß-cell insulin resistance aging |
| url | http://hdl.handle.net/20.500.11937/26347 |