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Article: Upregulation of erythropoietin and its receptor expression in the rat carotid body during chronic and intermittent hypoxia
Title | Upregulation of erythropoietin and its receptor expression in the rat carotid body during chronic and intermittent hypoxia |
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Authors | |
Keywords | Carotid body Chronic hypoxia Erythropoietin Intermittent hypoxia |
Issue Date | 2009 |
Publisher | Springer New York LLC. |
Citation | Advances In Experimental Medicine And Biology, 2009, v. 648, p. 207-214 How to Cite? |
Abstract | The carotid body (CB) plays important roles in cardiorespiratory changes in intermittent hypoxia (IH). Erythropoietin (EPO), a hypoxia-inducible factor (HIF)-1 target gene, is present in the chemoreceptive type-I cells in the CB but its expression and role in IH resembling sleep apnoeic conditions are not known. We hypothesized that IH upregulates the expression of EPO and its receptor (EPOr) in the rat CB. The CB expressions of EPO and EPOr were examined in rats breathing 10% O 2 (in isobaric chamber for CH, 24 hour/day) or in IH (cyclic between air and 5% O 2 per minute, 8 hour/day) for 3-28 days. Immunohistochemical studies revealed that the EPO and EPOr proteins were localized in CB glomic clusters. The proportional amount of cells with positive staining of EPO immunoreactivities was significantly increased in both IH and CH groups when compared with the normoxic control. The EPO expression was more markedly increased in the CH than that of the IH groups throughout the time course, reaching a peak level at day 14. The positive EPOr immunostaining was increased significantly in the 3-day CH group. By day 14, the EPOr expression elevated considerably at peak levels in both IH and CH rats, whereas the elevation was greater in the CH rats. These results suggest an upregulation of EPO and its receptor expression in the rat CB under IH and CH conditions, presumably mediated by the activation of HIF-1 pathway. The increased EPO binding to its receptor might play a role in the enhancement of CB excitability during the early pathogenesis in patients with sleep-disordered breathing. © Springer Science+Business Media B.V. 2009. |
Description | Proceeding of the XVIIth ISAC Meeting (International Society for Arterial Chemoreception Meeting), School of Medicine of Valladolid, Valladolid, Spain, July 1–5, 2008 |
Persistent Identifier | http://hdl.handle.net/10722/125338 |
ISSN | 2021 Impact Factor: 3.650 2023 SCImago Journal Rankings: 0.244 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lam, SY | en_HK |
dc.contributor.author | Tipoe, GL | en_HK |
dc.contributor.author | Fung, ML | en_HK |
dc.date.accessioned | 2010-10-31T11:25:28Z | - |
dc.date.available | 2010-10-31T11:25:28Z | - |
dc.date.issued | 2009 | en_HK |
dc.identifier.citation | Advances In Experimental Medicine And Biology, 2009, v. 648, p. 207-214 | en_HK |
dc.identifier.issn | 0065-2598 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/125338 | - |
dc.description | Proceeding of the XVIIth ISAC Meeting (International Society for Arterial Chemoreception Meeting), School of Medicine of Valladolid, Valladolid, Spain, July 1–5, 2008 | - |
dc.description.abstract | The carotid body (CB) plays important roles in cardiorespiratory changes in intermittent hypoxia (IH). Erythropoietin (EPO), a hypoxia-inducible factor (HIF)-1 target gene, is present in the chemoreceptive type-I cells in the CB but its expression and role in IH resembling sleep apnoeic conditions are not known. We hypothesized that IH upregulates the expression of EPO and its receptor (EPOr) in the rat CB. The CB expressions of EPO and EPOr were examined in rats breathing 10% O 2 (in isobaric chamber for CH, 24 hour/day) or in IH (cyclic between air and 5% O 2 per minute, 8 hour/day) for 3-28 days. Immunohistochemical studies revealed that the EPO and EPOr proteins were localized in CB glomic clusters. The proportional amount of cells with positive staining of EPO immunoreactivities was significantly increased in both IH and CH groups when compared with the normoxic control. The EPO expression was more markedly increased in the CH than that of the IH groups throughout the time course, reaching a peak level at day 14. The positive EPOr immunostaining was increased significantly in the 3-day CH group. By day 14, the EPOr expression elevated considerably at peak levels in both IH and CH rats, whereas the elevation was greater in the CH rats. These results suggest an upregulation of EPO and its receptor expression in the rat CB under IH and CH conditions, presumably mediated by the activation of HIF-1 pathway. The increased EPO binding to its receptor might play a role in the enhancement of CB excitability during the early pathogenesis in patients with sleep-disordered breathing. © Springer Science+Business Media B.V. 2009. | en_HK |
dc.language | eng | en_HK |
dc.publisher | Springer New York LLC. | - |
dc.relation.ispartof | Advances in Experimental Medicine and Biology | en_HK |
dc.rights | The original publication is available at www.springerlink.com | - |
dc.subject | Carotid body | en_HK |
dc.subject | Chronic hypoxia | en_HK |
dc.subject | Erythropoietin | en_HK |
dc.subject | Intermittent hypoxia | en_HK |
dc.subject.mesh | Anoxia - metabolism | - |
dc.subject.mesh | Carotid Body - drug effects - metabolism | - |
dc.subject.mesh | Erythropoietin - metabolism | - |
dc.subject.mesh | Receptors, Erythropoietin - metabolism | - |
dc.subject.mesh | Up-Regulation - drug effects | - |
dc.title | Upregulation of erythropoietin and its receptor expression in the rat carotid body during chronic and intermittent hypoxia | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0065-2598&volume=648&spage=207&epage=214&date=2009&atitle=Upregulation+of+erythropoietin+and+its+receptor+expression+in+the+rat+carotid+body+during+chronic+and+intermittent+hypoxia | en_HK |
dc.identifier.email | Tipoe, GL: tgeorge@hkucc.hku.hk | en_HK |
dc.identifier.email | Fung, ML: fungml@hkucc.hku.hk | en_HK |
dc.identifier.authority | Tipoe, GL=rp00371 | en_HK |
dc.identifier.authority | Fung, ML=rp00433 | en_HK |
dc.description.nature | postprint | - |
dc.identifier.doi | 10.1007/978-90-481-2259-2_24 | en_HK |
dc.identifier.pmid | 19536483 | - |
dc.identifier.scopus | eid_2-s2.0-67651211931 | en_HK |
dc.identifier.hkuros | 173740 | en_HK |
dc.identifier.hkuros | 160574 | - |
dc.identifier.hkuros | 188471 | - |
dc.identifier.hkuros | 188474 | - |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-67651211931&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 648 | en_HK |
dc.identifier.spage | 207 | en_HK |
dc.identifier.epage | 214 | en_HK |
dc.identifier.isi | WOS:000267288300024 | - |
dc.publisher.place | United States | en_HK |
dc.identifier.scopusauthorid | Lam, SY=7402279518 | en_HK |
dc.identifier.scopusauthorid | Tipoe, GL=7003550610 | en_HK |
dc.identifier.scopusauthorid | Fung, ML=7101955092 | en_HK |
dc.identifier.citeulike | 4923694 | - |
dc.identifier.issnl | 0065-2598 | - |