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1.
Erythropoietin regulates hypoxic ventilation in mice by interacting with brainstem and carotid bodies 总被引:1,自引:1,他引:1
Jorge Soliz Vincent Joseph Christophe Soulage Csilla Becskei Johannes Vogel Jean Marc Pequignot Omolara Ogunshola Max Gassmann 《The Journal of physiology》2005,568(2):559-571
Apart from its role in elevating red blood cell number, erythropoietin (Epo) exerts protective functions in brain, retina and heart upon ischaemic injury. However, the physiological non-erythroid functions of Epo remain unclear. Here we use a transgenic mouse line (Tg21) constitutively overexpressing human Epo in brain to investigate Epo's impact on ventilation upon hypoxic exposure. Tg21 mice showed improved ventilatory response to severe acute hypoxia and moreover improved ventilatory acclimatization to chronic hypoxic exposure. Furthermore, following bilateral transection of carotid sinus nerves that uncouples the brain from the carotid body, Tg21 mice adapted their ventilation to acute severe hypoxia while chemodenervated wild-type (WT) animals developed a life-threatening apnoea. These results imply that Epo in brain modulates ventilation. Additional analysis revealed that the Epo receptor (EpoR) is expressed in the main brainstem respiratory centres and suggested that Epo stimulates breathing control by alteration of catecholaminergic metabolism in brainstem. The modulation of hypoxic pattern of ventilation after i.v. injection of recombinant human Epo in WT mice and the dense EpoR immunosignal observed in carotid bodies showed that these chemoreceptors are sensitive to plasma levels of Epo. In summary, our results suggest that Epo controls ventilation at the central (brainstem) and peripheral (carotid body) levels. These novel findings are relevant to understanding better respiratory disorders including those occurring at high altitude. 相似文献
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Zsolt Kanyári Dóra Cservenyák Béla Tankó Balázs Nemes Béla Fülesdi Csilla Molnár 《Transplantation proceedings》2021,53(5):1402-1408
ObjectivesThe aim of the present work was to assess the knowledge and attitudes of different health care workers and laypeople toward the donation and transplantation procedure.Subjects and methodsA survey consisting of questions regarding brain death diagnosis, legal organization or organ donation, and the transplantation procedure were sent to participants: 56 intensive care unit (ICU) doctors, 76 ICU nurses, 188 sixth-year medical students, and 320 general practitioners (GPs). Laypeople were also asked to complete the survey.ResultsThe majority of participants reported being aware of legal regulations for organ donation in Hungary (88.5%). Roughly 25% of GPs and 60% of laypeople were unaware of the opt-out system effective in the country. Less than one-third of ICU physicians (26.9%) and nurses (34.7%) were able to list the organs that may be transplanted from a deceased donor; GPs (22.4%) and medical students (20%) performed even worse on this item. The willingness of ICU specialists (57%) and ICU nurses (45%) to support donating their own organs was moderate.ConclusionsThe results of this survey indicate a need for graduate and postgraduate education and regular teaching programs regarding organ donation and transplantation. More active use of modern media is proposed to improve public awareness and acceptance of organ donation. 相似文献
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Nonsyndromic Early‐Onset Cone‐Rod Dystrophy and Limb‐Girdle Muscular Dystrophy in a Consanguineous Israeli Family are Caused by Two Independent yet Linked Mutations in ALMS1 and DYSF 下载免费PDF全文
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Faisal Karmali Csilla Haburcakova Wangsong Gong Charles C. Della Santina Daniel M. Merfeld Richard F. Lewis 《The Journal of neuroscience》2021,41(17):3879
Gravity is a pervasive environmental stimulus, and accurate graviception is required for optimal spatial orientation and postural stability. The primary graviceptors are the vestibular organs, which include angular velocity (semicircular canals) and linear acceleration (otolith organs) sensors. Graviception is degraded in patients with vestibular damage, resulting in spatial misperception and imbalance. Since minimal therapy is available for these patients, substantial effort has focused on developing a vestibular prosthesis or vestibular implant (VI) that reproduces information normally provided by the canals (since reproducing otolith function is very challenging technically). Prior studies demonstrated that angular eye velocity responses could be driven by canal VI-mediated angular head velocity information, but it remains unknown whether a canal VI could improve spatial perception and posture since these behaviors require accurate estimates of angular head position in space relative to gravity. Here, we tested the hypothesis that a canal VI that transduces angular head velocity and provides this information to the brain via motion-modulated electrical stimulation of canal afferent nerves could improve the perception of angular head position relative to gravity in monkeys with severe vestibular damage. Using a subjective visual vertical task, we found that normal female monkeys accurately sensed the orientation of the head relative to gravity during dynamic tilts, that this ability was degraded following bilateral vestibular damage, and improved when the canal VI was used. These results demonstrate that a canal VI can improve graviception in vestibulopathic animals, suggesting that it could reduce the disabling perceptual and postural deficits experienced by patients with severe vestibular damage.SIGNIFICANCE STATEMENT Patients with vestibular damage experience impaired vision, spatial perception, and balance, symptoms that could potentially respond to a vestibular implant (VI). Anatomic features facilitate semicircular canal (angular velocity) prosthetics but inhibit approaches with the otolith (linear acceleration) organs, and canal VIs that sense angular head velocity can generate compensatory eye velocity responses in vestibulopathic subjects. Can the brain use canal VI head velocity information to improve estimates of head orientation (e.g., head position relative to gravity), which is a prerequisite for accurate spatial perception and posture? Here we show that a canal VI can improve the perception of head orientation in vestibulopathic monkeys, results that are highly significant because they suggest that VIs mimicking canal function can improve spatial orientation and balance in vestibulopathic patients. 相似文献
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Arredi B Ferlin A Speltra E Bedin C Zuccarello D Ganz F Marchina E Stuppia L Krausz C Foresta C 《Journal of medical genetics》2007,44(3):205-208