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Erythropoietin, a putative neurotransmitter during hypoxia, is produced in RVLM neurons and activates them in neonatal Wistar rats.
Oshima, Naoki; Onimaru, Hiroshi; Yamagata, Akira; Itoh, Seigo; Matsubara, Hidehito; Imakiire, Toshihiko; Nishida, Yasuhiro; Kumagai, Hiroo.
Afiliación
  • Oshima N; Department of Nephrology and Endocrinology, National Defense Medical College, Tokorozawa, Saitama , Japan.
  • Onimaru H; Department of Physiology, Showa University School of Medicine , Tokyo , Japan.
  • Yamagata A; Department of Nephrology and Endocrinology, National Defense Medical College, Tokorozawa, Saitama , Japan.
  • Itoh S; Department of Nephrology and Endocrinology, National Defense Medical College, Tokorozawa, Saitama , Japan.
  • Matsubara H; Department of Nephrology and Endocrinology, National Defense Medical College, Tokorozawa, Saitama , Japan.
  • Imakiire T; Department of Nephrology and Endocrinology, National Defense Medical College, Tokorozawa, Saitama , Japan.
  • Nishida Y; Department of Physiology, National Defense Medical College, Tokorozawa, Saitama , Japan.
  • Kumagai H; Department of Nephrology and Endocrinology, National Defense Medical College, Tokorozawa, Saitama , Japan.
Am J Physiol Regul Integr Comp Physiol ; 314(5): R700-R708, 2018 05 01.
Article en En | MEDLINE | ID: mdl-29443550
Recent studies indicate that erythropoietin (EPO) is present in many areas of the brain and is active in the restoration of impaired neurons. In this study, we examined the presence of EPO and its role in bulbospinal neurons in the rostral ventrolateral medulla (RVLM). Hypoxia is often accompanied by a high blood pressure (BP). We hypothesized that EPO is produced in response to hypoxia in RVLM neurons and then activates them. To investigate whether RVLM neurons are sensitive to EPO, we examined the changes in the membrane potentials (MPs) of bulbospinal RVLM neurons using the whole cell patch-clamp technique during superfusion with EPO. A brainstem-spinal cord preparation was used for the experiments. EPO depolarized the RVLM neurons, and soluble erythropoietin receptor (SEPOR), an antagonist of EPO, hyperpolarized them. Furthermore, hypoxia-depolarized RVLM neurons were significantly hyperpolarized by SEPOR. In histological examinations, the EPO-depolarized RVLM neurons showed the presence of EPO receptor (EPOR). The RVLM neurons that possessed EPORs showed the presence of EPO and hypoxia-inducible factor (HIF)-2α. We also examined the levels of HIF-2α and EPO messenger RNA (mRNA) in the ventral sites of the medullas (containing RVLM areas) in response to hypoxia. The levels of HIF-2α and EPO mRNA in the hypoxia group were significantly greater than those in the control group. These results suggest that EPO is produced in response to hypoxia in RVLM neurons and causes a high BP via the stimulation of those neurons. EPO may be one of the neurotransmitters produced by RVLM neurons during hypoxia.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Bulbo Raquídeo / Eritropoyetina / Neuronas Tipo de estudio: Etiology_studies Límite: Animals Idioma: En Revista: Am J Physiol Regul Integr Comp Physiol Asunto de la revista: FISIOLOGIA Año: 2018 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Bulbo Raquídeo / Eritropoyetina / Neuronas Tipo de estudio: Etiology_studies Límite: Animals Idioma: En Revista: Am J Physiol Regul Integr Comp Physiol Asunto de la revista: FISIOLOGIA Año: 2018 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Estados Unidos