[PMID]: | 29288665 |
[Au] Autor: | Peoples JN; Taylor DG; Katchman AN; Ebert SN |
[Ad] Endereço: | Burnett School of Biomedical Sciences, Division of Metabolic and Cardiovascular Sciences, College of Medicine, University of Central Florida, 6900 Lake Nona Blvd, Orlando, FL 32827, United States. |
[Ti] Título: | Intact calcium signaling in adrenergic-deficient embryonic mouse hearts. |
[So] Source: | Biochem Biophys Res Commun;495(4):2547-2552, 2018 01 22. |
[Is] ISSN: | 1090-2104 |
[Cp] País de publicação: | United States |
[La] Idioma: | eng |
[Ab] Resumo: | Mouse embryos that lack the ability to produce the adrenergic hormones, norepinephrine (NE) and epinephrine (EPI), due to disruption of the dopamine beta-hydroxylase (Dbh ) gene inevitably perish from heart failure during mid-gestation. Since adrenergic stimulation is well-known to enhance calcium signaling in developing as well as adult myocardium, and impairments in calcium signaling are typically associated with heart failure, we hypothesized that adrenergic-deficient embryonic hearts would display deficiencies in cardiac calcium signaling relative to adrenergic-competent controls at a developmental stage immediately preceding the onset of heart failure, which first appears beginning or shortly after mouse embryonic day 10.5 (E10.5). To test this hypothesis, we used ratiometric fluorescent calcium imaging techniques to measure cytosolic calcium transients, [Ca ] in isolated E10.5 mouse hearts. Our results show that spontaneous [Ca ] oscillations were intact and robustly responded to a variety of stimuli including extracellular calcium (5 mM), caffeine (5 mM), and NE (100 nM) in a manner that was indistinguishable from controls. Further, we show similar patterns of distribution (via immunofluorescent histochemical staining) and activity (via patch-clamp recording techniques) for the major voltage-gated plasma membrane calcium channel responsible for the L-type calcium current, I , in adrenergic-deficient and control embryonic cardiac cells. These results demonstrate that despite the absence of vital adrenergic hormones that consistently leads to embryonic lethality in vivo, intracellular and extracellular calcium signaling remain essentially intact and functional in embryonic mouse hearts through E10.5. These findings suggest that adrenergic stimulation is not required for the development of intracellular calcium oscillations or extracellular calcium signaling through I and that aberrant calcium signaling does not likely contribute to the onset of heart failure in this model. |
[Mh] Termos MeSH primário: |
Adrenérgicos/metabolismo Sinalização do Cálcio/fisiologia Cálcio/metabolismo Epinefrina/metabolismo Coração/embriologia Miocárdio/metabolismo Norepinefrina/metabolismo
|
[Mh] Termos MeSH secundário: |
Animais Camundongos Camundongos Knockout
|
[Pt] Tipo de publicação: | JOURNAL ARTICLE; RESEARCH SUPPORT, N.I.H., EXTRAMURAL; RESEARCH SUPPORT, NON-U.S. GOV'T |
[Nm] Nome de substância:
| 0 (Adrenergic Agents); SY7Q814VUP (Calcium); X4W3ENH1CV (Norepinephrine); YKH834O4BH (Epinephrine) |
[Em] Mês de entrada: | 1802 |
[Cu] Atualização por classe: | 180222 |
[Lr] Data última revisão:
| 180222 |
[Sb] Subgrupo de revista: | IM |
[Da] Data de entrada para processamento: | 171231 |
[St] Status: | MEDLINE |
|
|