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Change in Ca$^{2+}$-responses of cultivated brown adipocytes at adrenergic activation

Content Provider	Springer Nature Link
Author	Turovskii, E. A. Konakov, M. V. Berezhv, A. V. Zinchenko, V. P. Bronnikov, G. E. Dolgacheva, L. P.
Copyright Year	2011
Abstract	The thermogenic capability of brown adipose tissue is controlled by noradrenaline. By interacting with α1- and β-adrenoreceptors of adipocytes, noradrenaline (NA) increases the intracellular concentration of Ca$^{2+}$ ([Ca$^{2+}$]$_{i}$) and cAMP. The changes in [Ca$^{2+}$]$_{i}$ under the action of NA and selective agonists of α1- and β-adrenoreceptors, i.e., cirazoline and isoproterenol (IP), are recorded on individual cells of the primary culture of adipocytes during the day in vitro (DIV) 1, DIV 3, and DIV 6. The change in [Ca$^{2+}$]$_{i}$ under the effect of IP as compared to the response to cirazoline in cells of DIV 1 is characterized by a higher amplitude and shorter duration of impulses in the entire diapason of the used physiological concentrations. After DIV 3, these differences are insignificant and, after DIV 6, the differences in kinetics are nearly absent. For all three agonists, the kinetics of the [Ca$^{2+}$]$_{i}$ change in the proliferating and differentiated cells is significantly different; i.e., the response amplitude increases with the age of the culture and the duration of transitory response decreases, while sensitivity to agonists of adrenoreceptors increases. It can be seen from the rise in [Ca$^{2+}$]$_{i}$ with an inhibitor of Ca$^{2+}$-ATPase of the endoplasmic reticulum thapsigargin in calcium-free medium that the source of calcium ions in the endoplasmic reticulum rises with the growth and development of cells in culture, while the rate at which Ca$^{2+}$ is pumped out of cells, which characterizes the activity of Ca$^{2+}$-ATPase of the plasma membrane, increases.
Starting Page	511
Ending Page	519
Page Count	9
File Format	PDF
ISSN	1990519X
Journal	Cell and Tissue Biology
Volume Number	5
Issue Number	5
e-ISSN	19905203
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-10-16
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	brown preadipocyte adrenergic receptor intracellular Ca$^{2+}$ culture Cell Biology
Content Type	Text
Resource Type	Article
Subject	Cell Biology

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Ca$^{2+}$ responses induced by adrenergic agonists in preadipocytes of mouse and ground squirrel (Spermophillus undulates)

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