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Feast to famine: Oxygen starvation regulates fat cells in obesity

Date:
September 25, 2013
Source:
Organization of Frontier Science and Innovation, Kanazawa University
Summary:
Researchers have identified the role of the protein TIS7 in processes that regulate adipogenesis, whereby non-specialised cells become adipose or fat cells.

3T3-L1 cells cultured under normoxia and hypoxia, followed by fractionation of both nucleus and cytoplasm: TIS7, Lamin B1 and β-tubulin expression determined by immunoblotting.
Credit: Image courtesy of Organization of Frontier Science and Innovation, Kanazawa University

Researchers at Kanazawa University have identified the role of the protein TIS7 in processes that regulate adipogenesis, whereby non-specialised cells become adipose or fat cells.

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Studies of the effects of oxygen deprivation in the body fat of obese animals have revealed links with the regulation of fat cell generation. Researchers at Kanazawa University have identified the role of the protein TIS7 in processes that regulate adipogenesis, whereby non-specialised cells become adipose or fat cells. They add, "TIS7 could be a target for the discovery and development of a drug useful for the treatment and therapy of obesity or a variety of obesity-related metabolic diseases including type-2 diabetes and atherosclerosis."

Adipose tissue is essential for whole body homeostasis, storing excess energy and potentially a number of other physiological processes. Deregulation of these functions is found in obesity, prompting further study of the mechanisms behind white adipose tissue development.

Adipose tissue is poorly oxygenated in obese humans and animals. Poor oxygenation or 'hypoxia' has been linked to a number of diseases including heart and lung disorders, anemia, and circulation problems. There have also been reports indicating that the protein TIS7 is expressed in tissues following injuries, such as ischemia, stroke or muscle trauma. Yukio Yoneda and colleagues at the University of Kanazawa monitored TIS7 expression in vitro and found that it was drastically increased by hypoxic stress.

The researchers then compared mice fed different diets and found significant up-regulation of TIS7 in the white adipose tissue of mice fed a high fat diet. Following further studies of various aspects of adipogenesis and the role of hypoxia and TIS7, the researchers conclude, "It thus appears that TIS7 is a novel pivotal transcriptional regulator of hypoxia-induced repression of adipogenesis." They add that further studies are needed to understand the exact mechanism underlying the up-regulation of TIS7 under hypoxia in cells prior to adipogenesis.


Story Source:

The above story is based on materials provided by Organization of Frontier Science and Innovation, Kanazawa University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Yukari Nakamura, Eiichi Hinoi, Takashi Iezaki, Saya Takada, Syota Hashizume, Yoshifumi Takahata, Emiko Tsuruta, Satoshi Takahashi, Yukio Yoneda. Repression of adipogenesis through promotion of Wnt/β-catenin signaling by TIS7 up-regulated in adipocytes under hypoxia. Biochimica et Biophysica Acta (BBA) - Molecular Basis of Disease, 2013; 1832 (8): 1117 DOI: 10.1016/j.bbadis.2013.03.010

Cite This Page:

Organization of Frontier Science and Innovation, Kanazawa University. "Feast to famine: Oxygen starvation regulates fat cells in obesity." ScienceDaily. ScienceDaily, 25 September 2013. <www.sciencedaily.com/releases/2013/09/130925112233.htm>.
Organization of Frontier Science and Innovation, Kanazawa University. (2013, September 25). Feast to famine: Oxygen starvation regulates fat cells in obesity. ScienceDaily. Retrieved December 18, 2014 from www.sciencedaily.com/releases/2013/09/130925112233.htm
Organization of Frontier Science and Innovation, Kanazawa University. "Feast to famine: Oxygen starvation regulates fat cells in obesity." ScienceDaily. www.sciencedaily.com/releases/2013/09/130925112233.htm (accessed December 18, 2014).

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