Feast to famine: Oxygen starvation regulates fat cells in obesity

Sep 25, 2013
Feast to famine: Oxygen starvation regulates fat cells in obesity
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.

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 . 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 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.

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More information: Nakamura, Y. et al. Repression of adipogenesis through promotion of Wnt/?-catenin signaling by TIS7 up-regulated in adipocytes under hypoxia, Biochimica et Biophysica Acta 1832 (2013) 1117–1128.

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