2016年3月16日訊 /生物谷BIOON/ --棕色脂肪組織是負責哺乳動物非戰慄性產熱的一個主要部位,許多科學家將其視作預防和治療肥胖的靶點。最近一項研究發現鈣離子通道TRPV2在小鼠的棕色脂肪產熱過程中發揮重要調節作用,缺少TRPV2會損傷小鼠棕色脂肪組織的非戰慄性產熱過程。TRPV2雖然在調節許多細胞功能方面發揮著重要作用,但該研究首次發現了其在棕色脂肪細胞產熱功能方面的作用。相關研究結果發表在國際學術期刊EMBO reports上。
在該研究中研究人員發現TRPV2能夠在棕色脂肪細胞內表達,他們構建了TRPV2敲除小鼠並利用TRPV2敲除小鼠分離棕色脂肪前體細胞進行體外培養和誘導分化,結果發現許多產熱基因的mRNA水平發生下調,而在敲除小鼠的棕色脂肪組織內也存在類似現象。
研究人員表示,產熱基因能夠受到beta腎上腺素受體刺激的誘導,該受體是交感神經激活的下遊分子通常能夠引起產熱過程,而在TRPV2敲除小鼠的棕色脂肪細胞中該過程也受到抑制。除此之外,TRPV2敲除小鼠的白色脂肪組織增多,棕色脂肪細胞變大,在冷凍刺激的情況下,敲除小鼠的體溫不能恆定維持在正常的37度左右。更進一步的,在高脂飲食誘導下TRPV2敲除小鼠的體重和脂肪含量也增加得更加明顯,研究人員認為這可能是由於TRPV2敲除小鼠的產熱能力下降所導致。
基於上述發現,研究人員總結道TRPV2在棕色脂肪組織的產熱過程中發揮重要作用,如果在人類身上也存在類似現象,該分子或可成為預防和治療肥胖的潛在靶點。(生物谷Bioon.com)
本文系生物谷原創編譯整理,歡迎轉載!點擊 獲取授權 。更多資訊請下載生物谷APP.
DOI 10.15252/embr.201540819
Lack of TRPV2 impairs thermogenesis in mouse brown adipose tissue
Wuping Sun, Kunitoshi Uchida, Yoshiro Suzuki, Yiming Zhou, Minji Kim, Yasunori Takayama, Nobuyuki Takahashi, Tsuyoshi Goto, Shigeo Wakabayashi, Teruo Kawada, Yuko Iwata, Makoto Tominaga
Brown adipose tissue (BAT), a major site for mammalian non‐shivering thermogenesis, could be a target for prevention and treatment of human obesity. Transient receptor potential vanilloid 2 (TRPV2), a Ca2+‐permeable non‐selective cation channel, plays vital roles in the regulation of various cellular functions. Here, we show that TRPV2 is expressed in brown adipocytes and that mRNA levels of thermogenic genes are reduced in both cultured brown adipocytes and BAT from TRPV2 knockout (TRPV2KO) mice. The induction of thermogenic genes in response to β‐adrenergic receptor stimulation is also decreased in TRPV2KO brown adipocytes and suppressed by reduced intracellular Ca2+ concentrations in wild‐type brown adipocytes. In addition, TRPV2KO mice have more white adipose tissue and larger brown adipocytes and show cold intolerance, and lower BAT temperature increases in response to β‐adrenergic receptor stimulation. Furthermore, TRPV2KO mice have increased body weight and fat upon high‐fat‐diet treatment. Based on these findings, we conclude that TRPV2 has a role in BAT thermogenesis and could be a target for human obesity therapy.