Leptin engages a hypothalamic neurocircuitry to permit survival in the absence of insulin.

Leptin engages a hypothalamic neurocircuitry to permit survival in the absence of insulin.
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DOI:
10.1016/j.cmet.2013.08.004
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发表时间:
2013-09-03
期刊:
影响因子:
29
通讯作者:
Coppari R
Coppari R
中科院分区:
生物学1区
文献类型:
--
作者:
Fujikawa T;Berglund ED;Patel VR;Ramadori G;Vianna CR;Vong L;Thorel F;Chera S;Herrera PL;Lowell BB;Elmquist JK;Baldi P;Coppari R

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The dogma that life without insulin is incompatible has recently been challenged by results showing viability of insulin-deficient rodents undergoing leptin mono-therapy. Yet, the mechanisms underlying these actions of leptin are unknown. Here, the metabolic outcomes of intracerebroventricular (icv) administration of leptin in mice devoid of insulin and lacking or re-expressing leptin receptors (LEPRs) only in selected neuronal groups were assessed. Our results demonstrate that concomitant re-expression of LEPRs only in hypothalamic γ-aminobutyric acid (GABA)ergic and pro-opiomelanocortin (POMC) neurons is sufficient to fully mediate the life-saving and anti-diabetic actions of leptin in insulin deficiency. Our analyses indicate that enhanced glucose uptake by brown adipose tissue and soleus muscle, as well as improved hepatic metabolism, underlie these effects of leptin. Collectively, our data elucidate a hypothalamic-dependent pathway enabling life without insulin and hence pave the way for developing better treatments for diseases of insulin deficiency.
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