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Neuron Transplants Help Obese Rats To Lose Weight

7c76dhu5 Completing the Circuit to Curb ObesityObesity is the most significant chronic healthcare crisis facing the United States, as well as other countries. Already 1 out of every 3 adults, and 1 out of every 6 children or adolescents, in the U.S. is obese! Leptin is a hormone that has received considerable attention since its discovery in 1994 for its role in regulating metabolism (like a thermostat, or adipostat) and implications for obesity. High leptin levels are associated with feeling satiated and an active metabolism. Though many overweight people have high levels of circulating leptin, it’s been found that their hypothalamic neurons do not receive the signal – a phenomenon known as “leptin resistance.” An animal model that mirrors this is db/db mice, which lack leptin receptors on the surface of they hypothalamic neurons and are therefore morbidly obese (see image).

Reporting in Science this past week, researchers at Harvard Medical School transplanted neurons with the leptin receptor into the hypothalami of db/db mice and as a result were able to partially restore leptin sensitivity and ameliorate their obesity. Two to three months after transplanting 15,000 (a relatively small number) fluorescently-tagged, leptin sensitive neurons into the db/db mice hypothalami, they observed statistically significant drops in blood sugar levels, leptin concentration, and fat mass. In terms of the mechanism and implications, the team concludes: Read more »

Latest Interviews

IDEA Labs: Medical Students Take The Lead In Healthcare Innovation

It’s no secret that doctors are disappointed with the way that the U.S. healthcare system is evolving. Most feel helpless about improving their work conditions or solving technical problems in patient care. Fortunately one young medical student was undeterred by the mountain of disappointment carried by his senior clinician mentors…

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How To Be A Successful Patient: Young Doctors Offer Some Advice

I am proud to be a part of the American Resident Project an initiative that promotes the writing of medical students residents and new physicians as they explore ideas for transforming American health care delivery. I recently had the opportunity to interview three of the writing fellows about how to…

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Latest Book Reviews

Book Review: Is Empathy Learned By Faking It Till It’s Real?

I m often asked to do book reviews on my blog and I rarely agree to them. This is because it takes me a long time to read a book and then if I don t enjoy it I figure the author would rather me remain silent than publish my…

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The Spirit Of The Place: Samuel Shem’s New Book May Depress You

When I was in medical school I read Samuel Shem s House Of God as a right of passage. At the time I found it to be a cynical yet eerily accurate portrayal of the underbelly of academic medicine. I gained comfort from its gallows humor and it made me…

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Eat To Save Your Life: Another Half-True Diet Book

I am hesitant to review diet books because they are so often a tangled mess of fact and fiction. Teasing out their truth from falsehood is about as exhausting as delousing a long-haired elementary school student. However after being approached by the authors’ PR agency with the promise of a…

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