rice field, china
New study throws into question long-held belief about depression
New evidence puts into doubt the long-standing belief that a deficiency in serotonin — a chemical messenger in the brain — plays a central role in depression. In the journal ACS Chemical Neuroscience, scientists report that mice lacking the ability to make serotonin in their brains (and thus should have been “depressed” by conventional wisdom) did not show depression-like symptoms.
Donald Kuhn and colleagues at the John D. Dingell VA Medical Center and Wayne State University School of Medicine note that depression poses a major public health problem. More than 350 million people suffer from it, according to the World Health Organization, and it is the leading cause of disability across the globe. In the late 1980s, the now well-known antidepressant Prozac was introduced. The drug works mainly by increasing the amounts of one substance in the brain — serotonin. So scientists came to believe that boosting levels of the signaling molecule was the key to solving depression. Based on this idea, many other drugs to treat the condition entered the picture. But now researchers know that 60 to 70 percent of these patients continue to feel depressed, even while taking the drugs. Kuhn’s team set out to study what role, if any, serotonin played in the condition.
To do this, they developed “knockout” mice that lacked the ability to produce serotonin in their brains. The scientists ran a battery of behavioral tests. Interestingly, the mice were compulsive and extremely aggressive, but didn’t show signs of depression-like symptoms. Another surprising finding is that when put under stress, the knockout mice behaved in the same way most of the normal mice did. Also, a subset of the knockout mice responded therapeutically to antidepressant medications in a similar manner to the normal mice. These findings further suggest that serotonin is not a major player in the condition, and different factors must be involved. These results could dramatically alter how the search for new antidepressants moves forward in the future, the researchers conclude.
more works by this artist
Stevie Nicks was the first woman I ever heard say she had chosen not to have children because she cared more about her career. The first that ever warned me men might not like it if there are things more important to me than they are. The first that ever said that that was fine: sometimes, you have to leave them behind. Wherever she goes, she surrounds herself with girls. “I can’t imagine you in a bathing suit,” someone says in an interview for Rolling Stone, when Stevie says she likes to play in the pool in her backyard. “Yeah, well, you never will,” Stevie says. “There is never - ever - a man in the backyard. If there is, he is banished to the front of the house.” Men don’t get to look at Stevie Nicks unless Stevie Nicks wants men to look at Stevie Nicks. In her songs, even when she’s talking about how she has to change, she proclaims her power, her ability, her worth. She is a queen, she is a witch, she is a dragon, she is in control. She isn’t polite. She’s competitive. She’s bossy. She claimed all the things the men around her claimed — she spent as much money as they spent, had as much sex as they had, was as reckless as they were, stood at the front of the same stage — and never questioned that that was her right. The world tells us women are there for men, but despite all the boyfriends and the jokes about how she’s so easy and the sex-symbol status, she isn’t there for men at all. She does it without ever giving in to the men that dismiss her. She’s emotional. She’s dramatic. She raises her voice as much as she can. She thinks she’s pretty, she thinks she’s a star, and when her fans crowd up to the edge of the stage, crazy, she welcomes them, with open arms. She revels in it. She’s too much of a girl for you? She revels in it. —
(Source: oliviavonhexe, via devinanddevin)