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Science

Hair Growth Signal Dictated By Fat Cells 146

RogerRoast writes "According to an article published in the journal Cell, molecular signals from fat cell (adipocyte) precursors under the skin are necessary to spur hair growth in mice. Yale researchers report in the paper that these cells produce molecules called PDGF (platelet derived growth factors), which are necessary to produce hair growth. The discovery of the source of signals that trigger hair growth may lead to new treatments for baldness. The trick is in getting adipocyte precursors under the skin to talk to stem cells at the base of the hair follicles."
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Hair Growth Signal Dictated By Fat Cells

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  • by Anonymous Coward on Tuesday September 06, 2011 @05:12AM (#37313854)

    ...That the average American now has another excuse for his obesity?

  • by PolygamousRanchKid ( 1290638 ) on Tuesday September 06, 2011 @05:24AM (#37313898)

    The trick is in getting adipocyte precursors under the skin to talk to stem cells at the base of the hair follicles.

    So why not skip all the steps in between, and just sew together toupees of peeled mice?

    . . . um . . . warning sticker . . . "Stay away from cats, when in use."

  • IN MICE (Score:5, Informative)

    by snowgirl ( 978879 ) on Tuesday September 06, 2011 @05:28AM (#37313906) Journal

    This finding has been made IN MICE. Now, I'm not usually one to suggest that just because an effect is demonstrated in a lab animal that it won't apply to humans, but hey, saccharine only caused bladder cancer in lab rats because they have a different urinary tract, and they were retaining it in a way that would never happen in humans.

    Now, the disclaimer being made, women have a larger dispersion of fat about the whole body, and while they have more vellus hair then men, vellus hair is hardly noticeable, and in fact, "balding" is typically a result of the hair on one's head turning into vellus hair. So, making humans grow more vellus hair isn't really going to solve anything.

    • by dintech ( 998802 ) on Tuesday September 06, 2011 @06:23AM (#37314072)

      I know, from the summary title I was hoping for a link between being fat and being bald, since often we men exhibit both characteristics. Disappointments all round. I can take down that banner welcoming our fat, bald, vellus enveloped overlords.

      • by snowgirl ( 978879 ) on Tuesday September 06, 2011 @07:08AM (#37314230) Journal

        I know, from the summary title I was hoping for a link between being fat and being bald, since often we men exhibit both characteristics. Disappointments all round. I can take down that banner welcoming our fat, bald, vellus enveloped overlords.

        Well, there's no reason to doubt that fatty tissue could lead to more vellus hair. In fact, since women typically have more of both, it might actually be related in humans. I suppose, the point I was trying to make was that when we think of "hair", we think there is only one kind... silly us, there's actually three kinds. (vellus hair, and two types of terminal hair: on the head, and "axillary hair", which is vellus hair that turns to terminal hair under exposure to testosterone.)

        So, it's entirely possible that we could cause humans to grow more hair with this process, we just wouldn't usually call it hair, because we don't typically consider vellus hair to be "hair".

        So, don't let your desire to wave your banner wane, there is still a chance that that much might actually apply to humans.

        • by ArsenneLupin ( 766289 ) on Tuesday September 06, 2011 @07:29AM (#37314296)

          . silly us, there's actually three kinds. (vellus hair, and two types of terminal hair: on the head, and "axillary hair", which is vellus hair that turns to terminal hair under exposure to testosterone.)

          Interesting... so which type is the hair that women have under their armpits and around their pussy? Obviously not vellus (it's to thick for that), not head hair (it's preferred by pubic lice rather than by head lice), and not "axillary hair" (where would the needed testosterone come from?)

          • by FalcDot ( 1224920 ) on Tuesday September 06, 2011 @08:27AM (#37314582)

            Women have testosterone, just not as much as men.

          • by snowgirl ( 978879 ) on Tuesday September 06, 2011 @10:23AM (#37315736) Journal

            . silly us, there's actually three kinds. (vellus hair, and two types of terminal hair: on the head, and "axillary hair", which is vellus hair that turns to terminal hair under exposure to testosterone.)

            Interesting... so which type is the hair that women have under their armpits and around their pussy? Obviously not vellus (it's to thick for that), not head hair (it's preferred by pubic lice rather than by head lice), and not "axillary hair" (where would the needed testosterone come from?)

            As someone else already noted, it is axillary hair. Women have some testosterone in their systems, but not enough to usually activate axillary hair beyond the pubic area, and armpits. However, since each "axillary hair patch" has a different level of response to testosterone, pubic hair being highly sensitive, and chest hair being quite low sensitivity, women tend to get pubic hair, but not chest hair.

            Women with CAIS (Complete Androgen Insensitivity Syndrome... and no, there are no men with CAIS) actually have limited if even any pubic hair, because their whole body lacks sensitivity to androgens regardless of the location on their body. It's one of the first traits that one should use to suspect CAIS: "does she have surprisingly low amounts of body hair regardless of being well into puberty?"

            Oddly, in some cases, women may have medical conditions that require a treatment with testosterone. They usually can expect increased terminal hair as a side-effect of the treatment. Namely, the mustache is usually the next axillary hair growth area and may even activate into terminal hair growth even under only natural testosterone levels.

            The idea that many of our biological traits are as drastically different as our genitalia has little evidence to support it, and is actually counter to almost the entire evidence available. Functionally, men and women are nearly identical, and use testosterone and estrogen equally, and both tend to respond each to the other just as much as a person of the other gender at the same age. But when we hear, "men use androgens, and women use estrogens", we are naturally drawn by our common sense to assume that this means that those traits are exclusive traits, but they are not. Beyond the state of the gonads (testicle vs ovary), almost nothing is exclusive to only one sex.

      • by ArsenneLupin ( 766289 ) on Tuesday September 06, 2011 @07:25AM (#37314282)

        I was hoping for a link between being fat and being bald

        There is a link. Hint: very few men wear their fat on the top of their head...

    • by AbRASiON ( 589899 ) * on Tuesday September 06, 2011 @06:23AM (#37314078) Journal

      You just ruined the days of hundreds of slashdot readers, thanks for the FACTS pal!
      Someone mod this guy +5 dream shattering.

    • by roman_mir ( 125474 ) on Tuesday September 06, 2011 @06:24AM (#37314084) Homepage Journal

      Yeah, but the upside is huge. Imagine all those mice with all those neat hair styles? It would be a blast.

    • by FreakyGreenLeaky ( 1536953 ) on Tuesday September 06, 2011 @07:55AM (#37314408)

      You're not bald right? So shut the fuck up and allow the rest of us to dream.

      I can just imagine you sitting there with your ridiculously thick mop of lush hair and pompously stomping on our hopes.

    • i wouldn't, for example, use mice as a valid model for say, genes having to do with brain structure in human beings. homo sapiens have made some changes in that department as compared to our mammalian cousins or even our simian cousins

      but, evolutionarily speaking, we are so close to mice that a cell signalling pathway as basic as this one is most likely shared between mice and men

      even if the signalling system were dormant in humans, we most likely still have the genes for it, and it could be revived in human beings under certain conditions

      it's valid to talk about something like this in mice applying to humans. it would be exceptional if we did not share the same pathway

      • by snowgirl ( 978879 ) on Tuesday September 06, 2011 @10:09AM (#37315590) Journal

        You're of course right, and my first paragraph was intended to be a disclaim of "I'm not saying that nothing in lab animals is applicable to humans", but rather, I wanted to point out that "hair" isn't just one thing in humans. There are two types of hair, vellus hair, and terminal hair, and it's entirely possible that this process would only activate vellus hair growth (being that women have more fat on average, and more vellus hair, this seems like a possibility).

        My objection was that while this could be used to grow more hair, there is no guarantee that it could be used to grow more of the same type of hair that most people mean when they say, "hair". Because, in fact, bald men don't have any less hair, they just have had terminal hair follicles change to vellus hair follicles. (Excepting the case where a man is bald because he shaved, or used a form of epilation.)

    • by sonicmerlin ( 1505111 ) on Tuesday September 06, 2011 @05:10PM (#37320628)
      On that note, cancer has been cured a thousand times in mice. Still no cure for human cancer though. If scientists were allowed to act like Nazis and experiment on humans without regard to ethical concerns, we'd of course have cures for nearly every disease imaginable. Then again it's nice not to be Nazis. But in this one case, maybe they could speed-track human trials and experiments for baldness...? Pretty please...?
    • by cavebison ( 1107959 ) on Tuesday September 06, 2011 @11:55PM (#37323108)

      Now, I'm not usually one to suggest that just because an effect is demonstrated in a lab animal that it won't apply to humans

      Haven't you read Of Mice and Men?

  • by SplicerNYC ( 1782242 ) on Tuesday September 06, 2011 @05:53AM (#37313970)
    Off of vain people although I find that being bald is not only cheaper but neater. Now if they can only find a way to get reverse the hair growth on my back.
  • by Culture20 ( 968837 ) on Tuesday September 06, 2011 @06:04AM (#37314010)
    I could have told you that.
  • by hedgemage ( 934558 ) on Tuesday September 06, 2011 @06:26AM (#37314088)
    I am a fat man that is apparently repugnant to women. Despite this, many different women have commented on the quality of my shoulder-length hair.
    Am I blessed with great hair because I am a fat little man?
    I imagine that on Slashdot I can't be the only fat man with great hair who can't get a date...
    • by ArsenneLupin ( 766289 ) on Tuesday September 06, 2011 @07:33AM (#37314320)

      I am a fat man that is apparently repugnant to women.

      :-)

      Despite this, many different women have commented on the quality of my shoulder-length hair.

      And how is your chest (and back...) hair?

      I imagine that on Slashdot I can't be the only fat man with great hair who can't get a date...

      Maybe you are too restrictive in your choice of partners?

    • by Lumpy ( 12016 ) on Tuesday September 06, 2011 @08:01AM (#37314424) Homepage

      You cant get a date because you are too "picky" of what you call acceptable. I know a lot of fat geeks that will "only date a hottie".. Yet they also refuse to get any social skills or even bathe weekly let alone the normal bathing cycle. oh and washed clothes, teeth brushing, etc.....

      Guess what, you are not gonna get a hottie. So either start looking at realistic pool of women to target or give up. Honestly, 99% of the time it's not just "looks" that is the repulsion. it's personality, interaction and hygene that have 75% of the repulsion factor. And a lot of guys are simply completely idiotic in their expectations.

  • by master_p ( 608214 ) on Tuesday September 06, 2011 @06:33AM (#37314112)

    It's not the rule, of course. There are fat men who are bold. But, from what I see, the majority of bald men have little fat on their bodies; they are usually slim.

  • by dimeglio ( 456244 ) on Tuesday September 06, 2011 @06:55AM (#37314186)

    I always hear "may not work on humans." Sounds to me like scientists pretty much cured rodents of all possible disease. Even cancer, now baldness, is no longer a problem for mice.

  • by Capt James McCarthy ( 860294 ) on Tuesday September 06, 2011 @08:07AM (#37314442) Journal

    There is no long term money to be made in curing baldness. The target has always been long term treatment.

    • by foniksonik ( 573572 ) on Tuesday September 06, 2011 @08:46AM (#37314742) Homepage Journal

      But that's true of every disease or genetic annoyance. Why invent a cure when you can invent a treatment? The only cures include heinously expensive surgery and artificial device implantation with potential lifelong anti-rejection treatments.

      OTOH if there were cures available countries like Sweden with full healthcare coverage would have them, so it's unlikely that they exist but are being suppressed.

  • by cyberchondriac ( 456626 ) on Tuesday September 06, 2011 @10:59AM (#37316064) Journal
    for me.
    I gave up last year, and just shaved my whole head. Done. I hate that look like you're wearing a public toilet seat on your head, AKA the horseshoe. Now, I'd prefer a full head of hair (I love hair) but since I was losing it on top, I decided to get rid of it all - all or nothing. I wish I could've done that 20 years ago, but back then, a fully shaved head was still considered a bit freakish, ala "Mr. Clean". Nowadays it's pretty normal, and that practice is probably here to stay.
    I've wondered if alopecia isn't a continuation of human evolution; we've shed most of our body hair, but why would we keep so much on our heads? Maybe it's the last bit to go?
  • by BitwizeGHC ( 145393 ) on Tuesday September 06, 2011 @11:33AM (#37316492) Homepage

    "Some had high hopes the genetic engineering would correct this trend in evolution, but sadly the greatest minds and resources where focused on conquering hair loss and prolonging erections."

  • by rinoid ( 451982 ) on Tuesday September 06, 2011 @12:38PM (#37317120)

    I'm a bald.

    And I don't give a flying shit about hair restoration.

  • by Nyder ( 754090 ) on Tuesday September 06, 2011 @06:09PM (#37321136) Journal

    So I have long thick beautiful hair because I'm a fat head?

    Okay, cool. I still lose more hair in 1 washing then most of you guys have on your head.

    So you can call me fat head, or fatty head, and i'll just keep calling you 8-ball, dick head, and of course, baldy.

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