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Methylene Blue Facilitates The Extinction Of Fear In An Animal Model Of Susceptibility To Learned He

Discussion in 'Scientific Studies' started by paymanz, Nov 6, 2015.

  1. paymanz

    paymanz Member

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    Methylene blue facilitates the extinction of fear in an animal model of susceptibility to learned helplessness. - PubMed - NCBI


    Abstract

    The objectives were to (1) extend previous findings on fear extinction deficits in male congenitally helpless rats (a model for susceptibility to learned helplessness) to female congenitally helpless rats, and (2) attempt a therapeutic intervention with methylene blue, a metabolic enhancer that improves memory retention, to alleviate the predicted extinction deficits. In the first experiment, fear acquisition (four tone-shock pairings in operant chamber) was followed by extinction training (60 tones in open field). Congenitally helpless rats showed fear acquisition similar to controls but had dramatic extinction deficits, and did not display the gradual extinction curves observed in controls. Congenitally helpless rats demonstrated greater tone-evoked freezing as compared to controls in both the acquisition and extinction contexts one week after extinction training, and also in the extinction probe conducted one month later. In the second experiment (which began one month after the first experiment) congenitally helpless subjects were further exposed to tones for 5 days, each followed by 4 mg/kg methylene blue or saline IP, and had a fear renewal test in the acquisition context. Methylene blue administration improved retention of the extinction memory as demonstrated by significant decreases in fear renewal as compared to saline-administered congenitally helpless subjects. The impaired ability to extinguish fear to a traumatic memory in congenitally helpless rats supports the validity of this strain as an animal model for vulnerability to post-traumatic stress disorder, and this study further suggests that methylene blue may facilitate fear extinction as an adjunct to exposure therapy.
     
  2. DaveFoster

    DaveFoster Member

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    This may be partly due to it's MAO-A inhibition. Nevertheless, anything that preserves serotonin is undesirable in my book.
     
  3. OP
    paymanz

    paymanz Member

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    t3 also has same effect on learned helplessness.
     
  4. DaveFoster

    DaveFoster Member

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    Interesting. I've often heard that T3 is dopaminergic, so I'll do some more digging into this. I'm curious as to whether or not the addition of Idebenone and other quinones would have a similar effect (due to increased ATP production.)
     
  5. CoolTweetPete

    CoolTweetPete Member

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    Incredible stuff. Methlyene blue is such a fascinating substance. Thanks for this.
     
  6. OP
    paymanz

    paymanz Member

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  7. johnwester130

    johnwester130 Member

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    I no longer take methylene blue and I feel better.

    I think I took it for about 5 months

    It has other uses though that can be beneficial
     
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