Dysregulation of the HPA Axis
We all know people, maybe even ourselves, who were raised or lived in a toxic
psychological environment. Researchers have recently discovered that the HPA (Hypothalamus, Pituitary,
Adrenal) Axis can become "dysregulated" in these kind of environments
and, yes, it's very ugly. The hypothalamus, pituitary and adrenal glads
are
all-important hormone-effecting and producing glands that you want operating
optimally.
This is yet another reason
to Protect Yourself from Stress, because it is
usually stressors that lead to this sort of HPA dysregulation. For example, we
all know that depression is not always a "simple fix". One reason is that
its roots can be so deep: childhood sexual abuse, for example, is a strong
predictor of adult-onset depression particularly for women, but also for men as
well. The reason? Researchers have found that it results from "stress-induced
dysregulation of the HPA axis". [1] Researchers have found that
children who have been maltreated during childhood have a similar pattern:
dysregulation of the HP&A and significantly higher rates of psychiatric
disorders. [5]
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So what does this dysregulation mean? Scientists are just beginning to
discover the answers to these questions. One thing it means is, generally,
higher baseline cortisol levels throughout the day. Of course, higher
cortisol levels attack neurons, add deadly visceral fat and depresses
testosterone levels for starters. One study of children who lost a parent during
9-11 found all these cortisol-based symptoms and that these children had twice
the rate of psychiatric disorders as prior to 9-11. One other phenomenon
that they observed: some children with psychiatric disorders often had
suppressed cortisol levels.
[2][3] Researchers believe this is because their cortisol was so high for
a period of time post-trauma that their receptors become insensitive.
Of course, in life we do not always have control over these sort of events.
However, whenever possible, it is critical that you protect yourself, because
psychiatric researchers have discovered that numerous cortisol and psychiatric
disorders are associated with the same HPA dysregulation issues. We already
mentioned depression above. Depersonalization disorder has been found to
have suppressed cortisol levels and HPA dysregulation. [4] Schizophrenia
patients have been found to have many cortisol-related abnormalities and, in
particular, to be less responsive to stress, a sign of the "cortisol
insensitivity" mentioned above. [6] And researchers have found that there
is good evidence that HPA dysregulation can lead to antisocial and psychopathic
disorders. [7][8]
I'm not saying that just because you've been "through hell" that you're going to
go AWOL. However, on the other side, it is important to realize that you
(or your loved ones) will not go through such events unscathed. The bottom
line is to do all you can to protect yourself: the research is showing the
physiological reasons for the permanent "scarring" and damage that occurs.
REFERENCES:
1)
Am J Psychiatry, June 1999, 156:816-828, "Childhood Sexual Abuse as a
Risk Factor for Depression in Women: Psychosocial and Neurobiological
Correlates"
2)
http://www.medscape.com/viewarticle/554738, Apr 5 2007, Medscape Medical
News, "Children Who Lost a Parent in the 9/11 Terror Attack Had Persistent HPA
Axis Dysregulation"
3) Biol Psychiatry, 2007, 61:957-965
4) Neuropsychopharmacology, 2001, 25:793-795, "Hypothalamic-pituitary-adrenal
Axis Dysregulation in Depersonalization Disorder"
5) Psychoneuroendocrinology, 2005 Feb, 30(2):162-78, "Child maltreatment and HPA
axis dysregulation: relationship to major depressive disorder and post traumatic
stress disorder in females"
6) The British Journal of Psychiatry, 2004, 184:S72-S75, "Stress and the genesis
of diabetes mellitus in schizophrenia"
7) Psychol Bull, 2007 Jan, 133(1):149-82, "The evidence for a neurobiological
model of childhood antisocial behavior"
8) Neuropsychiatr Dis Treat. 2010; 6: 691–697, "Neuroendocrine aspects of
pediatric aggression: Can hormone measures be clinically useful?"