The CRF hypothesis and stress

CRF is synthesized in the hypothalamus and elicits the release of adrenocorticotropic hormone (ACTH) from the pituitary. CRF was isolated from sheep hypothalamus and its structure as a 41-amino-acid peptide determined.96 The hypothalamic paraventricular nucleus (PVN) is the major region in the brain of CRF-containing cell bodies and through axonal projections to the capillaries of the median eminence can secrete CRF directly into the portal system where it acts at the pituitary to regulate ACTH secretion into the circulation. The principal role of ACTH is to stimulate the release of cortisol from the adrenal gland, thus completing the HPA axis, a primary component of the neuroendocrine response to stress. Similarly, projections from the PVN to the lower brainstem and spinal cord have been demonstrated to regulate autonomic function and help to further mediate the behavioral responses to stress. High densities of CRF-containing neurons are localized in particular to prefrontal, cingulate, and insular areas and appear to regulate behavioral actions of the peptide. Above and beyond its direct role in mediating HPA activity, the extrahypothalamic anatomical distribution of CRF suggests that this neuroactive peptide is localized in discrete brain regions that are thought to regulate mood and stress-related behaviors.89 Administration of CRF into the locus coeruleus initiates stress responses accompanied by increases in catecholamine turnover and activity in the frontal cortex suggesting that the peptide produces anxiety-related behavior by increasing the activity of the noradrenergic system.89 Such studies implicate CRF and related peptides in the mechanisms through which various stressors can alter behavior.89

Do Not Panic

Do Not Panic

This guide Don't Panic has tips and additional information on what you should do when you are experiencing an anxiety or panic attack. With so much going on in the world today with taking care of your family, working full time, dealing with office politics and other things, you could experience a serious meltdown. All of these things could at one point cause you to stress out and snap.

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