Psych · Foundations — psychoneuroendocrinology and psychoimmunology
Psychoneuroendocrinology and psychoimmunology
Also known as Psychoneuroimmunology · HPA axis psychiatry · Stress biology psychiatry · Cytokine hypothesis of depression · Sickness behaviour · Allostatic load mental health · Glucocorticoid receptor depression
Exam-exhaustive fellowship foundation on psychoneuroendocrinology and psychoimmunology: HPA/HPG/HPT axes, allostatic load, glucocorticoid receptor resistance, tuberoinfundibular prolactin pharmacology, cytokine–brain signalling, sickness behaviour, inflammatory depression and psychosis risk evidence, investigation limits, and clinical application without biomarker overclaim. FRANZCP-primary, globally tagged.
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Target exams
Red flags
- Adrenal crisis, thyroid storm, or severe steroid neurotoxicity — medical emergency pathways first; do not reframe as functional stress alone
- New psychosis with fever, seizures, dysautonomia, or rapid cognitive decline — consider autoimmune encephalitis and organic work-up
- Cushingoid habitus, progressive cognitive change, or unexplained hypokalaemia with treatment-resistant depression — screen for hypercortisolism with endocrinology
- Do not use dexamethasone suppression test, single cortisol, CRP, or IL-6 as diagnostic tests for MDD or primary psychosis
- Symptomatic antipsychotic hyperprolactinaemia (amenorrhoea, galactorrhoea, hypogonadism) — investigate and revise regimen; do not ignore until bone or fertility harm
- Neuroscience and biomarkers never replace structured suicide and violence risk assessment
Meet the patient — and the cortisol story she has read
A 38-year-old woman with treatment-resistant depression hands you a printout: her CRP is mildly raised and she has read that "depression is inflammation". She asks whether she should stop her antidepressant and take an anti-inflammatory instead.[5][6]
The biology she has half-grasped is real. The conclusion she has drawn is not. The fellowship task is to honour the mechanism — HPA drive, glucocorticoid receptor resistance, cytokine-to-brain signalling — without collapsing a person into a single number, and without ever letting a cortisol or a CRP triage her suicide risk.[2][6]
Etymology for viva gold: allostasis, from Greek allos, "other", plus stasis, "standing" — achieving stability through change, not by holding a fixed set-point. It is the word that upgrades "fight or flight" into a framework examiners respect.[1]
References16ShowHide
- [1]McEwen BS Protective and damaging effects of stress mediators N Engl J Med, 1998.PMID 9428819
- [2]Pariante CM, Lightman SL The HPA axis in major depression: classical theories and new developments Trends Neurosci, 2008.PMID 18675469
- [3]Holsboer F The corticosteroid receptor hypothesis of depression Neuropsychopharmacology, 2000.PMID 11027914
- [4]Dantzer R, O'Connor JC, Freund GG, Johnson RW, et al. From inflammation to sickness and depression: when the immune system subjugates the brain Nat Rev Neurosci, 2008.PMID 18073775
- [5]Raison CL, Capuron L, Miller AH Cytokines sing the blues: inflammation and the pathogenesis of depression Trends Immunol, 2006.PMID 16316783
- [6]Miller AH, Raison CL The role of inflammation in depression: from evolutionary imperative to modern treatment target Nat Rev Immunol, 2016.PMID 26711676
- [7]Capuron L, Miller AH Immune system to brain signaling: neuropsychopharmacological implications Pharmacol Ther, 2011.PMID 21334376
- [8]Khandaker GM, Pearson RM, Zammit S, Lewis G, et al. Association of serum interleukin 6 and C-reactive protein in childhood with depression and psychosis in young adult life: a population-based longitudinal study JAMA Psychiatry, 2014.PMID 25133871
- [9]Irwin MR, Cole SW Reciprocal regulation of the neural and innate immune systems Nat Rev Immunol, 2011.PMID 21818124
- [10]Felger JC, Lotrich FE Inflammatory cytokines in depression: neurobiological mechanisms and therapeutic implications Neuroscience, 2013.PMID 23644052
- [11]Gold PW, Chrousos GP Organization of the stress system and its dysregulation in melancholic and atypical depression: high vs low CRH/NE states Mol Psychiatry, 2002.PMID 11920153
- [12]Heim C, Nemeroff CB The role of childhood trauma in the neurobiology of mood and anxiety disorders: preclinical and clinical studies Biol Psychiatry, 2001.PMID 11430844
- [13]Sapolsky RM, Romero LM, Munck AU How do glucocorticoids influence stress responses? Integrating permissive, suppressive, stimulatory, and preparative actions Endocr Rev, 2000.PMID 10696570
- [14]Carroll BJ, Feinberg M, Greden JF, Tarika J, et al. A specific laboratory test for the diagnosis of melancholia. Standardization, validation, and clinical utility Arch Gen Psychiatry, 1981.PMID 7458567
- [15]Haddad PM, Wieck A Antipsychotic-induced hyperprolactinaemia: mechanisms, clinical features and management Drugs, 2004.PMID 15456328
- [16]Benros ME, Nielsen PR, Nordentoft M, Eaton WW, et al. Autoimmune diseases and severe infections as risk factors for schizophrenia: a 30-year population-based register study Am J Psychiatry, 2011.PMID 22193673