Cellular mechanisms underlying affective resiliency: The role of glucocorticoid receptor- and mitochondrially-mediated plasticity

• Published in: Brain research Vol. 1293; pp. 76 - 84
• Main Authors: Hunsberger, Joshua G, Austin, Daniel R, Chen, Guang, Manji, Husseini K
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01-10-2009; Elsevier
• Subjects: Adaptation, Physiological; Adult and adolescent clinical studies; Antimanic Agents - therapeutic use; Apoptosis; BAG-1; Bcl-2; Behavioral psychophysiology; Biological and medical sciences; Bipolar disorder; Bipolar Disorder - drug therapy; Bipolar Disorder - physiopathology; Bipolar disorders; FKBP5; Fundamental and applied biological sciences. Psychology; Glucocorticoid receptor; Hormones and behavior; Humans; Hypothalamo-Hypophyseal System - physiopathology; Medical sciences; Mood disorders; Neurology; Neuronal Plasticity; Pituitary-Adrenal System - physiopathology; Psychology. Psychoanalysis. Psychiatry; Psychology. Psychophysiology; Psychopathology. Psychiatry; Receptors, Glucocorticoid - physiology; Resiliency; Signal Transduction - physiology; Bcl-2; Bcl-2-associated athanogene; glucocorticoid receptor; prefrontal cortex; B-cell CLL/lymphoma 2; sgACC; heat shock protein; HPA axis; BAG-1; MDD; PFC; 51 kDa FK506-binding protein; hypothalamic–pituitary–adrenal axis; N-acetylaspartate; bipolar disorder; subgenual anterior cingulated cortex; SNPs; brain-derived neurotrophic factor; Resiliency; single nucleotide polymorphisms; extracellular signal regulated kinase; rCBF; Hsp; BDNF; GR; NAA; major depressive disorder; BPD; regional cerebral blood flow; ERK; FKBP5; Bipolar disorder; Glucocorticoid receptor; Mood disorder; Affect affectivity; Mitochondria; Plasticity; Review; Resilience
• ISSN: 0006-8993; 1872-6240
• DOI: 10.1016/j.brainres.2009.06.103

Abstract Bipolar disorder (BPD) is a devastating psychiatric illness marked by recurrent episodes of mania and depression. While the underlying pathophysiology of BPD remains elusive, an abnormal hypothalamic–pituitary–adrenal (HPA) axis and dysfunctional glucocorticoid receptor (GR) signaling are considered hallmarks. This review will examine how targeting resiliency signaling cascades at the cellular level may serve as a mechanism to treat BPD. Here, cellular resiliency is defined as the ability of a cell to adapt to an insult or stressor. Such resiliency at the cellular level could confer resiliency at the systems level and, ultimately, help individuals to cope with stressors or recover from depressive or manic states. This review will focus on four molecular targets of mood stabilizers that are known to play integral roles in these cellular resiliency signaling pathways: (1) B-cell CLL/lymphoma 2 (Bcl-2), (2) Bcl-2-associated athanogene (BAG-1), (3) glucocorticoid receptors (GRs), and (4) 51 kDa FK506-binding protein (FKBP5). These targets have emerged from neurobiological and human genetic studies and employ mechanisms that modulate GR function or promote anti-apoptotic processes critical to affective resilience. Future research should focus on elucidating sustainable treatments that target resiliency factors—such as BAG-1 or FKBP5—which could ultimately be used to treat individuals suffering from BPD and prevent relapses in afflicted individuals. Further identification of resiliency and susceptibility factors will also be vital. Ultimately, these developments would allow for the treatment of susceptible individuals prior to the development of BPD.