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Depression, Mental.

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Major depressive disorder (MDD) is a complex and heterogeneous disorder, phenotypically and biologically. MDD may be caused by complex interaction between genes and environment in susceptible individuals. Thus, a combination of certain genetic polymorphism, environmental stress, and personal susceptibility ultimately may induce MDD. Gene-environment interactions in the pathophysiology of MDD lead to advancement in personalized medicine by means of genotyping for inter-individual variability in drug action and metabolism. Gene-environment interactions may explain why some subjects become depressed while others remain unaffected. The aim of this book is to describe current knowledge of MDD from the point of view of neurobiology, molecular genetics and cognition. The authors address a deep understanding of cognitive and neurobiological mechanisms involved in MDD.

Depression, Mental --- Psychological aspects --- Dejection --- Depression, Unipolar --- Depressive disorder --- Depressive psychoses --- Melancholia --- Mental depression --- Unipolar depression --- Affective disorders --- Neurasthenia --- Neuroses --- Manic-depressive illness --- Melancholy --- Sadness --- Neurosciences --- Bipolar disorder

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Major depression is a highly prevalent disorder that poses a significant social burden in society nowadays. The pathophysiology of this disease is still poorly understood but growing evidence suggests that impaired neuron and glial plasticity may be a key underlying mechanism for the precipitation of the disorder. One of the most surprising findings in this field was the involvement of glial cells in the pathophysiology of major depression and in the action of antidepressants, namely in mechanisms related with adult neurogenesis imbalances or dendritic arborization impairments. In particular, several works refer to alterations in the morphology and numbers of astrocytes, microglia and oligodendrocytes in the context of depression in human patients or animal models of depression. These observations were linked to functional evidences and suggested to underlie the pathophysiology of depression. Among others, these include impairments in the cross-talk between glia and neurons, changes in the level of neurotransmitter or immunoactive substances, myelination status, synapse formation, maintenance, or elimination. In addition to the implication of glia in the pathophysiology of depression, a number of studies is ascribing glia pathways to classically accepted antidepressant mechanisms. Therefore, it is noteworthy to elucidate the role of glia in the effect provided by antidepressant treatment in order to better understand secondary effects and elucidate alternative targets for treatment.

Neuron --- oligodendrocyte --- antidepressant --- Depression --- astrocyte --- Microglia

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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

affective neurocircuitry --- affective neuroscience --- depression --- oxytocin --- serotonin

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Depressive disorders can be seen as a disturbance to the balance of mind and body. Because it is a mental disorder and psychiatry is a branch of medicine, the question how mind and body interact in depression should be treated as a medical rather than metaphysical mind-body problem. The relation between mind and body as it pertains to this illness should be construed in teleological rather than causal terms. Mental states like beliefs and emotions serve an adaptive purpose by constraining the physiologic systems involved in the body's stress response, thus preserving homeostasis and protecting us from various disorders. Depression results when the mind fails its constraining role.

Depression. --- Depression, Mental. --- Dejection --- Depression, Unipolar --- Depressive disorder --- Depressive psychoses --- Melancholia --- Mental depression --- Unipolar depression --- Affective disorders --- Neurasthenia --- Neuroses --- Manic-depressive illness --- Melancholy --- Sadness --- Medicine --- Neuropsychiatry --- Mental and Behavioural Disorders and Diseases of the Nervous System --- Health Sciences --- Bipolar disorder