Mental depression: Relation to different disease status, newer treatments and its association with COVID-19 pandemic (Review)
- Authors:
- Published online on: October 8, 2021 https://doi.org/10.3892/mmr.2021.12479
- Article Number: 839
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Copyright: © Abdel-Bakky et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
Abstract
Introduction
Mental depression is a common psychiatric disorder, where ~264 million individuals of different ages suffered from depressive behavior at January 2020 with ~800,000 annual suicides (World Health Organization, WHO) (1). Although depression has been extensively studied, its mechanisms remain to be elucidated. Norepinephrine and serotonin are two neurotransmitters considered to be the most efficient in mental depression (2). The areas in the brain supposed to be affected include the temporal and frontal lobes and the cingulate gyrus of the limbic system (Fig. 1) (3). The symptoms of depression are mostly mild and unpredicted either by patients or even physicians. The typical types of depression, whether major or minor, have only symptoms of depression (4). However, bipolar and cyclothymic types are accompanied by manic symptoms (5). According to the American Psychiatric Associations of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), depressive disorders are classified into three common types based on a theoretical basis; the first type usually occurs due to stressful stimuli. The second type is genetically based and termed endogenous depression; it is demonstrated through patient difficulties in dealing with normal life (6). The third type is bipolar depression (or manic-depressive disorder).
By contrast, the International Alliance on Mental Illness classifies depression into nine common types; Major Depression: patients with this type feel excessive sadness, lack of energy, irritability, hopelessness, physical pain, lower concentration, alterations in eating or sleep habits, feelings of guilt and attempted suicide. Only two weeks of suffering these symptoms are needed to officially diagnose major depression (7). Dysthymia is a type of depression that causes persistent low mood with changes in sleep habits, sadness, trouble in concentration, fatigue and appetite loss. Talk therapy, not medication, is usually suitable for this type of depression (8). Postpartum depression (PPD) usually happens after birth where the patient typically suffers from loneliness, hopelessness, deep sadness, fatigue, fear about baby disconnection and fears about harming her newborn (9). Seasonal Affective Disorder generally occurs in winter, probably due to a shortage of sunlight. Symptoms are generally mild to severe. This type usually lasts in spring and natural or artificial light is usually the suitable treatment (10).
Atypical Depression is commonly associated with physical symptoms, including a sense of heaviness in the legs or arms together with being overweight and problems with social communication (11). Psychotic Depression is characterized by psychological symptoms including delusions, and auditory and visual hallucinations (12). In Bipolar Disorder, patients have a cycle of depression and mania symptoms. It is classified into bipolar I (where patients have at least one manic episode) (13); bipolar II (where patients have hypomania as well as depression) (14) and cyclothymia, a cycle of depression followed by a cycle of mania (15). Premenstrual Dysphoric Disorder occurs in females during the last 2 weeks of the menstrual cycle (16). Situational Depression is related to certain stressful situations and the symptoms are unhappiness, anxiety and perhaps major depression (17) (Fig. 2).
Depression can be treated by non-drug or drug-containing therapy. None-drug treatment includes encouraging creativity, physical or alternative therapy including exposure to sunlight, St. John's Wort and acupuncture (18). On the other hand, well-known antidepressant drugs including selective serotonin reuptake inhibitors (SSRIs), tricyclic antidepressants (TCAs), norepinephrine reuptake inhibitors (NRIs), serotonin antagonist and reuptake inhibitors (SARIs) and serotonin-norepinephrine reuptake inhibitors (SNRIs) are used (19). However, efforts have been made to find new antidepressants with high efficacy and faster response, fewer side effects, able the preserve sexual functions in patients, improved efficacy, rapid onset and improved safety profile. Mental health problems resulting from the COVID-19 pandemic comprise insomnia, anxiety, stress, fear and depressive behavior (20). So far, there have been no data about the changes in cognitive functioning or emotions from the direct effects of the virus on the brain. A proportion of the world's population are in health quarantine and isolated at home and have lost their jobs, family members, relatives, colleagues, or friends. Consequently, depression associated with COVID-19 can be included under a situational or emotional type of depression.
Epidemiology
According to the World Health Organization (WHO), 264 million individuals worldwide suffer from major depression. Almost 800,000 suicides are counted each year and it is the second leading cause of death among young individuals (21). Adolescents aged between 12 and 17 years exhibit the highest rate of major depressive episodes (11.3%) followed by young adults between 12 and 20 years old at 9.6% (22). It has been observed that adults >50 years of age are less likely to have major depressive episodes (4.5%) (23). The rate of moderate to severe depression increased from 23.2 to 41.1% from 2007 to 2018 (24). It is noted that the prevalence of depression among women is almost twice as high as that of men (25). Despite the availability of effective antidepressants with multiple mechanisms of action, it has been observed that between 76 and 85% of individuals who belong to developing countries do not receive any treatment for depression (25,26).
Biological markers and clinical presentation of depression
There are no specific biological markers for depression. Various medical and psychiatric disorders, as well as certain drugs, have been noted in patients with depressive illness (Table I) (27).
In all, 25% of patients with a chronic medical history, including cancer, diabetes, or cardiovascular diseases, develop depressive disorder without a clear and accurate diagnosis for depression (28). According to the DSM-5, the symptoms of major depression are sadness, anxiety or irritability, feelings of guilt and suicidal thoughts (29). The clinical presentation could be classified into emotional and physical symptoms. Emotional symptoms include stress, sadness, anxiety, or feeling guilty, whereas physical symptoms may include sleep disturbance, appetite changes, headache, pain, or fatigue (Table II).
Depression and common medical diseases
Depression can cause several medical diseases, including Alzheimer's (by 2.0-fold) (30), cardiovascular diseases (1.5–2.0-fold) (31), stroke (1.8-fold) (31), epilepsy (4.0–6.0-fold) (32), diabetes (1.6-fold) (33) and cancer (1.3–1.8-fold) (34) (Fig. 3). Drugs used in controlling depressive illness have multiple unwanted effects, including increased weight, sedation, sexual dysfunction, indigestion, or decreased blood pressure. Incompliance or stopping medication may cause a relapse of the symptoms of depression and pose a risk of attempted suicide (35).
Depression and the metabolic diseases
Depression is usually accompanied by metabolic syndrome, obesity and type-2 diabetes (36,37). In diabetes, ~20.9% of males and 27% of females exhibit major depression in western Kenya (38). By contrast, depression may increase the risk for diabetes (33). Gastrointestinal hormones, including ghrelin, leptin and the lipid endocannabinoid, may regulate mood in the case of depression (39). Improving the depression symptoms has been accompanied by inhibition of cholecystokinin receptors in mice and also inhibits the hyperactivity of the hypothalamic-pituitary-adrenal axis (40). Neuroendocrine, noradrenergic and serotonergic are controlled by the galanin neuropeptide systems in depression and anxiety-related behaviors (41). Furthermore, hippocampal neurogenesis is induced by an insulin-like growth factor (IGF) and the disturbance of neuronal IGF results in depression (42). Regulation of synaptic plasticity and improving depressive behavior results from releasing gastrin-releasing peptide in the hippocampus (43) (Fig. 4).
Depression and endocrine disorders
Cushing's syndrome and hypothyroidism are accompanied by a high rate of psychiatric morbidity (44). Secondary hypothyroidism is normally characterized by decreased blood level thyroid-stimulating hormone, which is concomitant with an increased risk of depressive episodes (45). It is found that 40% of patients with hypothyroidism suffer from clinical depression (46,47). Hyperthyroidism patients have a high risk of depression by 28% compared with normal individuals, whereas it occurs in 50% of all cases of patients with hypothyroidism (46,48). Blood and cerebrospinal levels of T4 are relatively increased during the depression (46) (Fig. 5). The raised concentration of corticotropin-releasing factor in cerebrospinal fluid in patients with depression is noted in a previous study (49).
Depression and cardiovascular diseases
Decreased plasma volume and elevation in blood viscosity lead to a higher risk of depression (50,51). Patients with depression have a high risk for hypertension, congestive heart failure and myocardial infarction (52). Hypercoagulability, platelet activation and D-dimer proteins can be detected in patients with depression (50,53,54). In clinical trials, the risk of depression is significantly reduced in cardiovascular disease patients treated with statins (50,55). It has been demonstrated that vascular endothelial growth factor has neurogenic/neuroprotective effects (50,56,57). Furthermore, its level is notably increased in patients diagnosed with depression (58,59).
Depression and inflammatory status
Depression increases cytokines, IL-6, TNF-α and IL-1 (60). Furthermore, stress regulates prostaglandin-E2, lipid peroxidation IL-1β, cyclooxygenase-2 and Toll-like receptor-4 (Fig. 6). A previous study demonstrates that celecoxib can be used as a new strategy for major depression, especially bipolar disorder (61,62). In addition, Nery et al (63) describe the antidepressant action of celecoxib, which is characterized by its rapid-onset antidepressant activities. Sesamol, a potent antioxidant and cytokine inhibitor, has been shown to improve chronic stress-induced depression in an experimental mouse model (64).
Depression and daylight
Deficiency of light has been shown to suppress neurogenesis and increase symptoms of depression (65). Nocturnal melatonin, vitamin D and platelet 5-HT values are induced by environmental light and improve depression symptoms (66,67). Melatonin has anti-oxidative effects, increases sleep propensity and has been known to decrease alertness and attenuate weight gain (68) (Fig. 7).
Depression in the deficiency state
Intake of omega-3 fatty acids, fish, vitamin B6, vegetables, fruits, folate, olive oil, vitamin B12, nuts and legumes improves depressive symptoms although the exact mechanism remains to be elucidated (69,70).
A previous study demonstrates that unipolar depression can be effectively controlled by folic acid (71). A study conducted on >70 patients showed that major depressive disorder in non-responders to SSRIs could be improved by s-adenosyl methionine if taken concurrently with serotonin reuptake inhibitor (72) (Fig. 8).
Depression and glutamate
The ionotropic glutamate receptors N-methyl-D-aspartate (NMDA), α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid and metabotropic glutamate receptors (mGluR1 to mGluR8) activation regulate synaptic plasticity and transmission. Glutamate is cleaned by high-affinity excitatory amino acid transporters (EAAT) 1 and 2 from extracellular space found in glial cells (73).
Following the conversion of the glial cells glutamate to glutamine, by glutamine synthetase, glutamine is hydrolyzed into glutamate via glutaminase (74). In experimental animal models of depression, drugs that increase glutamate clearance can improve stress and possess antidepressant effects (75,76).
Ketamine N-methyl-D-aspartate receptor antagonist in subanesthetic dose (0.5 mg/kg) has a short onset antidepressant effect (77). Another rapid-acting antidepressant is dextromethorphan (NMDA receptor antagonist) (78). The antimuscarinic drug scopolamine has short onset with a potent antidepressant effect for bipolar and major depression (79,80). As with NMDA receptor antagonists, zinc and magnesium have an antidepressant effect in experimental animal models (81). It has been stated that magnesium has an antidepressant effect in type II diabetic patients, compared with imipramine (82).
Depression in neurodegenerative cases
Long-time stress may negatively affect the process of neurogenesis and cause neuronal loss in the hippocampus (83,84). In depressive behaviors, synaptic plasticity has been revealed to be controlled by brain-derived neurotrophic factor (BDNF) (85,86). The blood level of BDNF is decreased in patients with depression and its level is increased by antidepressant drugs (87,88).
In patients with depression, a decreased level of vascular growth factor (VGF) has been shown (89) and an antidepressant effect is produced by treatment with recombinant VGF in an experimental animal model (90). Neurotrophin-3 and nerve growth factor may contribute to the antidepressant responses by improving plasticity and neurogenesis in the hippocampus (91,92). Other factors such as glial cell line-derived neurotrophic factor and fibroblast growth factor-2 are modulated in depression (58,93) (Fig. 9).
Depression and oxidative stress
In patients with depression, numerous enzyme-mediated reactive oxygen species (ROS) production is increased (94). Superoxide and hydrogen peroxide are products of oxidation of xanthine mediated by xanthine oxidase enzyme that has been found to increase in the thalamus in postmortems of patients with depression (95). Metabolism and oxidative deamination of serotonin are exaggerated by monoamine oxidase, which can cause ROS production leading to mitochondrial dysfunction and neuronal apoptosis (96). In addition, COX-2 is involved in the inflammatory cascades and its inhibitors can lead to neuronal inflammation that may worsen depression (97). Decreased superoxide dismutase activity is shown in patients diagnosed with depression (98). Peroxides, such as hydrogen peroxide catalyzed by glutathione peroxidase, have lower activity in patients with depression compared to healthy individuals (99). Microglia are the main inflammatory neuronal cells that are activated by the increased levels of superoxide and other ROS (100). This activated cell releases a number of inflammatory cytokines, mostly TNF-α and IL-6 (101).
It has been demonstrated that an increased level of nitric oxide (NO) mediates the 3′,5′-cyclic guanosine monophosphate (cGMP) signaling pathway leading to depressive symptoms; however, the reduction of NO and/or cGMP results in improvement in depression-like symptoms in experimental animal models (102). The elevated level of NO may react with superoxide anions and produce highly reactive inflammogenic and neurotoxic peroxynitrite and consequently a local surge in inflammatory cytokines (103). The previous NO effects are involved in the pathogenesis of major depression (104), Parkinson's disease and Alzheimer's (103).
Gene expression in depression
There are differences in the cortical gene expression in patients with schizophrenia, bipolar disorder and autism including differentiation of the glial cell and metabolism of fatty acid (105,106). Notably, the pathophysiology of major depression (MD) involves inflammatory pathways and the hypothalamic-pituitary axis (107). Another study found low expression of two genes, ATP binding cassette subfamily G member 2 and prominin 1 in patients with MD (108). Similarly, a low level of mRNA encoding the gene Fli-1 proto-oncogene, ETS transcription factor has been found and it serves a role in the growth of the neuronal crest in patients with depression (109). Reduction in the expression of SLC1A2 and SLC1A3 genes has been found in the dorsolateral prefrontal cortex and anterior cingulate of patients with MD and bipolar disorder (110). A lower expression of NMDA receptor subunits was found in patients with MD including PSD-95, NR1, NR2A and NR2B in the anterior prefrontal cortex (111). GABA signaling-related genes such as ALDH9A1 and glutamate ammonia ligase, are changed in patients with depression (112). ALDH9A1, which catalyzes the conversion of γ-aminobutyraldehyde into GABA, was increased in depressed subjects, whereas glutamate ammonia ligase, which increases glutamate brain clearance by its conversion to glutamine, was decreased in depressed brain. Furthermore, decreased activation and functions in the gene expression of the extracellular signal-regulated kinase (ERK) cascade is recorded in MD (113). Several deviations in the gene expression in MD were found to be gender-specific, occurring mostly in females. For instance, hub gene Dusp6 (female-specific gene) is downregulated in female, but not male mice prefrontal cortex simulated stress by increasing pyramidal neuron excitability and ERK signaling. This gender-specific feature in MD patients could be due to changes in the specificity of ventromedial cortex content of phosphatase 6 in female patients and empty spiracles homeobox 1 in males (113).
Treatment of depression
None drug treatment
Encouraging creativity
Reading books or journals, gardening, painting and playing music can offer a passage to drive out the painful thoughts and bad moods. It is known that creative individuals are at high risk for depression than non-creative ones (114).
Physical therapy
In this, patients with depression are directed to perform physical exercise. The only challenge facing this strategy is that patients with depression often suffer from a lack of energy. However, starting a new physical activity can be influential in managing such symptoms. Performing physical exercise is known to produce euphoria by releasing endorphins (115).
Psychiatric therapy
Cognitive Behavioral Therapy is a common psychotherapy strategy used in the treatment of depression. This strategy directs patients to correct negative non-constructive thinking (116).
Alternative therapy
A 40 min exposure to sunlight by patients suffering from seasonal depression results in a good response (117). This type of therapy may be helpful in patients suffering from seasonal depression. St. John's Wort and acupuncture are used and can improve depressive behavioral symptoms (118).
Antidepressant drugs
Most antidepressants employ important activities on the metabolism of monoamine neurotransmitters and their receptors, mainly norepinephrine and serotonin (119). The well-known antidepressant classes include SSRIs, TCAs, NRIs, SARIs, SNRIs and noradrenaline and dopamine reuptake inhibitors (Table III,Table IV,Table V,Table VI,Table VII,Table VIII,Table IX) (120).
Other antidepressants
LY03005 (Ansofaxine hydrochloride)
Ansofaxine is developed by Luye Pharma Group for the treatment of major depression. The American food and drug administration (FDA) approved the serotonin-norepinephrine-dopamine triple reuptake inhibitor LY03005 in December 2020 under the name of Ansofaxine (121). It was developed under Luye pharma's new chemical and therapeutic entities research and development platform (122). Triple reuptake inhibitors encourage a class of antidepressants and are considered to have high efficacy and faster antidepressant response. They have relative advantages in preserving patients' sexual functions, improved efficacy, rapid onset and improved safety profile (122).
Duloxetine
Duloxetine hydrochloride (Cymbalta) is an oral selective serotonin and norepinephrine reuptake inhibitor. It has been accepted in the treatment of different mental disorders, including depressive behavioral illness (123). One important benefit that leads to the use of duloxetine in the treatment of depression is its effect in the prevention of suicidal thoughts and attempts (124). Wu et al (125) demonstrate that duloxetine may be effective in the treatment of epileptic patients with depression. A recent study demonstrated that a spray-dried complexation-based transdermal patch of duloxetine functions as a possible new drug delivery system in the treatment of depression (126).
Vilazodone (Viibryd)
Vilazodone was approved by the FDA in January 2011 and it is the first and only selective serotonin reuptake inhibitor and 5-HT1A receptor partial agonist (127). A large dose of vilazodone is accompanied by acute serotonin syndrome. Some serious uncommon adverse effects include suicidal thoughts, sexual dysfunction, manic behavior, serotonin syndrome and hyponatremia (128).
GLYX-13 (Rapastinel)
GLYX-13 finalized phase II in 2015 and on January 29, 2016 Allergan company reported that Rapastinel had received approval from the FDA for treatment of major depression (129). GLYX-13 functions by controlling the neuronal N-methyl-D-aspartate (NMDA) receptor. Although it is similar to ketamine receptor antagonists of NMDA, GLYX-13 does not cause severe adverse effects such as schizophrenic symptoms and hallucinations effects (130).
Vortioxetine (Brintellix)
Brintellix, used for the treatment of major depression, is recently available in the United States markets (131). The antidepressant mechanism of Brintellix remains to be elucidated. Vortioxetine is a 5-HT1D, 5-HT3 and 5-HT7 receptors antagonist, 5-HT1B partial receptors agonist and 5-HT1A receptor agonist (132). Plasma concentration of BDNF shows a significant increase and the concentration of platelet 5-HT displays significant reduction following Brintellix administration in patients with major depression (129).
Agomelatine (Valdoxan)
Valdoxan targets the melatonin system in the brain and is considered a melatonergic drug. It was approved for the treatment of major depression in Europe in 2009. It has been recently reported that Agomelatine is effective in PPD treatment and is safe during breastfeeding (133). Agomelatine works by targeting the neuronal effects of melatonin, which has an essential role as an antidepressant. Similar to serotonin, agomelatine appears to be important in controlling sleep and circadian rhythms (134,135).
Ketamine
It is an anesthetic drug that has an antidepressant effect but is not yet accepted as an antidepressant by the FDA. Ketamine acts on a number of central nervous system receptors responsible for learning and memory. These receptors work on the excitatory neurotransmitter, glutamate (136), which activates mTORC1 kinase via inactivation of eukaryotic initiation factor 4E-binding proteins (137). Intranasal spray of ketamine was FDA approved as an antidepressant. Finally, the safety and efficacy of ketamine in depression control requires further investigation (138).
Levomilnacipran
Levomilnacipran is a rapid onset drug used for treatment of depression that belongs to a class of SNRIs. There is no evidence to indicate any relative advantages of levomilnacipran compared with available SNRIs (139). A recent study demonstrated that levomilnacipran in older patients with depression has lower tolerability than in older adults with depression. Levomilnacipran requires to be more deeply studied to analyze its efficacy and tolerability in patients with depression (140).
Quetiapine (Seroquel XR)
Although it inhibits nerve communication between the brain areas, like other atypical anti-psychotics, the mechanism of quetiapine remains to be elucidated. A promising result of SNRI (Venlafaxine) and Quetiapine co-treatment in patients with depression has been reported (141). The benefits of Quetiapine may be due to inhibition of the serotonin type 2 and dopamine type 2 receptors (142). Hazards of mortality, suicidal thoughts and stroke in the elderly are common among patients treated with Quetiapine (143).
COVID-19 and depression
The outbreak of COVID-19 seriously influences mental health. The pandemic represents a stressful situation worldwide and at the time of writing this review, the confirmed cases are >177,108,695 including 3,840,223 mortalities (WHO; http://covid19.who.int). Mental health problems resulting from this pandemic include insomnia, anxiety, depressive behavior, stress and fear (144). In the aftermath of the COVID-19 pandemic, depression and anxiety are common psychological complaints (145). Lai et al (146) observed the mental health status during the COVID-19 pandemic in 1,257 doctors and other healthcare staff in China. It was found that 71.5% of the study sample claimed distress, 50.4% depression, 44.6% anxiety and 34.0% insomnia. In addition, a possible correlation between the symptoms in COVID-19 patients and potential neurological consequences has been found (147). At present, nothing is known about the changes in cognitive functioning or emotions from the direct effects of the virus on the brain. A number of individuals are in health quarantine and isolated at home and have lost their jobs, family members, relatives, colleagues, or friends. Accordingly, depression due to COVID-19 may be included under the situational or emotional type of depression.
There are a number of drugs under investigation in different research institutes, universities, or under clinical trials in hospitals. The investigational drugs include Baricitinib, interferon-β 1b, Bemcentinib, Bevacizumab, chloroquine phosphate, Colchicine, Dexamethasone, EIDD-2801, Favipiravir, Hydroxychloroquine, Azithromycin, anticoagulants, Lopinavir, Ritonavir and Remdesivir. The current use of some of these drugs in certain areas is marked with hopes and promises without attention being payed to their behavioral side effects and lethality. For example, Baricitinib (Olumiant R which is a Janus kinase inhibitor now in phase III clinical trials for COVID-19 treatment and has been used in the treatment of rheumatoid arthritis. Olumiant may occasionally lead to depression as a side effect (148).
Another drug that has been used recently in the treatment of COVID-19 is interferon-β 1b. Clinical studies on the efficacy of interferon I α and interferon β in SARS-CoV had differing results. Interferon-β 1b may increase the speed of COVID-19 viral clearance (149). The most serious side effects of interferon-β-1b in clinical trials are attempted suicide, depressive behavior and necrosis at the site of injection (150). Dexamethasone is a common and widely used synthetic steroid for a number of diseases, which can reduce mortality of seriously ill COVID-19 patients although with no improving effect in less serious cases (151). Fortunately, Dexamethasone level has previously been shown to possess a good prognosis for endocrine dysfunction in depression (152).
The United States FDA has approved the use of the antimalarial drugs chloroquine (N4-(7-chloro-4-quinolinyl)-N1,N1-diethyl-1,4-pentanediamine) and hydroxychloroquine sulfate (a derivative of chloroquine) in COVID-19 treatment regardless of a questionable clinical proof of their effectiveness (153). Behavioral changes, delirium and depression have been associated with chloroquine use (153). One of the most important points that must be taken into account is the older population, who are directed to self-isolate for a long time. This is to protect over-loaded health systems and to diminish the outbreak of COVID-19. This social isolation not only increases the risk for neurocognitive, cardiovascular and autoimmune diseases but also exposes elder populations to a greater risk of depression (154). Decision makers and leaders need to realize the resultant mental health changes. In addition, they must take the situational depression existing at present into their consideration and give it the care and attention it deserves.
Depression and cytokine storm in COVID-19
Alteration in consciousness is one of COVID-19 manifestations and accounts for 20% of patients (155). Furthermore, increased incidence of psychiatric disorders has been identified during and after the infection with COVID-19 (156). Most of these patients display cytokine storm or cytokine release syndrome and showed raised plasma levels of pro-inflammatory cytokines including IL-2R, IL-6, IL-8, IL-10 and TNF-α (157). Depression is known to be an inflammatory state in which the patients manifested high levels of inflammatory cytokines, normalized after anti-depressants treatment (158). In the central nervous system and the peripheral blood, elevated levels of IL-1β, IL-6, IL-8, CRP and TNF-α cytokines are identified in patients with depression (159). Blocking of cytokines by IL-1β receptor antagonist, Anakinra or IL-6 receptor antagonist Tocilizumab (160) has benefits on the inflammation-mediated respiratory failure in patients with depression. Based on the previous reports, the present study suggested the protective effect of cytokine blockers against depression symptoms in COVID-19 patients.
Summary
Treatment of depression remains a great public mental health problem. Depression comprises different types, some of which are related to events in a person's life while others are related to the chemical changes in the brain. In some cases, depression may be considered as a risk factor for certain diseases (e.g. type 1 or 2 diabetes), and in other cases, certain diseases (e.g. Alzheimer's and epilepsy) may lead to depressive episodes. Thus, the relationship between such diseases and depression was discussed in the present study. In addition, the newer treatments of depression, such as modulation of glutamatergic, neuronal NMDA and serotonergic systems and triple reuptake inhibitors, were also presented. The newer treatments result in a lower risk of suicidal attempts compared to older treatments. However, they still have some risks including the possibility of drug abuse. Cooperation between governmental organizations, researchers, clinicians, patients and family is crucial in future progress.
Until now, nothing has been known about the direct effect of COVID-19 on the brain. What health care staff can do is to treat depression resulting from COVID-19 infection and its complications, if there are any. The challenge facing health care staff is to treat the so-called defeat stress resulting from the consequences of COVID-19 infection. Defeat stress consequences may not be able to respond to the classical antidepressants which include maladaptive behaviors (161,162). COVID-19 patients need both pharmacological treatment and mental care. Mental health personnel have to be close to COVID-19 patients directly or indirectly through the internet video media or telephone to soothe or prevent waves depression or low moods. Decision-makers and officials all over the world need to know that emotional or situational depression has to be taken seriously.
Acknowledgements
Researchers would like to thank the Deanship of Scientific Research, Qassim University for funding the publication of this project.
Funding
Researchers would like to thank the Deanship of Scientific Research, Qassim University for funding the publication of this project.
Availability of data and materials
Not applicable.
Authors' contributions
MSAB conceived, designed, analyzed and presented diagrams, wrote and revised the review. AHA and EA constructed diagrams, wrote and revised the review. TMF wrote and revised the review. Data authentication is not applicable. All authors read and approved the final manuscript.
Ethics approval and consent to participate
Not applicable.
Patient consent for publication
Not applicable.
Competing interests
The authors declare that they have no competing interests.
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