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In addition, the roles of dihydrotestosterone, androstenedione, and other androgenic steroids in depression also warrants further investigation. It is also important to note that none of the men in the Rancho Bernardo Study had testosterone levels in the hypogonadal range. Many early cross-sectional studies reported that total testosterone levels in men begin to decline at the age of 40 by a rate of 0.4% per year 15, 16. Regulation of the hypothalamic-pituitary–gonadal axis, testicular synthesis of androgens, and physiological actions of testosterone resulting from androgen receptor signaling in targeted tissues. Future studies should deepen our understanding of TRTs’ effects on MS in men with testosterone deficiency and those with normal levels along with optimizing therapeutic strategies across a broader spectrum of demyelinating diseases.
A study reviewing the effects of AR antagonism in presymptomatic SOD1- G93A male mice, noted an earlier onset of myofiber atrophy when compared with female mice. Therefore, studies have explored androgen antagonists as a potential therapeutic strategy to modify disease progression. SBMA is caused by CAG expansion at the first exon of the androgen receptor gene. The specific relationship between androgens and hemorrhagic stroke remains under-investigated. Thus, the direct relation between androgen level and homocysteine may act as a potential mechanism for increased cardiovascular events through accelerated atherosclerosis and thromboembolism 18, 19.
This study underscores the importance of stress management and regular physical activity in maintaining healthy testosterone levels. Meghana S. Pagadala (MSP) provided important information about gene variants regulating testosterone that were identified in the GWAS of morning testosterone levels she completed. Recent GWAS research has identified significant associations of GCKR, BAIAP2L1, JMJD1C, FKBP4, SERPINA1, SHBG, FAM9B, and other gene variants with total testosterone levels 21–23, 127 (Fig. 2). Important considerations are that major depressive disorder is a clinically heterogeneous phenotype with depressed individuals differing in inherited polygenic determinants, onset and clinical course, symptom complexes, and comorbidities that contribute to potential multifactorial differences in pathophysiology. The studies reviewed here also suggest that a substantial deficiency in testosterone can cause a depressive-like state that can  respond to TRT. Using PET imaging, a recent study has reported that testosterone regulates hippocampal serotonin 5-HT4 receptors and increases brain serotonergic  function . Other research has found that testosterone promotes an antidepressant response by activating androgen receptor signaling via the MAPK-ERK2 cascade in the hippocampus 12, 117.
Numerous observational studies have linked anti-androgen therapy, commonly used in prostate cancer, with an elevated risk of AD and other neurodegenerative diseases, like Parkinson disease . The following section highlights our current understanding of the role of androgens in certain CNS disorders and their potential therapeutic role across neurological domains. A deeper understanding of the mechanisms involved in neuroplasticity could guide therapeutic interventions with androgens such as testosterone replacement therapy (TRT) in neurological recovery in neurodegenerative diseases. The relationship between androgens and brain development highlights the need to understand their role in neuroplasticity. We examine the role of physiologically derived androgens and androgenic supplements in neurodevelopment and neuroplasticity and delve into the involvement of androgen pathways in the pathogenesis of various neurological disorders. Some studies suggest that fenugreek may help to increase testosterone levels by reducing the enzymes that convert testosterone into estrogen. Given the impact of chronic stress and SNS activation on testosterone levels, natural testosterone boosters can play a role in supporting hormonal balance.
D-Aspartic Acid is an amino acid that plays a crucial role in the production and release of hormones in the body. These ingredients work synergistically to support the body’s natural testosterone production. Prime Male, a popular testosterone booster, contains all of these ingredients, along with others like Korean red ginseng, luteolin, and nettle root. These supplements contain ingredients that support the body’s natural testosterone production. The SNS and testosterone are intricately linked, with each influencing the other in a complex interplay. Furthermore, it can inform the use of interventions, such as testosterone boosters, to potentially enhance physical performance and stress resilience.
These findings suggest that hypogonadal levels of testosterone can dysregulate mood and induce depressive symptoms. Deficient serotonergic neurotransmission and reduced serotonin 5-HT1A and 5-HT1B receptor signaling has an important role in the pathophysiology of major depressive disorder and form the basis of the serotonin hypothesis of depression . Shorter CAG repeat lengths confer higher affinity and sensitivity of the androgen receptor to testosterone and DHT while longer CAG repeat lengths render the androgen receptor less sensitive to androgens 99, 100. Membrane androgen receptor signaling via non-canonical cascades may be especially important in brain neurons and relevant to antidepressant actions of testosterone by promote cell survival, neurogenesis, synaptic density, and synaptic remodeling in the hippocampus, prefrontal cortex, and other brain regions . At present, however, the Testosterone Trials and other studies have only found that TRT can be beneficial in men with dysthymic disorder or subsyndrome depression that does not meet criteria for major depressive syndrome.
The impact of chronic stress and the subsequent activation of the SNS on testosterone levels is well-documented. In times of stress, the body prioritizes the production of cortisol over testosterone, leading to a decrease in testosterone levels. While cortisol is necessary for our survival, chronic high levels can have detrimental effects on health, including a negative impact on testosterone production. Therefore, it is possible that increasing testosterone levels through the use of testosterone boosters could enhance the body’s "fight or flight" response. While research directly examining the effects of testosterone boosters on the SNS is limited, studies have shown that testosterone can influence sympathetic activity. Testosterone boosters, such as Prime Male, are supplements designed to naturally increase testosterone levels.
Following androgen binding, they convert to a nuclear receptor which influences gene expression through binding at specific DNA sequences. These hormones not only play an important role in the development of secondary sexual characteristics and fertility but are increasingly recognized for their role in the development and function of the CNS. In women, a minute amount of testosterone is produced following peripheral conversion of DHEA and androstenedione in the liver, skin, muscles, and fat tissue. It is responsible for formation of external male genitalia in fetus, prostate growth, and plays a role in male pattern baldness. Testosterone is converted into dihydrotestosterone (DHT) by the action of 5-alpha reductase in the prostate and skin. Testosterone is the most potent androgen, produced primarily by the Leydig cells in the testis. Androstenedione acts as the precursor for both testosterone and estrogen.
In preclinical research, androgen receptor signaling in brain regions regulating mood has been reported to have anti-stress and antidepressant effects . The androgen receptor  may not have important roles in the susceptibility to depression or the positive response to TRT if the androgen receptor has less sensitivity to testosterone due to longer CAG repeats 104, 106–108. The TRAVERSE trial is now being completed to determine whether testosterone replacement therapy provides significant benefit in clinical disorders including depression. Randomized, placebo-controlled clinical trials have evaluated the benefit of testosterone treatment in men with major depressive disorder. The mood effect of testosterone treatment has been extensively investigated and meta-analyzed in eugonadal and hypogonadal men with depressive symptoms or major depressive disorder with inconclusive results 20, 26, 35, 50, 75–79.

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