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Enhancing Neurological Health Through Testosterone Replacement Therapy When it comes to men's health, testosterone plays a crucial role in various bodily... TRT's Effect on Brain Plasticity and Learning Testosterone Replacement Therapy (TRT) is a medical treatment that has gained significant attention in recent... It is not intended to be a substitute for professional medical advice, diagnosis, or treatment.
Using this model in male Sprague-Dawley rats, Leonelli et al. (2007) demonstrated that plasma progesterone levels are reduced in diabetic mice, and chronic treatment with progesterone, DHP, or allopregnanolone were effective in differentially restoring their circulating levels and counteracting impaired nerve conduction velocity of peripheral nerves. Although testosterone can act directly by activating androgen receptors, it can also act through its conversion to other androgenic or estrogenic steroid hormones. However, by using hormone treatments identical to that used in the current study, we have previously demonstrated that the weight of the quadriceps musculature is unaffected in either male (Little et al., 2009; Verhovshek et al., 2010; Huguenard et al., 2011) or female rats (Wilson et al., 2009) by treatment with testosterone.
Newly proliferated neurons from the subgranular zone of the dentate gyrus migrate a short distance into the granule cell layer of the dentate gyrus, where they extend functional axons into the CA3 region of the hippocampus 7,8,9. Determining the neural mechanisms by which new memories are formed is a fundamental question in the field of neurobiology, and the study of adult neurogenesis has provided exciting new insights that directly address this question 1,2. Testosterone ameliorates neuronal apoptosis through inhibition of polymicroglial-mediated neuroinflammation after traumatic brain injury. This neuroprotective potential also has intriguing implications for promoting lifelong cognitive function and resilience. The hormone activates signaling pathways that reduce oxidative stress, inflammation, and cell death while enhancing factors that support neuron health and regeneration after TBI. More research on the long-term efficacy and safety of testosterone therapy is warranted. Testosterone replacement therapy is increasingly used to address age-related testosterone decline.
SCI at the T9 vertebra (T9–11 spinal cord) was intended to preserve the central pattern generators at L1–2 required for locomotor function, and the relevant motoneurons for our analysis. Death is not the only outcome for injured spinal motoneurons, and importantly, the remaining motoneurons after such insults show a variety of morphological and functional changes. Similarly, damage to spinal nerves resulting in laceration and avulsion of spinal roots (e.g., cauda equina injury with high-impact motor vehicle accidents, Moschilla et al., 2001) can lead to the death of motoneurons and preganglionic autonomic neurons in the spinal cord, resulting in autonomic and motor dysfunction (Hoang et al., 2003). Here we assessed whether testosterone might have similar beneficial effects after spinal cord injury (SCI). Some evidence indicates that BDNF is activated by androgens, but there is currently little evidence that testosterone upregulates BDNF in the dentate gyrus through a direct pathway.
This lack of effect with testosterone treatment is similar to that observed by Kachadroka et al. (2010), wherein the percentage of white matter sparing at the lesion epicenter as a consequence of treatment with estradiol was not affected by the presence or absence of endogenous androgens. More importantly, such atrophy could be almost completely restored after testosterone treatment, indicating a protective role of testosterone on prevention of motoneuron dendritic degeneration after SCI. Testosterone treatment protects motoneurons from injury-induced atrophy (Fargo et al., 2009a). Following contusion injury, quadriceps motoneurons underwent marked dendritic atrophy (Fig. 2). In sham animals, the number of motoneurons within the identified quadriceps range averaged 1,054.75 (± 202.96).
A T9 laminectomy was performed to expose the underlying thoracic spinal cord segment(s), and animals received a severe (a 10-g weight dropped from a height of 25 mm) contusion injury by using an NYU impactor. Gonadal steroid hormones provide protection from many of the pathophysiological changes seen after SCI, for example, by reducing the inflammation and free radical generation that contribute to progressive secondary injury. In the United States, more than 10,000 people per year survive a spinal cord injury (SCI); 45% suffer from spinal motoneuron lesions, and this number rises to 95% for those with lumbar or sacral injuries (Doherty et al., 2002). Soma volume, motoneuron number, lesion volume, and tissue sparing were also assessed, as were muscle weight, fiber cross-sectional area, and motor endplate size and density. In vitro experiments indicate that testosterone acts as a neuroprotectant, with activation of the MAPK pathway playing a key role.
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