Uptake of EVs has been reported to occur via endocytosis or direct fusion with the acceptor cell membrane39. Consistent with this, EV-contained mitochondria exhibited markedly lower MitoSOX signals (Fig. 5q,r). Functionally, EV-encapsulated mitochondria maintained a responsive MMP, depolarizing with FCCP and hyperpolarizing with oligomycin (Fig. 5l). Staining with MitoTracker Red (MTR) revealed that the majority (77.37 ± 1.92%) of tMac-EVs contained mitochondria (Fig. 5i). Among the 1,057 identified proteins, almost 60% were ascribed as components of mitochondrion (26.35%), plasma membrane (25.99%) and cytoplasmic vesicle (6.56%; Fig. 5f). M,o,q, Scale bars, 3 μm (left) and 2 μm (right; magnified views of the boxed regions).
Scale bars, 3 μm (confocal image) and 0.5 μm (3D reconstruction). LC-EVs were isolated from Cyp17a1Cre; R26tdTomato mice using FACS and then subjected to proteomics analysis. Scale bars, 5 μm (main images) and 2 μm (insets). Together, these data demonstrate that LCs transfer particles to tMacs through EVs. Moreover, mice injected with hCG had a noticeable increase in the proportion of GFP+ tMacs with tdTomato+ particles (Fig. 1l).
Aging increases the levels of mitochondrial stress leading to the increased sensitivity of the mPTP opening. In addition, mitochondria are involved in a variety of other essential cellular functions, such as the maintenance of ion homeostasis, pH regulation, steroid hormone synthesis, and thermogenesis. Mitochondrial Ca2+ overload induces the collapse of mitochondrial membrane potential and the mitochondrial opening of permeability transition pore (mPTP), which triggers the release of pro-apoptotic factors and leads to cell death.
In males, the primary source of estrogen is maintained through the conversion of testosterone to estrogen via the enzyme aromatase (Chen et al., 2005; Gervais et al., 2019; Saldanha et al., 2009). When released from the ovaries, estrogen circulates throughout the body, and crosses the blood-brain barrier to act upon the cells within the brain (Rettberg et al., 2014). Due to the dynamic nature of mitochondria, the changing cellular environment caused by external stimuli alter both the localization (Fang et al., 2012) and structure (Flameng et al., 1980; Rossi and Pekkurnaz, 2019) of the mitochondria within the cell. Finally, review of mitochondria as a biomarker of disease and data supporting efforts in targeting mitochondria as a therapeutic target for the amelioration of these disorders will be discussed.
Engaging in regular physical activity stimulates mitochondrial biogenesis— the process by which new mitochondria form—leading to better hormonal health. When mitochondria are robust, they promote higher energy availability, which correlates with increased hormone production. Mitochondria play a crucial role in the synthesis of testosterone, a hormone essential for muscle growth, energy regulation, and overall health. Understanding how these tiny organelles influence testosterone levels can unlock new insights into health and fitness. However, the relationship between mitochondria and testosterone is a fascinating area that’s gaining more attention. When we talk about testosterone, the conversation usually revolves around its importance for muscle growth, energy, and overall well-being.
Mitochondria play a central role in regulating multiple vital cellular processes involved in energy supply, cellular proteostasis, ROS production, calcium homeostasis, and cell apoptosis (45). Mitochondria-derived ROS include the superoxide anion (O2−), hydrogen peroxide (H2O2), and hydroxyl radicals (OH•) are tightly regulated via mitochondrial and cytosolic antioxidant defenses. The NADH and FADH2 molecules are transferred to the inner mitochondrial membrane and re-oxidized to NAD+ and FAD+ in the electron transport chain (ETC). The common degradation product of fatty acids and carbohydrates in mitochondria is acetyl-CoA, which undergoes a series of enzyme-catalyzed reactions (called the Krebs cycle) in the mitochondrial matrix to generate NADH and FADH2. As the cell’s powerhouse, mitochondria primarily use fatty acid and carbohydrate-deriving substrates to generate reducing equivalents, eventually converted to chemical energy in the form of ATP. On the other hand, fusion allows the transfer of metabolites, enzymes, and gene products between mitochondria for optimal functioning. Dysfunctional and damaged mitochondria can be effectively degraded, eliminated, and recycled via mitophagy.
Analysis of mitochondrial phenotype reveals a shift in the number of agranular and inflamed mitochondria following CRPS and LPS in females, whereas increases in the reactive oxygen species (ROS) protein ROMO-1 were seen only in males. A sex-specific shift in mitochondrial respiration measured from synaptosomes of C56Bl/6 mice was found in females with a history of chronic repeated adolescent stress (CRPS), but not in males, despite showing equivalent increases in anxiety-like behavior in the open field (Shaw et al., 2020b). Although Moro et al. used mitochondria from the liver and not the brain and did not assess cognition, a study by Burstein et al. (2018) found the neural mitochondria of female mice display increased sensitivity of the mitochondrial calcium permeability than that of males, likely due to ERß (Burstein et al., 2018). This action increases the mitochondrial production of COI and NDI, proteins that increase mitochondrial respiration and biogenesis (Mattingly et al., 2008). In a study by Mattingly et al., (2008), their data displayed the role of ERα in mitochondrial function. Sex steroid hormone production is both a regulator and is regulated by mitochondrial activity and functionality.

Gender: Female

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