Optogenetics is a biological technique that uses light to control the activity of specific cells, particularly neurons, with high precision. By introducing light-sensitive proteins known as opsins into targeted cells, researchers are able to activate or inhibit cellular activity in real time. This ability to control biological processes with both spatial and temporal precision has made optogenetics a powerful tool in modern biomedical research.
Research into the effects of microgravity on plant development bolsters the evolution of bioregenerative life support systems (BLSS), which are essential to foster extended life in space. However, microgravity, ionizing radiation, and hypomagnetic conditions on space vessels induce abnormal phenotypes that inhibit plant functionality in these systems. Microgravity has been tied to increased levels of reactive oxygen species (ROS) and phenolic compounds, the latter produced in response to oxidative stress. Microgravity additionally appears to influence germination and elongation success, though current studies exhibit high variability by species. To mitigate the effects of microgravity on plants, researchers can apply directional stimulation via phototropism or strigolactone exudation. Additional research is needed to build on this field, as current studies involve high variability in testing conditions, species, and equipment.
In 2023, over 700 women died daily from childbirth-related causes around the world [13]. Maternal deaths during childbirth are linked to postpartum hemorrhage and infection [18]. Childbirth is a major event in a woman’s life, and having a strong understanding of different labor practices allows mothers to enter the experience better equipped to navigate their birth [1]. One often overlooked aspect of childbirth is the use of birthing positions, which play a critical role in minimizing the rate of postpartum infections and bleeding [1].
This literature review explores the impact of increased dietary fiber intake, compared with a low-fiber diet, on gut microbiota composition in adults with symptoms of mood disorders. This uses seven central studies, including randomized controlled trials, a long-term cohort study, and a systematic review. These studies showed that higher fiber intake is associated with improved mood symptoms and increased microbial diversity, particularly with whole-diet interventions rather than supplementation alone. There is a broad correlation between fiber intake and reduced symptoms of depression and anxiety in observational studies, while dual-outcome trials measuring both mental health and gut microbiome outcomes demonstrate that fiber modulates gut behavior and supports the gut-brain axis. Although many sources carried propitious results, most trials had short durations, small sample sizes, and lacked standardized fiber interventions, limiting the ability to establish causality. A critical gap in the literature exists because only one study directly measures both gut microbiome composition and psychological outcomes. Despite these limitations, this review suggests that dietary fiber intake has high potential as an accessible strategy to alleviate symptoms of mood disorders by enhancing gut microbiota composition. Future research should prioritize long-term, large-scale trials with standardized interventions and dual-outcome endpoints to establish fiber as a non-pharmacological treatment for mood disorders.
According to Woolf and associates, U.S life expectancy increased from 69.9 years to 78.9 years between 1959 and 2016 [1]. With increasing age comes an array of medical morbidities, including cardiovascular disease, malignancy (cancer), and what some would argue as the most debilitating, cognitive decline [2].
Fetal Alcohol Syndrome Disorder (FASD) is characterized by a set of behaviors that are brought on by fetal alcohol exposure during utero, causing an abnormal neurodevelopmental process [3]. Despite it being preventable, approximately 2% to 5% of United States schoolchildren are impacted by prenatal alcohol exposure (PAE), with 6-9 out of 1,000 actually being diagnosed with this disorder [1,2,3]. Severe consequences of fetal ethanol exposure consist of miscarriages, stillbirths, and premature delivery [2].
Complex regional pain syndrome (CRPS), a neuroinflammatory disease, ranks number one on the McGill Pain Scale, topping fibromyalgia, cancer, and amputation without anesthetics. The development of CRPS typically occurs after trauma to the arm or leg (e.g., breaking of a bone, dislocation of a joint, surgical trauma to a limb) that results in a disproportionately high sensation of pain. This painful response is chronic and characterized by constant pain with additional flare-ups that last different amounts of time from person to person.
Alzheimer’s disease is a progressive neurodegenerative disorder that affects an estimated 6.9 million Americans today, a figure expected to rise significantly with population aging [1]. As the most common cause of dementia, Alzheimer’s is a leading contributor to disability and dependency among older adults, placing an immense burden, both mental and fiscal, on patients, families, and healthcare systems. In 2023, over 11 million informal and unpaid caregivers in the U.S. provided 18.4 billion hours of care, valued at $346.6 billion [1].
Age-related neurodegenerative disease pathogenesis remains a hot topic for scientists as there are many ways to approach it: genome instability, protein misfolding, and neuronal defects, to name a few. There is, however, a consensus that dysfunctional autophagy is ubiquitous in neurodegenerative disease. Autophagy, the degradation of intracellular material, maintains homeostasis amidst cellular stress, yet its efficiency is lowered in diseases like Alzheimer’s and Parkinson’s. As cell stress accumulates over natural aging, how autophagy fails under cell stress overload is a key question for researchers. In neurodegenerative disease, there are multiple cell stressors present, three of which we will address: nutrient stress, endoplasmic reticulum (ER) stress, and mitochondrial stress. This review will examine three major autophagy pathways that respond to these stressors respectively—lipophagy, ER-phagy, and mitophagy—and their relationship with one another. Research typically focuses on individual autophagy mechanisms, but there is a lack of research on how these autophagy pathways relate to one another. We identify the nuclear-ER-vacuole junction as an intersection between lipophagy and ER-phagy, but it is harder to connect mitophagy with the two. While mitophagy also requires core autophagy machinery, it specifically relies on the cortical-ER instead of the nuclear-ER. How these connections are affected by neurodegenerative disease is less explored. As there are many different cell stressors present in neurodegenerative disease, the lack of a unifying approach to explain its pathogenesis emphasizes a need for future research that addresses the effects of simultaneous cell stress pathways on autophagy.
Malignant brain tumors are responsible for the deaths of many pediatric, adolescent, and adult populations around the world. It is estimated that 87,053 deaths were attributed to malignant brain tumors between 2017 and 2021, with brain cancer being the most common cause of cancer death amongst pediatric populations [1].
