Stem Cell Channel (Audio)

Stem cell health in space matters for astronaut health and cancer research. Jessica Pham, UC San Diego, explains how spaceflight shapes normal hematopoietic stem cells and cancer stem cells through nano bioreactor studies, astronaut blood analysis, and tumor organoid work in low-Earth orbit. Pham examines increased cycling and reduced dormancy in space, reduced self-renewal after return, and ongoing research on cancer stem cells and their microenvironment, helping clarify how stem cells respond to spaceflight. This work helps explain how space conditions may change stem cell fitness over time and points toward a better understanding of astronaut health, long-duration missions, and cancer stem cell behavior. Series: "Stem Cell Channel" [Health and Medicine] [Science] [Show ID: 41477]

Brain aging and neurological disease are hard to study because living human brain tissue is difficult to access. Alysson Muotri, Ph.D., UC San Diego, explains how brain organoids sent to space can model accelerated aging, reveal changes in neural networks, and help test potential treatments for brain disorders. Muotri examines space-induced senescence, fragmented network activity linked to dementia and Alzheimer’s patterns, and Rett syndrome findings showing inflammation tied to endogenous retroviruses and response to antiretroviral drugs in preclinical models. He also explores using brain organoids in space to screen neuroprotective compounds, including candidates identified from Amazon plants. This work helps explain how space biology can speed research on autism, Rett syndrome, Alzheimer’s disease, and other neurological conditions, and points toward new ways to test therapies on Earth. Series: "Stem Cell Channel" [Health and Medicine] [Science] [Show ID: 41475]

Organs renew and repair themselves through stem cell systems that respond to injury, microbes, and local signals. Ophir Klein, M.D., Ph.D., of Cedars-Sinai Medical Center explains how the intestine shifts into regenerative states after injury, how long-term changes in the stem cell niche may shape later responses, and how different regions of the colon take on distinct identities. Klein also examines how bacteria help control regional gene expression in the colon, why the lining of the mouth heals faster than skin, and how oral wound healing depends on signaling between epithelial and mesenchymal cells. The program also looks at bioengineering approaches designed to control developmental signals more precisely. Together, these examples show how tissues adapt, heal, and organize themselves, pointing toward better ways to understand regeneration and improve tissue repair. Series: "Stem Cell Channel" [Health and Medicine] [Science] [Show ID: 40849]

Cognitive resilience depends on how the brain responds to environment, aging, and inflammation. J. Tiago Gonçalves, Ph.D., studies the hippocampus to examine how spatial memory is shaped by factors such as cognitive enrichment, exercise, social interaction, disease, and age. Gonçalves explains how adult neurogenesis and microglia help support the brain’s ability to encode information, and how disruptions in these systems can affect memory. He also shows that aging and systemic inflammation can weaken spatial encoding while still revealing signs of adaptation and recovery over time. By connecting brain plasticity, immune activity, and memory formation, Gonçalves presents a broader view of how cognition changes across the lifespan and how these mechanisms may inform future strategies for addressing cognitive decline Series: "Stem Cell Channel" [Health and Medicine] [Science] [Show ID: 40848]

Alpha Clinics in California accelerate the development of regenerative medicine therapies that use cells and genes to treat serious diseases. Patient advocate Tara Radcliffe Ghiglieri shares lived experience with gene therapy, while Sheldon Morris, M.D., M.P.H., Mehrdad Abedi, M.D., Daniela A. Bota, M.D., Ph.D., Catriona Jamieson, M.D., Ph.D., Michael Lewis, M.D., Mark Walters, M.D., and Leo D. Wang, M.D., Ph.D., describe how Alpha Clinic teams design and deliver clinical trials for a wide range of conditions, including cancer, blood disorders, neurologic disease, osteoarthritis, metabolic disorders, pulmonary arterial hypertension, and Duchenne muscular dystrophy. They highlight how coordinated networks, community partnerships, and genomic tools help expand access, lower financial barriers, and bring promising cell and gene therapies to more patients while carefully tracking safety, effectiveness, and long-term outcomes. Series: "Stem Cell Channel" [Health and Medicine] [Show ID: 41168]

Off-the-shelf immune cell therapies using engineered T cells represent an important direction in cancer treatment. Lili Yang, Ph.D., at UCLA develops an off-the-shelf platform based on invariant natural killer T (iNKT) cells generated from hematopoietic stem cells, often sourced from cord blood. Yang programs these stem cells with iNKT cell receptors, chimeric antigen receptors (CARs), and genes such as IL-15 to create pure, expandable iNKT products that recognize lipid antigens presented by non polymorphic CD1d molecules. These cells combine multiple killing mechanisms, infiltrate tissues, target tumor cells and immunosuppressive myeloid cells, and show reduced risk of graft versus host disease and cytokine release syndrome in preclinical models. Yang’s group tests this strategy in models of blood cancers and solid tumors, aiming to generate many therapeutic doses from a single donor. Series: "Stem Cell Channel" [Health and Medicine] [Show ID: 40846]

RNA binding proteins help cells control how genetic information becomes working proteins, and Gene Yeo, Ph.D., M.B.A., at UC San Diego investigates how their disruption contributes to neurodegenerative disease. Yeo focuses on ALS, a severe motor neuron disease in which the RNA binding protein TDP-43 moves from the nucleus to the cytoplasm, loses normal RNA processing functions, and triggers cryptic exons that damage key neuronal genes, including one linked to motor neuropathy. His group maps these RNA changes and develops small nuclear RNA guides packaged in AAV vectors to block harmful splice sites and restore healthy RNA and protein levels. In cell cultures and a humanized mouse model, this strategy improves axon growth and supports the idea that multiplexed RNA-targeted therapies could correct multiple disease pathways at once. Series: "Stem Cell Channel" [Health and Medicine] [Show ID: 41166]

Aging is the leading risk factor for cancer, Alzheimer’s, diabetes, and heart disease, and Robert A.J. Signer, Ph.D., studies how aging stem cells shape pre-cancer and healthspan. As deputy director of the Sanford Stem Cell Discovery Center, Signer focuses on rare blood-forming stem cells that self-renew, generate all blood and immune cells, and normally sustain more than 35 trillion blood cells, including about 2 million new red blood cells every second. His group finds that these “Zen” stem cells slow protein production to limit damaging “trash,” but aging stresses overwhelm these defenses. Stress response programs such as HSF1 then help both healthy and mutant stem cells, fueling clonal hematopoiesis, a common, untreated pre-cancerous condition linked to cardiovascular disease, inflammation, cancer, and increased mortality. Series: "Stem Cell Channel" [Health and Medicine] [Show ID: 41253]

Stem cell science is reshaping treatment for complex disorders of the brain and spinal cord. Researchers develop cell based therapies to replace lost dopaminergic neurons in Parkinson’s disease, fill gaps across spinal cord injuries, and calm seizure networks in refractory epilepsy by restoring the balance of inhibition and excitation. Teams test immune cell therapies against Epstein Barr virus infected B cells in multiple sclerosis and collaborate to move treatments across the blood brain barrier to reach diseased cells. Clinicians combine imaging in the operating room, surgical tools, and research on biological age and the pace of aging to understand disease and guide treatment. Patient advocates describe challenges and hopes for better options, and contemporary art reflects on perception in digital and physical worlds. Series: "Stem Cell Channel" [Health and Medicine] [Science] [Show ID: 40992]

Alejandro Sánchez Alvarado, Ph.D., argues that real progress in understanding regeneration comes from studying whole organisms rather than cells grown under artificial conditions. Sánchez Alvarado shows how observations from intact animals reveal organizing rules that narrow laboratory systems can miss. He presents evidence that stem cells in a studied animal lack detectable junctions with neighboring cells and instead respond to signals that travel across tissues. Sánchez Alvarado links this communication to extracellular vesicles that carry RNA and to metabolic support involving creatine, highlighting how distant tissues influence repair. Using imaging and molecular analyses, he tracks how signals move through the body and how specific cell populations change state during recovery. Sánchez Alvarado concludes that broad, comparative research is essential for uncovering general principles that govern how adult tissues restore form and function. Series: "Stem Cell Channel" [Health and Medicine] [Science] [Show ID: 40454]