{"id":364,"date":"2026-01-07T14:44:00","date_gmt":"2026-01-07T09:14:00","guid":{"rendered":"https:\/\/www.najao.com\/learn\/?p=364"},"modified":"2026-01-25T23:56:01","modified_gmt":"2026-01-25T18:26:01","slug":"blood-brain-barrier","status":"publish","type":"post","link":"https:\/\/www.najao.com\/learn\/blood-brain-barrier\/","title":{"rendered":"The Blood-Brain Barrier: Our Brain&#8217;s Gatekeeper"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The human brain, the most intricate and vital of our organs, requires an exceptionally stable and protected environment to carry out its functions optimally. This reliability is provided by the Blood-Brain Barrier (BBB), a highly specialized and dynamic neurovascular unit that precisely controls the passage of substances from the bloodstream into the brain<strong><sup>1<\/sup><\/strong>. The BBB is much more than a simple wall; it acts as a sophisticated interface between the central nervous system (CNS) and the peripheral circulation. Its primary purpose is to <a href=\"https:\/\/my.clevelandclinic.org\/health\/body\/24931-blood-brain-barrier-bbb\" target=\"_blank\" rel=\"noreferrer noopener\">shield<\/a> the brain from circulating toxins, pathogens, and harmful fluctuations in blood composition, while simultaneously ensuring the selective entry of essential nutrients. While this remarkable selectivity is critical for maintaining brain homeostasis, it also creates a formidable obstacle to the delivery of therapeutic drugs for many neurological disorders<strong><sup>2<\/sup><\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Structure and cellular components of the BBB<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The unique function of the BBB arises from the specialized architecture of the brain&#8217;s microvessels, where multiple cell types work together.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Endothelial cells are the primary barrier<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The insides of brain capillaries are lined by endothelial cells that clearly differ from those seen in other organs<strong><sup>1<\/sup><\/strong>. These cells form very tight junctions\u2014protein complexes known as zonula occludens\u2014that seal the spaces between adjacent cells, and thus restricts the paracellular movement of molecules. Brain capillaries, unlike most peripheral capillaries, lack certain pores called fenestrations and have very few pinocytotic vesicles that limits bulk transport. Their high mitochondrial content reflects the substantial energy required to power selective transport mechanisms.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pericytes support the barrier<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Embedded in the basement membrane and wrapped partially around endothelial cells are certain mural cells, called pericytes<strong><sup>1<\/sup><\/strong>. They are indispensable for the development and function of the BBB because they regulate blood flow, maintain barrier integrity, and stimulate the formation and maintenance of tight junctions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Astrocytes offer metabolic and structural support<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Astrocytes are star-shaped glial cells that project their \u201cend-feet\u201d to almost envelop brain capillaries<strong><sup>1<\/sup><\/strong>. They induce and sustain tight junction formation in endothelial cells, provide metabolic support to neurons and blood vessels, and participate in neurovascular coupling. This neurovascular coupling links neuronal activity to localized blood flow adjustments.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Basement membrane is the structural scaffold<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A basement membrane is a specialized extracellular matrix layer composed of proteins such as collagen, laminin, and fibronectin<strong><sup>2<\/sup><\/strong>. It provides structural support and signaling cues that are essential for maintaining the BBB.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Neurons and microglia offer modulation and immunity<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Neurons do not form part of the physical barrier, however, they do influence BBB properties through the release of signaling molecules<strong><sup>3<\/sup><\/strong>. The resident immune cells of the CNS, called microglia, also contribute to inflammatory responses and BBB regulation, especially during injury or disease<strong><sup>4<\/sup><\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Key functions of the BBB<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The complex structure of the BBB is what allows it to perform several crucial protective and regulatory functions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Physical barrier<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Tight junctions prevent harmful molecules and pathogens in the blood from entering the brain&#8217;s delicate environment<strong><sup>1<\/sup><\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Transport regulation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The BBB selectively permits entry of vital nutrients, like glucose, amino acids, and vitamins, via dedicated transporters while actively exporting metabolic waste and many drugs<strong><sup>5<\/sup><\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Enzymatic barrier<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Endothelial cells enzymatically degrade or modify potentially harmful substances before they can enter the brain tissue<strong><sup>6<\/sup><\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Immune isolation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The BBB restricts entry of peripheral immune cells under normal conditions, thus preventing excessive CNS inflammation<strong><sup>7<\/sup><\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Homeostasis maintenance<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">It regulates ion concentrations, pH, and fluid balance in the brain interstitial fluid, which is essential for optimal neuronal excitability and neurotransmission<strong><sup>1<\/sup><\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Transport mechanisms across the BBB<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The transport of molecules across the BBB occurs chiefly through paracellular transport, transcellular transport, and efflux pumps.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Paracellular transport<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Tight junctions drastically limit movement between endothelial cells, blocking most hydrophilic molecules<strong><sup>1<\/sup><\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Transcellular transport<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Substances must pass through endothelial cells by<strong><sup>1<\/sup><\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Lipid-mediated diffusion<\/strong>&nbsp;of small, lipophilic molecules such as ethanol and caffeine.<\/li>\n\n\n\n<li><strong>Carrier-mediated transport (CMT)<\/strong>&nbsp;of essential hydrophilic molecules like glucose via GLUT1 and amino acids via LAT1<strong><sup>8<\/sup><\/strong>.<\/li>\n\n\n\n<li><strong>Receptor-mediated transcytosis (RMT<\/strong><em>)<\/em>&nbsp;for larger proteins such as transferrin or insulin, which bind endothelial receptors and are transported across in vesicles<strong><sup>8<\/sup><\/strong>.<\/li>\n\n\n\n<li><strong>Adsorptive-mediated transcytosis (AMT)<\/strong>&nbsp;for positively charged molecules binding to endothelial surfaces, enabling their uptake<strong><sup>8<\/sup><\/strong>.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Efflux pumps<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">ATP-driven transporters like P-glycoprotein actively pump many substances out, including therapeutic drugs, back into the bloodstream, thus posing a major obstacle to effective CNS drug delivery<strong><sup>1<\/sup><\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Factors influencing BBB permeability<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">BBB permeability fluctuates with physiological and pathological changes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Physiological influences<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Age affects barrier integrity, with higher permeability in neonates and potential alterations in advanced age<strong><sup>9, 10<\/sup><\/strong>. Circadian rhythms may cause minor daily variations<strong><sup>11<\/sup><\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pathological conditions<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The BBB\u2019s tight junctions can be compromised, leading to a disruption in its function. This can be caused by a wide range of conditions, including inflammation, infections (like meningitis), ischemic stroke, traumatic brain injury, and brain tumors<strong><sup>12, 13<\/sup><\/strong>. It can also be a consequence of chronic diseases such as epilepsy, hypertension, and <a href=\"https:\/\/www.najao.com\/learn\/neurodegeneration\/\" target=\"_blank\" rel=\"noreferrer noopener\">neurodegenerative disorders<\/a>, including <a href=\"https:\/\/www.najao.com\/learn\/alzheimers-disease\/\" target=\"_blank\" rel=\"noreferrer noopener\">Alzheimer\u2019s<\/a>, <a href=\"https:\/\/www.najao.com\/learn\/parkinsons-disease\/\" target=\"_blank\" rel=\"noreferrer noopener\">Parkinson\u2019s<\/a>, and Multiple Sclerosis (MS)<strong><sup>14, 15<\/sup><\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Environmental toxins<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Exposure to heavy metals, pesticides, and air pollutants may damage BBB integrity<strong><sup>16-18<\/sup><\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pharmaceutical manipulation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Certain drugs like mannitol can transiently and non-specifically open the BBB to facilitate drug delivery, though their risks limit clinical use<strong><sup>19<\/sup><\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Role of the BBB in brain health and disease<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The BBB is vital for maintaining a stable environment required for brain function, protecting neurons from harmful substances, regulating waste clearance, and supporting neurodevelopment. A compromised BBB can exacerbate disease by allowing toxic molecules or immune cells into the CNS<strong><sup>20<\/sup><\/strong>. This fuels neuroinflammation as seen in MS, Alzheimer&#8217;s, and Parkinson&#8217;s disease.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Blood-brain barrier disruption is a major contributor to secondary injury after stroke and traumatic brain injury and complicates treatment of brain tumors due to uneven permeability<strong><sup>21, 22<\/sup><\/strong>. Recent studies also suggest a role for subtle BBB dysfunction in psychiatric illness and CNS infection<strong><sup>23<\/sup><\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Challenges imposed by the BBB on CNS drug delivery<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The BBB is the greatest obstacle to effective drug delivery for neurological diseases:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Its tight junctions, lack of fenestrations, limited vesicular transport, and active efflux pumps exclude more than 98% of small molecules and almost all large molecule therapies, and this includes antibodies or gene therapies<strong><sup>1<\/sup><\/strong>.<\/li>\n\n\n\n<li>Many promising drugs fail due to insufficient brain penetration, thus limiting treatment options for disorders like Alzheimer&#8217;s, Parkinson&#8217;s, and brain <a href=\"https:\/\/www.najao.com\/learn\/cancer-carcinogenesis\/\" target=\"_blank\" rel=\"noreferrer noopener\">cancer<\/a><strong><sup>24<\/sup><\/strong>.<\/li>\n\n\n\n<li>Endothelial metabolism may degrade some compounds before crossing<strong><sup>6<\/sup><\/strong>.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Strategies to bypass or modulate the BBB<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">To overcome this barrier, various innovative approaches are adopted.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Invasive\/disruptive techniques<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Osmotic disruption using hypertonic solutions can temporarily open tight junctions but is risky and non-specific<strong><sup>25<\/sup><\/strong>.<\/li>\n\n\n\n<li>Direct <a href=\"https:\/\/www.najao.com\/learn\/drug-delivery\/\" target=\"_blank\" rel=\"noreferrer noopener\">drug delivery<\/a> into cerebrospinal fluid via intrathecal or intracerebroventricular injections circumvents the BBB<strong><sup>26<\/sup><\/strong>. However, it is invasive and poses distribution challenges.<\/li>\n\n\n\n<li>Focused ultrasound combined with microbubbles enables transient, localized, and reversible BBB opening with minimal invasiveness<strong><sup>27<\/sup><\/strong>. It is currently a highly promising clinical technique.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Exploiting endogenous transport pathways<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Designing drugs as lipophilic prodrugs or chemically modifying them to enhance passive diffusion helps cross this barrier<strong><sup>28<\/sup><\/strong>. More sophisticated tactics include hijacking CMT, AMT or RMT systems<strong><sup>8<\/sup><\/strong>. One such approach, known as the &#8220;Trojan horse&#8221; strategy, involves using molecules that mimic natural ligands like transferrin or insulin to ferry drugs across the barrier.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Cell-mediated delivery<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Utilizing immune cells such as macrophages or stem cells naturally cross the BBB to deliver therapeutic agents directly into brain tissue<strong><sup>29<\/sup><\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Nanoparticles mediated delivery<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Encapsulating drugs in liposomes or polymeric <a href=\"https:\/\/www.najao.com\/learn\/nanomedicine\/\" target=\"_blank\" rel=\"noreferrer noopener\">nanoparticles<\/a>, often surface-functionalized with BBB-targeting ligands or coatings, facilitates passage and reduces chances of efflux<strong><sup>30<\/sup><\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Efflux pump modulation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Inhibitors of key transporters, such as P-glycoprotein can improve the retention of drugs in the brain<strong><sup>31<\/sup><\/strong>. However, using them poses considerable challenges due to systemic toxicity.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Future directions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Emerging research directions aim to deepen understanding and improve therapeutic delivery:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Advanced&nbsp;<em>in vitro<\/em> BBB <a href=\"http:\/\/www.najao.com\/learn\/disease-modeling\/\" target=\"_blank\" rel=\"noreferrer noopener\">models<\/a>, including <a href=\"https:\/\/www.najao.com\/learn\/organoids\/\" target=\"_blank\" rel=\"noreferrer noopener\">organoids<\/a>, organ-on-a-chip and stem cell-derived systems, allow more accurate drug screening and mechanistic studies<strong><sup>32, 33<\/sup><\/strong>.<\/li>\n\n\n\n<li><em>In vivo<\/em> imaging&nbsp;modalities enable real-time monitoring of the BBB integrity and drug penetration<strong><sup>34<\/sup><\/strong>.<\/li>\n\n\n\n<li>The development of&nbsp;precise, localized technologies seeks to modulate the BBB<strong><sup>35<\/sup><\/strong>. The goal is a reversible and targeted opening that minimizes systemic side effects.<\/li>\n\n\n\n<li><a href=\"https:\/\/www.najao.com\/learn\/artificial-intelligence-applications-in-healthcare\/\" target=\"_blank\" rel=\"noreferrer noopener\">Artificial intelligence<\/a> and machine learning help to predict BBB permeability and facilitate rational design of novel carriers or peptides that penetrate the BBB efficiently<strong><sup>36<\/sup><\/strong>.<\/li>\n\n\n\n<li>Growing appreciation of&nbsp;regional BBB heterogeneity&nbsp;supports the development of site-specific therapies<strong><sup>37<\/sup><\/strong>.<\/li>\n\n\n\n<li>Researchers are focusing on therapies that restore BBB integrity in diseases where the barrier has broken down. Restoring the BBB is key to limiting neuroinflammation and disease progression.<\/li>\n\n\n\n<li>Gene therapy vectors&nbsp;capable of crossing the BBB promise future treatment of genetic CNS disorders with targeted delivery<strong><sup>38<\/sup><\/strong>.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The Blood-Brain Barrier essentially serves as our brain\u2019s very own shield, which protects its unique microenvironment from harmful substances while regulating the entry of vital nutrients. Yet, this same barrier poses the most formidable hurdle in treating neurological disorders by blocking the vast majority of drugs from reaching their targets within the CNS. Overcoming this challenge through deeper knowledge of BBB biology and innovative drug delivery is central to unlocking effective therapies for a broad spectrum of devastating brain diseases, from Alzheimer\u2019s and Parkinson\u2019s to stroke and brain tumors.<\/p>\n\n\n\n<!--nextpage-->\n\n\n\n<h2 class=\"wp-block-heading\">FAQs<\/h2>\n\n\n\n<h4 class=\"wp-block-heading\">1. Is the BBB the same in all parts of the brain?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">No. Different regions of the brain have variations in BBB permeability. For example, areas involved in sensing hormones\u2014such as the hypothalamus\u2014have a slightly leaky BBB to allow communication with the bloodstream. This regional heterogeneity is an area of active research.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">2. Can stress or emotions affect the BBB?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. Stress hormones like cortisol can impact BBB permeability. Chronic stress has been linked to weakening of the barrier, which may contribute to higher risks of mood and neurodegenerative disorders.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">3. If the BBB blocks most drugs, how do common medicines like painkillers or antidepressants work?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Some small and lipophilic drugs, such as certain antidepressants, caffeine, and nicotine, can diffuse across the barrier. Others are carefully designed to use transport systems already present in the BBB. This is why not all drugs are equally effective for brain conditions\u2014many simply can\u2019t get through.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Reference<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">1. Wu, D., Chen, Q., Chen, X., <em>et al<\/em>. (2023). The blood\u2013brain barrier: Structure, regulation and drug delivery.&nbsp;<em>Signal transduction and targeted therapy<\/em>,&nbsp;<em>8<\/em>(1), 217.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2. Xu, L., Nirwane, A., &amp; Yao, Y. (2018). Basement membrane and blood\u2013brain barrier.&nbsp;<em>Stroke and Vascular Neurology<\/em>,&nbsp;<em>4<\/em>(2), 78.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3. Kaplan, L., Chow, B. W., &amp; Gu, C. (2020). Neuronal regulation of the blood\u2013brain barrier and neurovascular coupling.&nbsp;<em>Nature Reviews Neuroscience<\/em>,&nbsp;<em>21<\/em>(8), 416-432.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">4. Ronaldson, P. T., &amp; Davis, T. P. (2020). Regulation of blood\u2013brain barrier integrity by microglia in health and disease: a therapeutic opportunity.&nbsp;<em>Journal of Cerebral Blood Flow &amp; Metabolism<\/em>,&nbsp;<em>40<\/em>(1_suppl), S6-S24.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">5. Campos-Bedolla, P., Walter, F. R., Veszelka, S., <em>et al<\/em>. (2014). Role of the blood\u2013brain barrier in the nutrition of the central nervous system.&nbsp;<em>Archives of medical research<\/em>,&nbsp;<em>45<\/em>(8), 610-638.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">6. Li, J., Zheng, M., Shimoni, O., <em>et al<\/em>. (2021). Development of novel therapeutics targeting the blood\u2013brain barrier: from barrier to carrier.&nbsp;<em>Advanced Science<\/em>,&nbsp;<em>8<\/em>(16), 2101090.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">7. Huang, X., Hussain, B., &amp; Chang, J. (2021). Peripheral inflammation and blood\u2013brain barrier disruption: effects and mechanisms.&nbsp;<em>CNS neuroscience &amp; therapeutics<\/em>,&nbsp;<em>27<\/em>(1), 36-47.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">8. Seo, M. W., &amp; Park, T. E. (2021). Recent advances with liposomes as drug carriers for treatment of neurodegenerative diseases.&nbsp;<em>Biomedical Engineering Letters<\/em>,&nbsp;<em>11<\/em>(3), 211-216.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">9. Erd\u0151, F., Denes, L., &amp; de Lange, E. (2017). Age-associated physiological and pathological changes at the blood\u2013brain barrier: A review.&nbsp;<em>Journal of Cerebral Blood Flow &amp; Metabolism<\/em>,&nbsp;<em>37<\/em>(1), 4-24.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">10. Saunders, N. R., Liddelow, S. A., &amp; Dziegielewska, K. M. (2012). Barrier mechanisms in the developing brain.&nbsp;<em>Frontiers in pharmacology<\/em>,&nbsp;<em>3<\/em>, 46.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">11. Cuddapah, V. A., Zhang, S. L., &amp; Sehgal, A. (2019). Regulation of the blood\u2013brain barrier by circadian rhythms and sleep.&nbsp;<em>Trends in neurosciences<\/em>,&nbsp;<em>42<\/em>(7), 500-510.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">12. Galea, I. (2021). The blood\u2013brain barrier in systemic infection and inflammation.&nbsp;<em>Cellular &amp; molecular immunology<\/em>,&nbsp;<em>18<\/em>(11), 2489-2501.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">13. Sweeney, M. D., Zhao, Z., Montagne, A., <em>et al<\/em>. (2018). Blood-Brain Barrier: From Physiology to Disease and Back.&nbsp;<em>Physiological Reviews<\/em>,&nbsp;<em>99<\/em>(1), 21.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">14. Setiadi, A., Korim, W. S., Elsaafien, K., <em>et al<\/em>. (2018). The role of the blood\u2013brain barrier in hypertension.&nbsp;<em>Experimental physiology<\/em>,&nbsp;<em>103<\/em>(3), 337-342.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">15. Khalid Iqbal, M., Khan, B., Hifsa, <em>et al<\/em>. (2024). The Impact of the Blood\u2013Brain Barrier and Its Dysfunction in Parkinson\u2019s Disease: Contributions to Pathogenesis and Progression.&nbsp;<em>ACS omega<\/em>,&nbsp;<em>9<\/em>(46), 45663-45672.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">16. Zheng, W., Aschner, M., &amp; Ghersi-Egea, J. F. (2003). Brain barrier systems: a new frontier in metal neurotoxicological research.&nbsp;<em>Toxicology and applied pharmacology<\/em>,&nbsp;<em>192<\/em>(1), 1-11.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">17. Abou Diwan, M., Djekkoun, N., Boucau, M. C., <em>et al<\/em>. (2024). Maternal exposure to pesticides induces perturbations in the gut microbiota and blood\u2013brain barrier of dams and the progeny, prevented by a prebiotic.&nbsp;<em>Environmental Science and Pollution Research<\/em>,&nbsp;<em>31<\/em>(49), 58957-58972.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">18. Calder\u00f3n-Garcidue\u00f1as, L., Solt, A. C., Henr\u00edquez-Rold\u00e1n, C., <em>et al<\/em>. (2008). Long-term air pollution exposure is associated with neuroinflammation, an altered innate immune response, disruption of the blood-brain barrier, ultrafine particulate deposition, and accumulation of amyloid \u03b2-42 and \u03b1-synuclein in children and young adults.&nbsp;<em>Toxicologic pathology<\/em>,&nbsp;<em>36<\/em>(2), 289-310.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">19. Joshi, S., Ergin, A., Wang, M., <em>et al<\/em>. (2011). Inconsistent blood brain barrier disruption by intraarterial mannitol in rabbits: implications for chemotherapy.&nbsp;<em>Journal of neuro-oncology<\/em>,&nbsp;<em>104<\/em>(1), 11-19.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">20. Archie, S. R., Al Shoyaib, A., &amp; Cucullo, L. (2021). Blood-brain barrier dysfunction in CNS disorders and putative therapeutic targets: an overview.&nbsp;<em>Pharmaceutics<\/em>,&nbsp;<em>13<\/em>(11), 1779.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">21. Shlosberg, D., Benifla, M., Kaufer, D., <em>et al<\/em>. (2010). Blood\u2013brain barrier breakdown as a therapeutic target in traumatic brain injury.&nbsp;<em>Nature Reviews Neurology<\/em>,&nbsp;<em>6<\/em>(7), 393-403.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">22. Fortin, D. (2012). The blood-brain barrier: its influence in the treatment of brain tumors metastases.&nbsp;<em>Current cancer drug targets<\/em>,&nbsp;<em>12<\/em>(3), 247-259.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">23. Pollak, T. A., Drndarski, S., Stone, J. M., <em>et al<\/em>. (2018). The blood\u2013brain barrier in psychosis.&nbsp;<em>The Lancet Psychiatry<\/em>,&nbsp;<em>5<\/em>(1), 79-92.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">24. Yiannopoulou, K. G., Anastasiou, A. I., Zachariou, V., <em>et al<\/em>. (2019). Reasons for Failed Trials of Disease-Modifying Treatments for Alzheimer Disease and Their Contribution in Recent Research.&nbsp;<em>Biomedicines<\/em>,&nbsp;<em>7<\/em>(4), 97.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">25. Bellavance, M. A., Blanchette, M., &amp; Fortin, D. (2008). Recent advances in blood\u2013brain barrier disruption as a CNS delivery strategy.&nbsp;<em>The AAPS journal<\/em>,&nbsp;<em>10<\/em>(1), 166-177.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">26. Nau, R., S\u00f6rgel, F., &amp; Eiffert, H. (2010). Penetration of drugs through the blood-cerebrospinal fluid\/blood-brain barrier for treatment of central nervous system infections.&nbsp;<em>Clinical microbiology reviews<\/em>,&nbsp;<em>23<\/em>(4), 858-883.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">27. He, C., Wu, Z., Zhuang, M., <em>et al<\/em>. (2023). Focused ultrasound-mediated blood-brain barrier opening combined with magnetic targeting cytomembrane based biomimetic microbubbles for glioblastoma therapy.&nbsp;<em>Journal of Nanobiotechnology<\/em>,&nbsp;<em>21<\/em>(1), 297.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">28. Li, Y., Zhou, Y., Jiang, J., <em>et al<\/em>. (2015). Mechanism of brain targeting by dexibuprofen prodrugs modified with ethanolamine-related structures.&nbsp;<em>Journal of Cerebral Blood Flow &amp; Metabolism<\/em>,&nbsp;<em>35<\/em>(12), 1985-1994.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">29. Wagh, S. S., Famta, P., Shah, S., <em>et al<\/em>. (2025). Navigating the brain: Harnessing endogenous cellular hitchhiking for targeting neoplastic and neuroinflammatory diseases.&nbsp;<em>Asian Journal of Pharmaceutical Sciences<\/em>, <em>20<\/em>(2), 101040.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">30. Zhang, W., Mehta, A., Tong, Z., <em>et al<\/em>. (2021). Development of polymeric nanoparticles for blood\u2013brain barrier transfer\u2014strategies and challenges.&nbsp;<em>Advanced Science<\/em>,&nbsp;<em>8<\/em>(10), 2003937.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">31. Miller, D. S., Bauer, B., &amp; Hartz, A. M. (2008). Modulation of P-glycoprotein at the blood-brain barrier: opportunities to improve central nervous system pharmacotherapy.&nbsp;<em>Pharmacological reviews<\/em>,&nbsp;<em>60<\/em>(2), 196-209.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">32. Kawakita, S., Mandal, K., Mou, L., <em>et al<\/em>. (2022). Organ-on-a-Chip Models of the Blood-Brain Barrier: Recent Advances and Future Prospects.&nbsp;<em>Small (Weinheim an der Bergstrasse, Germany)<\/em>,&nbsp;<em>18<\/em>(39), e2201401.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">33. Stebbins, M. J., Gastfriend, B. D., Canfield, S. G., <em>et al<\/em>. (2019). Human pluripotent stem cell\u2013derived brain pericyte\u2013like cells induce blood-brain barrier properties.&nbsp;<em>Science advances<\/em>,&nbsp;<em>5<\/em>(3), eaau7375.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">34. Prager, O., Chassidim, Y., Klein, C., <em>et al<\/em>. (2010). Dynamic in vivo imaging of cerebral blood flow and blood\u2013brain barrier permeability.&nbsp;<em>Neuroimage<\/em>,&nbsp;<em>49<\/em>(1), 337-344.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">35. Liu, S., Jin, X., Ge, Y., <em>et al<\/em>. (2025). Advances in brain-targeted delivery strategies and natural product-mediated enhancement of blood\u2013brain barrier permeability.&nbsp;<em>Journal of Nanobiotechnology<\/em>,&nbsp;<em>23<\/em>(1), 382.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">36. Singh, A. V., Chandrasekar, V., Janapareddy, P., <em>et al<\/em>. (2021). Emerging application of nanorobotics and artificial intelligence to cross the BBB: advances in design, controlled maneuvering, and targeting of the barriers.&nbsp;<em>ACS chemical neuroscience<\/em>,&nbsp;<em>12<\/em>(11), 1835-1853.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">37. Helfield, B., Zou, Y., &amp; Matsuura, N. (2021). Acoustically-stimulated nanobubbles: opportunities in medical ultrasound imaging and therapy.&nbsp;<em>Frontiers in Physics<\/em>,&nbsp;<em>9<\/em>, 654374.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">38. Stanimirovic, D. B., Sandhu, J. K., &amp; Costain, W. J. (2018). Emerging technologies for delivery of biotherapeutics and gene therapy across the blood\u2013brain barrier.&nbsp;<em>BioDrugs<\/em>,&nbsp;<em>32<\/em>(6), 547.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The blood-brain barrier is a vital defense system that regulates what enters the brain, protecting it from toxins and pathogens while allowing only the essential nutrients to pass through. 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