Recent studies have successfully mapped the CSF drainage pathways outside the skull. Now that we have identified the complete routes, we can experimentally investigate how impaired CSF drainage affects brain cell function.
Certain diseases—including Alzheimer's disease—are known to reduce CSF drainage. However, critical questions remain unanswered: How does impaired CSF drainage affect brain cell function? What role does it play in disease progression?
Addressing these questions will significantly advance our understanding of the pathophysiology underlying neurodegenerative diseases.
CSF is drained through meningeal lymphatic vessels into lymph nodes. It has been revealed that these lymphatic vessels actively pump CSF through contraction and relaxation, indicating they are not simply passive drainage channels. However, the mechanisms regulating this active pumping remain poorly understood. Investigating how the autonomic nervous system and hormones control lymphatic vessel drainage function will provide a fundamental basis for understanding CSF drainage regulation.
Studies have shown that CSF composition can change in response to various physiological stimuli—including stress from sleep deprivation—as well as drugs. Furthermore, additional research is needed on how aging, and diseases alter CSF composition. Through systematic analysis of CSF composition, we aim to identify key factors that reveal how environmental or pathological stimuli impact the brain.
Research on the lymphatic vessels that transport CSF and their surrounding tissues remains in its early stages. Studies using lymphatic vessels and surrounding tissues from CSF drainage pathways in rodents and humans will provide a foundation for non-invasively detecting changes in the central nervous system.