Alzheimer's Disease and its Related Dementia Types: A Review on Their Management Nanotechnology Based Therapeutic Strategies.

Background: Dementia and its related types such as Alzheimer's disease, vascular dementia and mixed dementia belong to brain associated diseases, resulting in long-term progressive memory loss. These diseases are so severe that can affect a person's daily routine. Up to date, treatment of dementia is still an unmet challenge due to their complex pathophysiology and unavailable efficient pharmacological approaches. The use of nanotechnology based pharmaceutical products could possibly improve the management of dementia given that nanocarriers could more efficiently deliver drugs to the brain.

Objective: The objective of this study is to provide the current nanotechnology based drug delivery systems for the treatment of various dementia types. In addition, the current diagnosis biomarkers for the mentioned dementia types along with their available pharmacological treatment are being discussed.

Methods: An extensive review of the current nanosystems such as brain drug delivery systems against Alzheimer's disease, vascular dementia and mixed dementia was performed. Moreover, nanotheranostics as possible imaging markers for such dementias were also reported.

Results: The field of nanotechnology is quite advantageous for targeting dementia given that nanoscale drug delivery systems easily penetrate the blood brain barrier and circulate in the body for prolonged time. These nanoformulations consist of polymeric nanoparticles, solid lipid nanoparticles, nanostructured lipid carriers, microemulsions, nanoemulsions, and liquid crystals. The delivery of the nanotherapeutics can be achieved via various administration routes such as transdermal, injectable, oral, and more importantly, through the intranasal route. Nonetheless, the nanocarriers are mostly limited to Alzheimer's disease targeting; thus, nanocarriers for other types of dementia should be developed.

Conclusion: To conclude, understanding the mechanism of neurodegeneration and reviewing the current drug delivery systems for Alzheimer's disease and other dementia types are significant for medical and pharmaceutical society to produce efficient therapeutic choices and novel strategies based on multifunctional and biocompatible nanocarriers, which can deliver the drug sufficiently into the brain.