Transgenic Mice Have Proven Successful in Combating Neurogenerative Diseases

Аннотация

A study investigating the role of cathepsin D (CTSD) in neuroprotection has provided compelling evidence of its critical importance in preventing neurodegenerative processes. The central idea of the work is that overexpression of CTSD can compensate for the deficiency of this enzyme caused by genetic knockout, thereby preventing the development of lethal consequences and the accumulation of amyloid plaques characteristic of neurodegenerative diseases such as Alzheimer's disease. Lysosomes, intracellular organelles, play a key role in the degradation of proteins and other cellular components, thereby ensuring cellular homeostasis. Cathepsins, including CTSD, are the most important lysosomal proteases responsible for the breakdown of various substrates, including toxic protein aggregates. CTSD deficiency in humans leads to the development of neurolipofuscinosis (NCL), a group of severe inherited neurodegenerative diseases characterized by the accumulation of lipofuscin in nerve cells and progressive neuronal damage. This disease demonstrates a direct link between lysosomal protease deficiency and the development of neurodegeneration. Keywords: Transgenic mouse, Cathepsin D, Mitochondrial bioenergetics, Apoptosis, Cathepsin D knockout mice, Dopamine, Autophagy, Lysosome, Life expectancy, Behavior, Neuronal, ceroid, lipofuscinosis. Introduction: Preface of the enzyme. These mice, designated CDtg, Previous studies using a CTSD gene knockout mouse demonstrated normal behavior and sensitivity to model (CtsdKO or CDKO) have confirmed this neurotoxic agents such as MPTP (1-methyl-4-phenyl- association. CDKO mice showed intracellular 1,2,3,6-tetrahydropyridine), indicating that CTSD accumulation of protein aggregates, decreased overexpression does not have significant negative proteasome activity (another critical protein consequences. degradation system), and, importantly, early postnatal lethality at around day 26 of life. These On the experiment that plays a decisive role in the findings highlight the critical role of CTSD in study: The key experiment involved crossing CDtg maintaining cellular health and preventing the mice with CDKO mice. The results were dramatic: accumulation of potentially toxic proteins. overexpression of CTSD in the nervous system of CDKO mice significantly extended their lifespan, To study the protective properties of CTSD, the partially restored the reduced proteasome activity, researchers developed a new transgenic mouse strain and, most importantly, reduced the accumulation of that overexpressed human CTSD specifically in cells of Aβ42, an amyloid peptide that plays a key role in the the nervous system. This was achieved by using the development of Alzheimer's disease. Thus, the Cre-loxP recombination system, which allowed CTSD experimental data confirm the protective role of gene expression to be activated only in cells CTSD against proteotoxicity and the accumulation of expressing the Nestin protein, a marker of neural toxic protein aggregates. Importantly, overexpression stem cells and neurons. Thus, CTSD was of other cathepsins (B and L) did not show a similar overexpressed selectively in neural tissue, eliminating effect, confirming the specificity of the role of CTSD. the potential side effects of systemic overproduction American Journal of Applied Science and Technology 92 https://theusajournals.com/index.php/ajast American Journal of Applied Science and Technology (ISSN: 2771-2745) In conclusion, the study demonstrated the potential METHODS of CTSD enhancement strategy as a therapeutic Mice: To study the role of CTSD in neurodegenerative approach to combat neurodegenerative diseases. The processes, genetically modified Ctsd knockout (CDKO) developed transgenic mouse line represents a mice are used. These mice, lacking a functional CTSD valuable model for further research in this area, gene, display severe pathological changes. They allowing to study the mechanisms of CTSD-mediated exhibit neuronal, inflammatory and systemic neuroprotection and to develop new treatment abnormalities and, most importantly, have a strategies. Moreover, the results of the study confirm significantly reduced lifespan, dying at approximately the importance of maintaining lysosomal 26 days of age due to intestinal necrosis. This homeostasis to prevent neurodegenerative processes confirms the vital role of CTSD in maintaining the and open new avenues for the development of body's homeostasis. A more detailed study of CDKO therapeutic strategies aimed at enhancing lysosomal mice showed the accumulation of autophagosomes , protein degradation in the nervous system. This is of structures involved in autophagy, as well as α- great importance for the search for effective drugs to synuclein. This clearly demonstrates that the absence combat Alzheimer's disease and other of CTSD disrupts the autophago-lysosomal pathway, neurodegenerative diseases for which there is leading to the accumulation of proteins that