Mitochondria in the brain are dysfunctional early in the Alzheimer's disease, reveals study published in the journal PLoS ONE.
The group looked at mitochondria in three mouse models, each using a different gene shown to cause familial, or early-onset, Alzheimer's disease. The specific mitochondria changes corresponded with the mutation type and included altered mitochondrial movement, structure, and energy dynamics. The changes happened in the brain even before the mice showed any symptoms such as memory loss. The group also found that the mitochondrial changes contributed to the later loss of mitochondrial function and the onset and progression of Alzheimer's disease.
Alzheimers Disease
Alzheimer''s disease is a progressive neurodegenerative disease affecting memory and thinking and making the person increasingly dependent on others.
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"One of the most significant findings of this study is our discovery of the impact of mitochondrial dysfunction in Alzheimer's disease," says Eugenia Trushina, Ph.D., Mayo Clinic pharmacologist and senior investigator on the study. "We are asking: Can we connect the degree of mitochondrial dysfunction with the progression of symptoms in Alzheimer's disease?"
Enlisting the expertise of Mayo researcher Petras Dzeja, Ph.D., the team applied a relatively new method called metabolomics, which measures the chemical fingerprints of metabolic pathways in the cell — sugars, lipids, nucleotides, amino acids and fatty acids, for example. It assesses what is happening in the body at a given time and at a fine level of detail, giving scientists insight into the cellular processes that underlie a disease. In this case, the metabolomic profiles showed changes in metabolites related to mitochondrial function and energy metabolism, further confirming that altered mitochondrial energetics is at the root of the disease process.
![Quiz On Alzheimer’s Disease]( "Quiz On Alzheimer’s Disease")
Alzheimer's disease (AD) is the most common form of dementia. Participate in this quiz to find out how much you know about this debilitating disease.
The researchers hope that the panel of metabolomic biomarkers they discovered can eventually be used for early diagnosis, treatment, and monitoring of Alzheimer's progression.
"We expect to validate metabolomic changes in humans with Alzheimer's disease and to use these biomarkers to diagnose the disease before symptoms appear -- which is the ideal time to start treatment," Dr. Trushina says.
The team looked at neurons of three different genetic animal models of Alzheimer's disease. Researchers applied a mitochondria-specific dye and observed their motion along axons, a process called axonal trafficking. They showed that even in embryonic neurons afflicted with Alzheimer's disease, well before the mice show any memory loss, mitochondrial axonal trafficking is inhibited. Using a panel of techniques that included electron and light microscopy, they determined that in the brains of mice with Alzheimer's disease, mitochondria tended to lose their integrity, ultimately leading to the loss of function. Importantly, dysfunctional mitochondria were detected at the synapses of neurons involved in maintaining memory.
"We are not looking at the consequences of Alzheimer's disease, but at very early events and molecular mechanisms that lead to the disease," Dr. Trushina says. The next step is looking at the same mitochondrial biomarkers in humans, she says. As the researchers begin to understand more about the mitochondrial dynamics that are altered in Alzheimer's disease, they hope to move on to designing drugs that can restore the abnormal bioenergetics and mitochondrial dynamics to treat the disease.
Source: Eurekalert
Quiz On Alzheimer’s Disease
Alzheimer's disease (AD) is the most common form of dementia. Participate in this quiz to find out how much you know about this debilitating disease.
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The researchers hope that the panel of metabolomic biomarkers they discovered can eventually be used for early diagnosis, treatment, and monitoring of Alzheimer's progression.
"We expect to validate metabolomic changes in humans with Alzheimer's disease and to use these biomarkers to diagnose the disease before symptoms appear -- which is the ideal time to start treatment," Dr. Trushina says.
The team looked at neurons of three different genetic animal models of Alzheimer's disease. Researchers applied a mitochondria-specific dye and observed their motion along axons, a process called axonal trafficking. They showed that even in embryonic neurons afflicted with Alzheimer's disease, well before the mice show any memory loss, mitochondrial axonal trafficking is inhibited. Using a panel of techniques that included electron and light microscopy, they determined that in the brains of mice with Alzheimer's disease, mitochondria tended to lose their integrity, ultimately leading to the loss of function. Importantly, dysfunctional mitochondria were detected at the synapses of neurons involved in maintaining memory.
"We are not looking at the consequences of Alzheimer's disease, but at very early events and molecular mechanisms that lead to the disease," Dr. Trushina says. The next step is looking at the same mitochondrial biomarkers in humans, she says. As the researchers begin to understand more about the mitochondrial dynamics that are altered in Alzheimer's disease, they hope to move on to designing drugs that can restore the abnormal bioenergetics and mitochondrial dynamics to treat the disease.
Source: Eurekalert
Caring for Alzheimers disease patients
Alzheimer's disease is a complex brain disorder that triggers the most common form of dementia. The slide show will show how patients need support and care as dementia progresses.
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 Risk Factors for Alzheimers DiseaseCognitively normal adults exhibiting atrophy of their temporal lobe or damage to blood vessels in the brain are more likely to develop Alzheimer's disease. | Advertisement
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