Summary: Researchers shed new light on how DHA, a key essential Omega-3 fatty acid, could help promote cell survival and contribute to treating Alzheimer’s, Parkinson’s disease and stoke.
Understanding how dietary essential fatty acids work may lead to effective treatments for diseases and conditions such as stroke, Alzheimer’s disease, age-related macular degeneration, Parkinson’s disease and other retinal and neurodegenerative diseases. The key is to be able to intervene during the early stages of the disease. That is the conclusion of a Minireview by Nicolas Bazan, MD, PhD, Boyd Professor and Director, and Aram Asatryan, PhD, postdoctoral researcher, at the Neuroscience Center of Excellence at LSU Health New Orleans School of Medicine published in the Journal of Biological Chemistry‘s Thematic Minireview Series: Inflammatory transcription confronts homeostatic disruptions.
Docosahexaenoic acid (DHA), a key essential Omega-3 fatty acid, produces signaling molecules called docosanoids in response to disruptions in the state of equilibrium within cells caused by injury or disease. Neuroprotectin D1 (NDP1) is a docosanoid that the Bazan lab discovered and found protects neurons by controlling which and how certain genes in the retina and brain respond.
Research shows that the preclinical events in Alzheimer’s disease including neuroinflammation, damage to dendritic spines – small doorknob-shaped protrusions that help transmit electrical signals to the cell – and problems with cell-to-cell communication coincide with decreased DHA content in the brain. The neuroprotective bioactivity of NPD1 includes inflammatory modulating properties as well as features that promote cell survival, both of which contribute to restoring a stable state of equilibrium, or homeostasis, within the cell.
In experimental models of stroke, researchers at LSU Health New Orleans Neuroscience Center led by Bazan have shown that the administration of NPD1 reduces the size of stroke damage and also saves tissue in the rim surrounding the stroke core, which remains viable for a short time.
Research has demonstrated that DHA from the liver is also retained and concentrated in photoreceptor cells and that retinal degeneration occurs when photoreceptor cells fail to capture DHA. When a gene that regulates the uptake of DHA is turned off, photoreceptor cells die and a single amino acid mutation in this receptor can cause retinitis pigmentosa.
Cells die through a variety of mechanisms. Contributors include a family of reactive oxygen species – compounds formed continuously as by-products of aerobic metabolism such as from reactions to drugs and environmental toxins, or when the levels of antioxidants are diminished creating oxidative stress, as well as inflammation and the disease process. Cell death is considered to be reversible until a first “point of no return” checkpoint is passed. The authors describe how NPD1 acts to stop cells from passing that checkpoint in cell death activation pathways including apoptosis, necrosis, necroptosis, pyroptosis, and pyronecrosis, among others.
The Minireview summarizes the effects of the essential fatty acid family member DHA and its bioactive derivative NPD1 in the context of a specific target of gene regulation. The authors also describe the mechanism of a pathway of regulation by a bioactive lipid that has a significant impact on cellular homeostasis – how NPD1 activates pro-survival genes and suppresses pro-death genes.
“The organizational and functional complexity of the brain raises new questions regarding how the cellular events described here operate in response to disrupted homeostasis to attain neuroprotection in pathological conditions,” notes Bazan. “It is our hope that this knowledge will contribute to managing early stages of such devastating diseases as Alzheimer’s, stroke, traumatic brain injury, age-related macular degeneration, Parkinson’s and others.”
Funding: The research was supported in whole or in part by National Institutes of Health grants GM103340 from the National Institute of General Medical Sciences, EY005121 from the National Eye Institute, and NS046741 from the National Institute of Neurological Disorders and Stroke, as well as a grant from the Eye, Ear, Nose & Throat Foundation, and in part by an unrestricted departmental grant from Research to Prevent Blindness, Inc., New York.
Source: Leslie Capo – LSU
Image Source: NeuroscienceNews.com image is in the public domain.
Original Research: Abstract for “Molecular mechanisms of signaling via the docosanoid neuroprotectin D1 for cellular homeostasis and neuroprotection” by Aram Asatryan and Nicolas G. Bazan in Journal of Biological Chemistry. Published online June 14 2017 doi:10.1074/jbc.R117.783076
Molecular mechanisms of signaling via the docosanoid neuroprotectin D1 for cellular homeostasis and neuroprotection
Docosahexaenoic acid (DHA), an omega-3 essential fatty acid family member that is enriched in the nervous system, generates bioactive docosanoids that can counteract disruptions of cellular homeostasis. Docosanoids include neuroprotectin D1 (NPD1), which is decreased in the CA1 hippocampal area of patients with early-stage Alzheimers disease (AD). We summarize here how NPD1 elicits neuroprotection by up-regulating c-REL, a nuclear factor (NF)-kappaB subtype that, in turn, enhances expression of BIRC3 (baculoviral IAP repeat-containing protein 3, or cIAP2) in retinal cells. This DHA/NPD1-inducible pathway also is activated in an experimental ischemic stroke model and leads to neurological protection. Further elucidating the mechanisms of action of NPD1 and other docosanoids will contribute to managing diseases, including stroke, AD, age-related macular degeneration, traumatic brain injury, Parkinsons disease, and other neurodegenerative diseases.
“Molecular mechanisms of signaling via the docosanoid neuroprotectin D1 for cellular homeostasis and neuroprotection” by Aram Asatryan and Nicolas G. Bazan in Journal of Biological Chemistry. Published online June 14 2017 doi:10.1074/jbc.R117.783076