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Aging (Albany NY) (1)
Prostaglandins & other lipid mediators (1)
Xiong, Zheng-Mei (2)
Albanese, Jason L. (1)
Cao, Kan (1)
Driscoll, Meghan K. (1)
Kim, Hee-Yong (1)
Losert, Wolfgang (1)
Mailman, Mitch (1)
Spector, Arthur A. (1)
Year of Publication
A synaptogenic amide N-docosahexaenoylethanolamide promotes hippocampal development
Spector, Arthur A.
Prostaglandins & other lipid mediators
Docosahexaenoic acid (DHA), the n-3 essential fatty acid that is highly enriched in the brain, increases neurite growth and synaptogenesis in cultured mouse fetal hippocampal neurons. These cellular effects may underlie the DHA-induced enhancement of hippocampus-dependent learning and memory functions. We found that N-docsahexaenoylethanolamide (DEA), an ethanolamide derivative of DHA, is a potent mediator for these actions. This is supported by the observation that DHA is converted to DEA by fetal mouse hippocampal neuron cultures and a hippocampal homogenate, and DEA is present endogenously in the mouse hippocampus. Furthermore, DEA stimulates neurite growth and synaptogenesis at substantially lower concentrations than DHA, and it enhances glutamatergic synaptic activities with concomitant increases in synapsin and glutamate receptor subunit expression in the hippocampal neurons. These findings suggest that DEA, an ethanolamide derivative of DHA, is a synaptogenic factor, and therefore we suggest utilizing the term ‘synaptamide’. This brief review summarizes the neuronal production and actions of synaptamide and describes other N-docosahexaenoyl amides that are present in the brain.
N-Docosahexaenoylethanolamide; Synaptamide; DHA; Hippocampus; Neuron; Anandamide; N-Docosahexaenoyl-amino acylamide
Automated image analysis of nuclear shape: What can we learn from a prematurely aged cell?
Driscoll, Meghan K.
Albanese, Jason L.
Aging (Albany NY)
The premature aging disorder, Hutchinson-Gilford progeria syndrome (HGPS), is caused by mutant lamin A, which affects the nuclear scaffolding. The phenotypic hallmark of HGPS is nuclear blebbing. Interestingly, similar nuclear blebbing has also been observed in aged cells from healthy individuals. Recent work has shown that treatment with rapamycin, an inhibitor of the mTOR pathway, reduced nuclear blebbing in HGPS fibroblasts. However, the extent of blebbing varies considerably within each cell population, which makes manual blind counting challenging and subjective. Here, we show a novel, automated and high throughput nuclear shape analysis that quantitatively measures curvature, area, perimeter, eccentricity and additional metrics of nuclear morphology for large populations of cells. We examined HGPS fibroblast cells treated with rapamycin and RAD001 (an analog to rapamycin). Our analysis shows that treatment with RAD001 and rapamycin reduces nuclear blebbing, consistent with blind counting controls. In addition, we find that rapamycin treatment reduces the area of the nucleus, but leaves the eccentricity unchanged. Our nuclear shape analysis provides an unbiased, multidimensional “fingerprint” for a population of cells, which can be used to quantify treatment efficacy and analyze cellular aging.
progeria; aging; rapamycin; mTOR; nucleus
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