aging tagged posts

Nutrients Direct Intestinal Stem Cell Function and Affect Aging

The capacity of intestinal stem cells to maintain cellular balance in the gut decreases upon ageing. Researchers at the University of Helsinki have discovered a new mechanism of action between the nutrient adaptation of intestinal stem cells and ageing. The finding may make a difference when seeking ways to maintain the functional capacity of the ageing gut.

The cellular balance of the intestine is carefully regulated, and it is influenced, among other things, by nutrition: ample nutrition increases the total number of cells in the gut, whereas fasting decreases their number.

The relative number of different types of cells also changes according to nutrient status.

The questions of how the nutrition status of the gut controls stem cell division and differentiation, and how th...

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The Key to Increased Lifespan? Rubicon Alters Autophagy in Animals during Aging


Age-dependent increase in expression of Rubicon, a negative regulator of autophagy, is a cause of age-dependent autophagic impairment and contributes to acceleration of aging in animals. Credit:
Osaka University

Autophagy is an important biological recycling mechanism that is used to maintain homeostasis (balance or equilibrium) within all types of animal tissue. Many studies have attempted to understand the relationship between the reduction of autophagy and progression of aging in animals; however, none have provided a clear explanation, until now.

In 2009, a research team led by Tamotsu Yoshimori at Osaka University identified Rubicon as a protein factor that suppresses autophagy by controlling a specific step in this pathway...

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New Molecules Reverse Memory Loss linked to Depression, Aging

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Novel Benzodiazepine-Like Ligands with Various Anxiolytic, Antidepressant, or Pro-Cognitive ProfilesMolecular Neuropsychiatry, 2019; 1 DOI: 10.1159/000496086

New therapeutic molecules developed at Toronto’s Centre for Addiction and Mental Health (CAMH) show promise in reversing the memory loss linked to depression and aging.
These molecules not only rapidly improve symptoms, but remarkably, also appear to renew the underlying brain impairments causing memory loss in preclinical models.

“Currently there are no medications to treat cognitive symptoms such as memory loss that occur in depression, other mental illnesses and aging,” says Dr. Etienne Sibille, Deputy Director of the Campbell Family Mental Health Research Institute at CAMH and lead scientist on the study.

What’s unique and p...

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The Na/K-ATPase Oxidant Amplification Loop Regulates Aging

Effects of pNaKtide on adipocyte phenotype, senescence, and apoptosis in C57Bl6 aging mice. (A) H&E staining in visceral adipose tissue. Images taken with 40X objective lens; scale bar represents 100 µm. Arrows mark “crown like structures” indicative of inflammation. (B) Quantitative analysis of adipocytes area in visceral adipose tissue. (C) Representative images of TUNEL assay with quantification in C57B16 aging mice. Images taken with 40X objective lens; scale bar represents 25 µm. (D–F) qRT-PCR analysis of ApoJ, p21 and PPARγ in C57Bl6 aging mice with GAPDH as a loading control. Y, young; Y + P, young + pNaKtide; OB, old baseline; O, old; O + P, old + pNaKtide; O + WD, old + western diet; O + WD + P, old + western diet + pNaKtide. N = 8/group, *p < 0.05, **p < 0.01 vs Y, #p < 0.05, ##p < 0.01 vs O, &p < 0.05, &&p < 0.01 vs O + WD.

Effects of pNaKtide on adipocyte phenotype, senescence, and apoptosis in C57Bl6 aging mice. (A) H&E staining in visceral adipose tissue. Images taken with 40X objective lens; scale bar represents 100 µm. Arrows mark “crown like structures” indicative of inflammation. (B) Quantitative analysis of adipocytes area in visceral adipose tissue. (C) Representative images of TUNEL assay with quantification in C57B16 aging mice. Images taken with 40X objective lens; scale bar represents 25 µm. (D–F) qRT-PCR analysis of ApoJ, p21 and PPARγ in C57Bl6 aging mice with GAPDH as a loading control. Y, young; Y + P, young + pNaKtide; OB, old baseline; O, old; O + P, old + pNaKtide; O + WD, old + western diet; O + WD + P, old + western diet + pNaKtide. N = 8/group, *p < 0.05, **p < 0...

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