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Journal of Nanobiotechnology

Engineered bacterial particles reduced bone loss in older mice

Weekly injections for one month improved bone structure in 18-month-old male mice with age-related bone loss.

Paper by Chengpeng Diao, Zhenqian Sun, Fei Liu, +9 more authorsYunzhen Chen · Shandong University
Figure 1 from Journal of Nanobiotechnology
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Figure 1. Diao et al.

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Interventions
Studied:
Experiments in mice (Randomized)

Editor of record: Boris Djordjevic · AgingResearch.News

Paper
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Eighteen-month-old male C57BL/6 mice with age-related bone loss received weekly injections in an experiment testing engineered bacterial vesicles—tiny sacs released by bacteria. The researchers randomly assigned the older mice to saline, unmodified vesicles or two engineered versions. The vesicle groups received 5 milligrams per kilogram once weekly for one month.

The most extensively engineered vesicles carried two targeting components and an enzyme intended to support bone formation. They reduced bone loss and produced the strongest improvements in bone structure among the tested vesicles. Experiments in bone marrow stem cells grown in the lab suggested that the delivered enzyme supported molecular changes that enhanced sugar breakdown. The authors proposed that this supplied energy to help these stem cells develop into bone-forming cells.

Why it matters

Age-related osteoporosis makes bone formation a potential target for intervention. The authors presented this targeted delivery approach as a preclinical proof of concept.

Caveats

The bone-loss experiment assessed outcomes after one month, leaving the durability of the effects unresolved. It used male mice from one strain, not people with osteoporosis.

Where the evidence stands

Bt

Humans: a single group. Cells, worms or flies and mice: nothing yet.

C, W, M, H: cells, worms or flies, mice, humans. Dark: independent labs found the same change there. Light: one lab or one study. Outline: nothing yet.

Labs are independent when their papers share no last author and no institution.

  • 4 independent labs in 4 countries
  • Funders: National Natural Science Foundation of China and 7 more

Clathrin-mediated endocytosis

Cells: replicated by independent labs. Worms or flies, mice and humans: a single group.

C, W, M, H: cells, worms or flies, mice, humans. Dark: independent labs found the same change there. Light: one lab or one study. Outline: nothing yet.

Labs are independent when their papers share no last author and no institution.

Against: findings that point the other way from most findings on the same outcome.

Company ties: findings with an author at a company, or from a paper whose competing-interests statement declares ties to one.

Includes the processes named after it and trials of drugs aimed at it.

  • 30 independent labs in 10 countries
  • 1 finding against
  • Funders: National Institutes of Health and others
  • 2 of 38 findings with company ties

From the paper

Limitation

The upstream mechanisms underlying SAE1 downregulation in SOP pathogenesis, such as aging-associated oxidative stress or epigenetic alterations, remain to be fully understood.

Discussion

Quoted word for word from the full text on link.springer.com.

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