Evidence map›Paper›PMID 33876724›Full record

ArticleeLife2021

The biphasic and age-dependent impact of klotho on hallmarks of aging and skeletal muscle function.

Zachary Clemens, Sruthi Sivakumar, Abish Pius, Amrita Sahu, Sunita Shinde, Hikaru Mamiya, Nathaniel Luketich, Jian Cui, Purushottam Dixit, Joerg D Hoeck and 4 more

Open access · goldAbstract readComparative Study
In one paragraph

Article in eLife, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 40 papers.

0numbers the graph read from it
0cells of the map it votes in
40citing papers in PubMed
5.2field-weighted citation impact, top 3% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

40 citing papers in PubMed, 48 citations in OpenAlex.

  1. Article
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  4. Research progress on blood therapy for anti-aging.Journal of advanced research · 2026
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  11. A novel information-theoretic approach reveals loss of effective biomolecular communication in aging muscle cells.The journals of gerontology. Series A, Biological sciences and medical sciences · 2025
    Article
  12. Article
  13. GDF11-secreting cell transplant efficiently ameliorates age-related pulmonary fibrosis.Molecular therapy : the journal of the American Society of Gene Therapy · 2025
    Article
  14. Article
  15. Article
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  17. Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

14 authors at 3 institutions in 2 countries.

Zachary Clemens *Department of Physical Medicine & Rehabilitation, University of Pittsburgh, Pittsburgh, United States.ORCID 0000-0002-2230-9151
Sruthi Sivakumar *Department of Physical Medicine & Rehabilitation, University of Pittsburgh, Pittsburgh, United States.ORCID 0000-0003-0649-8551
Abish Pius *Department of Physical Medicine & Rehabilitation, University of Pittsburgh, Pittsburgh, United States.
Amrita SahuDepartment of Physical Medicine & Rehabilitation, University of Pittsburgh, Pittsburgh, United States.
Sunita ShindeDepartment of Physical Medicine & Rehabilitation, University of Pittsburgh, Pittsburgh, United States.
Hikaru MamiyaDepartment of Bioengineering, University of Pittsburgh, Pittsburgh, United States.
Nathaniel LuketichDepartment of Bioengineering, University of Pittsburgh, Pittsburgh, United States.
Jian CuiDepartment of Computational & Systems Biology, School of Medicine, University of Pittsburgh, Pittsburgh, United States.
Purushottam DixitDepartment of Physics, University of Florida, Gainesville, United States.
Joerg D HoeckDepartment of Research Beyond Borders, Regenerative Medicine, Boehringer Ingelheim Pharmaceuticals, Inc, Rhein, Germany.
Sebastian KreuzDepartment of Research Beyond Borders, Regenerative Medicine, Boehringer Ingelheim Pharmaceuticals, Inc, Rhein, Germany.
Michael FrantiDepartment of Research Beyond Borders, Regenerative Medicine, Boehringer Ingelheim Pharmaceuticals, Inc, Rhein, Germany.
Aaron BarchowskyDepartment of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, United States.ORCID 0000-0003-1268-8159
Fabrisia AmbrosioDepartment of Physical Medicine & Rehabilitation, University of Pittsburgh, Pittsburgh, United States.ORCID 0000-0002-5497-5968
University of Pittsburgh · USBoehringer Ingelheim (Germany) · DEUniversity of Florida · US

Funding

Role of extracellular matrix in age-related declines of muscle regenerationR01AG061005 · NIA · UNIVERSITY OF PITTSBURGH AT PITTSBURGH · PI AMBROSIO, FABRISIA, LEDUC, PHILIP R · 2019 to 2023
$2.5M
The Anti-Aging Role of Klotho in Skeletal Muscle RegenerationR01AG052978 · NIA · UNIVERSITY OF PITTSBURGH AT PITTSBURGH · PI AMBROSIO, FABRISIA · 2017 to 2020
$2.0M
NIA NIH HHS R01 AG052978NIA NIH HHS R01 AG061005
6 · The paper itself

Abstract

Aging is accompanied by disrupted information flow, resulting from accumulation of molecular mistakes. These mistakes ultimately give rise to debilitating disorders including skeletal muscle wasting, or sarcopenia. To derive a global metric of growing 'disorderliness' of aging muscle, we employed a statistical physics approach to estimate the state parameter, entropy, as a function of genes associated with hallmarks of aging. Escalating network entropy reached an inflection point at old age, while structural and functional alterations progressed into oldest-old age. To probe the potential for restoration of molecular 'order' and reversal of the sarcopenic phenotype, we systemically overexpressed the longevity protein, Klotho, via AAV. Klotho overexpression modulated genes representing all hallmarks of aging in old and oldest-old mice, but pathway enrichment revealed directions of changes were, for many genes, age-dependent. Functional improvements were also age-dependent. Klotho improved strength in old mice, but failed to induce benefits beyond the entropic tipping point.

Indexed as

Age FactorsAgingAnimalsDependovirusFemaleGene Expression RegulationGenetic TherapyGenetic VectorsGlucuronidaseHEK293 CellsHumansKlotho ProteinsMaleMiceMice, Inbred C57BLMuscle, SkeletalGlucuronidaseKlotho Proteinsadeno-associated viruscomputational biologyhallmarks of agingklothomousemuscle stem cellsregenerative medicinesarcopeniaskeletal musclestem cellssystems biology

Identifiers

PMID33876724
PMCPMC8118657
OpenAlexW3156499396

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.