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International Journal of Molecular Sciences

Removing a protein reduced lung tumour burden in mice

An animal experiment found that mice lacking the protein PA200 had reduced chemically induced lung tumour burden, especially in middle age.

Paper by Chen-Yang Jiang, Yan-Li Wang, Nan Lv, Bingkun Cai, Tian-Xia Jiang
Figure 1. Elevated PA200 expression in human cancers is correlated with poor patient survival and advanced age.
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Figure 1. Elevated PA200 expression in human cancers is correlated with poor patient survival and advanced age.Elevated PA200 expression in human cancers is correlated with poor patient survival and advanced age.Jiang et al.
Experiments in animalsMechanisms
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In mice with lung tumours induced by the chemical urethane, researchers tested the effects of removing PA200, a protein that helps cells break down other proteins. This animal experiment found a marked reduction in tumour burden, especially in middle-aged mice. The reduction accompanied partial changes in the inflammation-promoting environment around tumours.

In separate tumour-cell experiments, cells lacking PA200 multiplied and migrated less. They also showed more senescence, a state in which cells stop dividing, in response to oxidative stress, a form of chemical stress. In human lung cancer, higher PA200 levels were associated with poorer prognosis and advancing age.

Why it matters

The work addresses how cellular senescence relates to age-associated cancer. The authors highlighted PA200 as a potential target for lung cancer in older patients.

Caveats

The tumour-burden result came from a chemically induced mouse model, not a treatment study in people. Whether targeting PA200 would benefit older patients remains untested here.

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