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Interleukin-6 and cachexia in ApcMin/+ mice.

Kristen A Baltgalvis¹, Franklin G Berger, Maria Marjorette O Pena

¹Department of Exercise Science, University of South Carolina, Public Health Research Center, 921 Assembly Street, Columbia, SC 29208, USA.

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology

|December 7, 2007

Summary

Interleukin-6 (IL-6) drives cachexia in Apc(Min/+) mice by causing muscle and fat loss. Reducing IL-6 levels prevents wasting, while its overexpression exacerbates it, highlighting IL-6's critical role in tumor-induced cachexia.

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Area of Science:

Oncology
Molecular Biology
Physiology

Background:

The Apc(Min/+) mouse model exhibits intestinal polyposis and cachexia, characterized by significant muscle and fat tissue loss.
Cachexia development is linked to tumor burden and systemic inflammation, but the precise molecular mechanisms remain unclear.

Purpose of the Study:

To investigate the role of circulating interleukin-6 (IL-6) and intestinal polyp burden in the development of cachexia in Apc(Min/+) mice.
To elucidate the necessity of IL-6 for muscle and adipose tissue wasting and its influence on tumor progression.

Main Methods:

Comparison of wild-type Apc(Min/+) mice with Apc(Min/+)/IL-6(-/-) knockout mice.
Assessment of cachexia indicators including gastrocnemius muscle weight and epididymal fat pad mass.

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Quantification of circulating IL-6 levels and intestinal polyp burden.

Experimental IL-6 overexpression in Apc(Min/+)/IL-6(-/-) mice.

Main Results:

Severely cachectic Apc(Min/+) mice showed significantly reduced muscle and fat mass, elevated IL-6, and increased polyp burden compared to mildly cachectic mice.
Apc(Min/+)/IL-6(-/-) mice exhibited no significant loss of muscle or fat mass and had fewer polyps.
IL-6 overexpression in Apc(Min/+)/IL-6(-/-) mice induced muscle and fat wasting and increased polyp burden, but did not cause cachexia in non-tumor-bearing mice.

Conclusions:

Interleukin-6 (IL-6) is essential for the development of adipose and skeletal muscle wasting in the Apc(Min/+) mouse model.
Circulating IL-6 levels play a critical role in regulating both cachexia and tumor burden in this model.
Targeting IL-6 may offer a therapeutic strategy for cachexia associated with intestinal tumors.