Tumors secreting human TNF/cachectin induce cachexia in mice

Area of Science:

• Oncology
• Molecular Biology
• Immunology

Background:

• Cancer anorexia and weight loss significantly worsen patient outcomes.
• Tumor necrosis factor (TNF)/cachectin is a suspected cause of cancer cachexia.

Purpose of the Study:

• To investigate whether TNF/cachectin can induce progressive weight loss in tumor-bearing animals.
• To establish a model for studying TNF/cachectin-induced cachexia.

Main Methods:

• Isolated and inserted the human TNF/cachectin gene into an expression vector.
• Transfected CHO cells to create a TNF/cachectin-secreting cell line (CHO/TNF-20).
• Inoculated nude mice with CHO/TNF-20 cells or control cells (CHO/CMV-Neo).

Main Results:

• Mice injected with CHO/TNF-20 cells exhibited shorter survival times compared to controls.
• Eighty-seven percent of mice with intramuscular CHO/TNF-20 tumors developed severe cachexia and weight loss.
• Control group mice maintained or gained body weight.

Conclusions:

• Secreted TNF/cachectin from tumors induces progressive wasting in mice.
• TNF/cachectin contributes to accelerated mortality in tumor-bearing animals.
• This study validates TNF/cachectin as a key mediator of cancer cachexia.