Related Experiment Video
Updated: Aug 18, 2026

Determination of the Relative Potency of an Anti-TNF Monoclonal Antibody (mAb) by Neutralizing TNF Using an In Vitro Bioanalytical Method
Published on: September 16, 2017
Effects of tumour necrosis factor on protein metabolism
D A Evans1, D O Jacobs, D W Wilmore
1Department of Surgery, Harvard Medical School, Brigham and Women's Hospital, Boston, Massachusetts 02146.
Abstract:
Increased skeletal muscle breakdown and negative nitrogen balance are features of sepsis that may be mediated by cytokines. The effects of tumour necrosis factor (TNF) on protein metabolism were studied. When administered to anaesthetized dogs (0.57 x 10(5) units per kg body-weight over 6h), TNF caused urinary nitrogen excretion to increase (mean(s.e.m.) 165(15) mg kg-1 for dogs that received TNF versus 113(8) mg kg-1 for control animals, P < 0.01). Amino acid nitrogen release from the hindlimbs showed no change over the study period, indicating that the additional urinary nitrogen was not derived from peripheral protein stores. In a second study the same dose of TNF or saline was infused after the intestine had been removed. The mean(s.e.m.) urinary nitrogen excretion in control dogs that had undergone enterectomy (101(7) mg kg-1) was similar to that of intact animals, and addition of TNF did not significantly increase nitrogen excretion (86(18) mg kg-1). The results suggest that nitrogen excreted in the urine during administration of TNF is derived, at least initially, from the intestinal tract.
More Related Videos
11:44A Primary Human Trophoblast Model to Study the Effect of Inflammation Associated with Maternal Obesity on Regulation of Autophagy in the Placenta
Published on: September 27, 2017
08:19Transfer of Manipulated Tumor-associated Neutrophils into Tumor-Bearing Mice to Study their Angiogenic Potential In Vivo
Published on: July 20, 2019
Related Concept Videos
NF-κB-dependent Signaling Pathway
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
The Tumor Microenvironment
mTOR Signaling and Cancer Progression
The mTOR pathway or the...
PI3K/mTOR/AKT Signaling Pathway
TGF - β Signaling Pathway
Overview of Protein Metabolism
Amino acids play various roles in the body once they are absorbed into cells. They are restructured...