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Respiratory Syncytial Virus Disease

Respiratory Syncytial Virus Disease

Human respiratory syncytial virus (RSV) is a widespread pathogen that primarily targets infants and young children but also poses a serious health risk to elderly and immunocompromised individuals. Belonging to the Pneumoviridae family, RSV is a negative-sense, single-stranded RNA virus within the Pneumovirus genus. Its global health burden is significant, with millions of cases annually resulting in hospitalizations and mortality, particularly in resource-limited settings. Although most...

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An anticatalytic monoclonal antibody to avian plasminogen activator: its effect on behavior of RSV-transformed chick

L M Sullivan, J P Quigley

|June 20, 1986

Summary

A novel monoclonal antibody targeting plasminogen activator (PA) effectively inhibited cancer cell overgrowth and extracellular matrix degradation. This confirms PA

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Area of Science:

Biochemistry
Cell Biology
Virology

Background:

Rous sarcoma virus (RSV) transformation of chick embryo fibroblasts (CEF) leads to altered cellular behavior, including overgrowth and extracellular matrix (ECM) degradation.
Plasminogen activator (PA), a serine protease, is implicated in these transformation-associated processes, but its direct catalytic role requires further elucidation.

Purpose of the Study:

To develop a specific inhibitor for PA to investigate its direct role in cellular transformation and ECM degradation.
To characterize the anticatalytic properties of a monoclonal antibody against PA.

Main Methods:

Generation and selection of a monoclonal antibody against PA from RSV-transformed chick embryo fibroblasts (RSVCEF).
Inhibition assays using the monoclonal antibody to assess its effect on RSVCEF overgrowth, morphological changes, and ECM degradation.
Immunoaffinity purification of PA and demonstration of its direct catalytic activity on ECM proteins in the absence of plasminogen.

Main Results:

A highly specific monoclonal antibody was successfully raised against PA, capable of inhibiting its catalytic activity.
Microgram quantities of the monoclonal IgG significantly inhibited RSVCEF overgrowth, morphological alterations, and ECM degradation.
Purified PA directly cleaved ECM proteins, confirming its catalytic role in matrix degradation independent of plasminogen.

Conclusions:

The monoclonal antibody provides a valuable tool for studying PA's function in cellular processes.
PA plays a direct catalytic role in the overgrowth and ECM degradation associated with RSV-induced cell transformation.
Targeting PA activity could be a strategy to control cellular transformation and matrix remodeling.