EFFECTS OF MECHANICAL AGITATION AND OF TEMPERATURE UPON COMPLEMENT

Area of Science:

• Immunology
• Biochemistry

Background:

• Complement activity in guinea pig serum is crucial for immunological assays.
• Understanding factors affecting complement stability is essential for reliable experimental results.

Purpose of the Study:

• To investigate the impact of mechanical agitation and heat on guinea pig complement activity.
• To determine the optimal conditions for preserving complement function in laboratory settings.

Main Methods:

• Guinea pig serum was subjected to mechanical agitation at different temperatures (10°C and 37°C) for varying durations.
• Serum samples were also heated at temperatures above 45°C, approaching 55°C, for specific time intervals.
• Complementary activity was assessed by measuring the remaining functional complement levels.

Main Results:

• Mechanical agitation at 37°C progressively destroyed complement activity, with near-complete loss after six hours. Agitation at 10°C had minimal effect.
• Short periods of agitation (within one hour) at 37°C did not significantly alter complement activity, suggesting suitability for complement fixation experiments.
• Heating guinea pig serum above 45°C, particularly near 55°C, reduced complement activity substantially but did not completely abolish it.
• The rate of complement destruction at 55°C was irregular and not directly proportional to exposure time, exhibiting a rhythmic pattern of destruction.

Conclusions:

• Incubation steps involving brief mechanical agitation in complement fixation experiments are unlikely to compromise results.
• Complement in guinea pig serum retains partial activity even after exposure to temperatures around 55°C, contrary to common assumptions.
• Further research into the irregular kinetics of complement thermal inactivation may reveal underlying mechanisms.