The natural defense system and the normative self model

Area of Science:

• Immunology
• Systems Biology
• Physiology

Background:

• The immune system is traditionally viewed as the primary defender against pathogens.
• However, complex organisms face diverse internal and environmental hazards beyond infections and cancers.
• A broader perspective is needed to understand the organism's complete defense strategy.

Purpose of the Study:

• To introduce and elaborate on the 'normative self model' as a framework for understanding natural defense systems.
• To explain how this model encompasses a wider range of threats than just infections.
• To detail the mechanisms and cellular components involved in maintaining the body's integrity.

Main Methods:

• Conceptual framework development based on the 'normative self model'.
• Description of error detection and correction mechanisms at various organizational levels.
• Distinction between 'civil defenses' (non-mobile cells) and a 'professional army' (mobile cells).

Main Results:

• The 'normative self model' proposes a natural defense system protecting against diverse hazards.
• This system relies on physiological norms to define 'self' and identify 'NONself' (deviations from norms).
• Robustness is achieved through integrated error detection and correction, involving both static and dynamic cellular components.

Conclusions:

• The natural defense system is a multi-layered network essential for organismal robustness.
• Mobile cells ('professional army') require periodic calibration by stable non-mobile cells ('civil defenses') to maintain accurate self/NONself discrimination.
• This model provides an enlarged perspective on biological defense beyond traditional immunological paradigms.