Parasite infection and caloric restriction induce physiological and morphological plasticity

Area of Science:

• Physiology
• Parasitology
• Nutritional Science

Background:

• Parasitism and caloric restriction are common environmental stressors.
• Understanding their combined effects is crucial for host adaptation and health.

Purpose of the Study:

• To investigate the combined effects of parasitism and caloric restriction on mouse morphology and physiology.
• To determine how these factors influence body composition, organ mass, resting metabolism, and intestinal glucose transport.

Main Methods:

• Laboratory mice were subjected to intestinal parasites (Heligmosomoides polygyrus), 30% caloric restriction, or both.
• Morphological (body composition, organ mass) and physiological (resting metabolism, intestinal glucose transport) parameters were measured.

Main Results:

• Caloric restriction reduced body mass and resting metabolism but enhanced glucose transport.
• Parasitism maintained body mass, reduced glucose transport, and increased resting metabolism.
• Combined effects showed smaller organ masses and blunted glucose uptake enhancement in parasitized, restricted mice.

Conclusions:

• Parasitism and caloric restriction induce distinct and interactive phenotypic changes.
• Findings offer insights into helminthiasis in food-restricted human populations and wild animal adaptation.