Postprandial morphological response of the intestinal epithelium of the Burmese python (Python molurus)

Area of Science:

• Comparative physiology
• Gastrointestinal biology
• Reptile biology

Background:

• The intestinal epithelium undergoes dynamic changes in response to feeding, particularly in species with infrequent, large meals.
• Understanding these adaptations is crucial for comprehending reptilian digestive strategies.

Purpose of the Study:

• To investigate the postprandial morphological adaptations of the Burmese python's intestinal epithelium.
• To characterize the changes in enterocytes, villi, and microvilli following a meal.

Main Methods:

• Fasting Burmese pythons were compared to those sampled at eight time points after feeding.
• Morphological changes were assessed using light microscopy, scanning electron microscopy, and transmission electron microscopy.
• Histochemical staining (Alizarine red S) was used to identify specific particles.

Main Results:

• Enterocyte width increased by 23% and villus length and intestinal mass significantly increased within 24 hours postfeeding.
• Enterocyte volume peaked at 80% increase by 6 days postfeeding, with lipid droplet accumulation observed.
• Microvilli length increased 4.8-fold within 24 hours, and spherical, bone-derived particles were identified within enterocytes.

Conclusions:

• The Burmese python intestine shows remarkable trophic plasticity, rapidly adapting its structure to accommodate large meals.
• These adaptations include significant enterocyte hypertrophy, villus elongation, and microvilli extension.
• The study identifies bone fragments as ingested material and highlights the reversal of these changes post-digestion.