Osteopenia after gastrectomy, fundectomy or antrectomy: an experimental study in the rat

Area of Science:

• Bone Metabolism Research
• Surgical Endocrinology
• Gastrointestinal Physiology

Background:

• Gastrectomy, the surgical removal of the stomach, is known to induce osteopenia, a condition characterized by reduced bone mass.
• The specific contribution of different stomach resections to gastrectomy-evoked osteopenia remains unclear.

Purpose of the Study:

• To investigate whether removing specific portions of the stomach can replicate the osteopenia observed after a full gastrectomy.
• To determine the role of different stomach regions in bone metabolism.

Main Methods:

• Rats underwent gastrectomy, fundectomy (removal of the acid-producing fundus), or antrectomy (removal of the gastrin-producing antrum).
• Bone tissues (calvariae, tibiae, femurs) were analyzed using histomorphometry, microtomography, and transillumination at various time points post-operation.

Main Results:

• Fundectomy, like gastrectomy, led to significant osteopenia and reduced bone volume in the tibia and calvaria, primarily affecting trabecular bone.
• Antrectomy had a less pronounced effect on bone density.
• Cortical bone in the femur showed minimal reduction compared to trabecular bone.

Conclusions:

• Selective resection of the acid-producing stomach region (fundectomy) can reproduce gastrectomy-evoked osteopenia in rats.
• The acid-producing oxyntic mucosa, not gastrin deficiency, appears crucial for maintaining bone metabolism.
• The findings highlight the stomach's significant role in bone health, with potential involvement of enterochromaffin-like (ECL) cells in the oxyntic mucosa.