Background and study aims: Recently, the shielding method with
polyglycolic acid (PGA) fabric and fibrin glue (P-F method) has been reported to
prevent serious complications after endoscopic submucosal dissection (ESD).
However, the effectiveness and mechanism to prevent complications by this method
remain unclear and the corresponding basic research has not been fully
conducted.
Methods and results: We examined the effectiveness and mechanism of the
P-F method, using a surgical ESD model of canine stomach and in vitro
experiments. In the model experiment treated by P-F method or no treatment
(control), ulcer perforation or penetration occurred only in the control group,
but not in the P-F group. Microscopically, the P-F group showed less damages of
the ulcer lesion than that of the control group, showing thicker granulation
tissues including PGA fibers on the third day and excellent mucosal regeneration
on the fourteenth day. In vitro culture experiments showed that
fibroblasts proliferated at a significantly higher rate on PGA than on fibrin or
a complex thereof. However, under hydrochloric acid treatment, fibroblasts were
protected by fibrin, followed by the complex of both, and PGA.
Conclusion: The P-F method exhibited a protective effect against gastric
juice by fibrin glue to reduce tissue damages and a scaffold function of PGA
fabric to induce better granulation formation at the earlier phase, resulting in
excellent long-term tissue repair, on ulcer lesion following ESD, although the
results were based on basic experiments.