Pentadecapeptide BPC-157 administration cures strong alcohol-induced gastrointestinal lesions and restores sphincter pressure in rats.

The concept of cytoprotection, where a mild irritant pre-treatment protects the gastric mucosa from a stronger subsequent challenge, has been a cornerstone of gastrointestinal research. Similarly, adaptive cytoprotection describes the stomach's ability to resist damage from noxious agents. However, the initial mechanisms, especially when a strong irritant like pure alcohol is introduced orally, are not fully understood. This study revisits Robert's cytoprotection concept by investigating the immediate, widespread damage caused by strong alcohol, not just in the stomach but across the upper GI tract, including the tongue, esophagus, and gut sphincters. It proposes that the stable gastric pentadecapeptide BPC-157, a known cytoprotective mediator, could offer significant therapeutic benefits in this severe injury model, potentially elucidating the role of the nitric oxide (NO) system in this endogenous defense process.

Researchers administered strong (96%) alcohol to rats via two routes: directly into the stomach (intragastrically) or applied to the tongue and then swallowed (intra(per)-orally). They assessed lesions in the stomach, tongue, esophagus, and duodenum, as well as lower esophageal and pyloric sphincter pressures at multiple time points (1, 5, 15, 30 min; 1, 2, 24 h). Immediately after alcohol exposure, rats received intraperitoneal injections of either the stable gastric pentadecapeptide BPC-157 (0.01 mg/kg or 0.00001 mg/kg), the NOS-blocker L-NAME (5 mg/kg), the NOS-substrate L-arginine (100 mg/kg), or a control. Some groups received a combination of intra(per)-oral and intragastric alcohol to test the protective effect.

Direct intragastric administration of strong alcohol caused severe stomach ulcerations, widespread redness in the tongue, esophagus, and duodenum, and minimal sphincter pressures. In contrast, intra(per)-oral application (swallowed from the tongue) resulted in a spontaneous protective effect, leading to only minute gastric lesions and attenuated damage elsewhere, though sphincter pressures were still lowered. This suggests the tongue acts as an initial trigger for a defensive response. BPC-157 therapy provided a complete rescue. It apparently cured all alcohol-induced lesions, whether from intragastric or intra(per)-oral administration, and fully restored sphincter pressures to normal levels.

BPC-157 therapy amplified the spontaneously initiated beneficial mucosal effect seen with oral alcohol application and reversed the severe lesions from direct gastric application. Treatment with L-arginine offered only slight mucosal amelioration, while the NOS-blocker L-NAME aggravated the lesions, confirming the involvement of the nitric oxide system. However, neither of these NO-system agents had comparable effects to BPC-157 on restoring the dropped sphincter pressures.

Written by TitrateLab, separately from the study summarized above.