Discovery of Anti-inflammatory Peptides from Jack Bean Protein for Gut Health

Jenn Hoskins
29th June, 2024

Discovery of Anti-inflammatory Peptides from Jack Bean Protein for Gut Health

Jack Bean (Canavalia ensiformis)

Photo adapted from: Siddarth Machado / CC BY (Source)

Key Findings

  • Researchers from Hiroshima University studied the effects of Jack bean protein hydrolysate (JBPH) on intestinal inflammation
  • JBPH significantly reduced the production of the inflammatory molecule IL-8 in human intestinal cells
  • The anti-inflammatory effect of JBPH is due to its ability to inhibit key signaling pathways, specifically NF-κB and MAPK
Jack bean (JB), scientifically known as Canavalia ensiformis (L.) DC, is a legume rich in protein and widely cultivated in Indonesia. Recent research conducted by Hiroshima University has explored the potential of JB protein hydrolysate (JBPH) to mitigate intestinal inflammation, a condition associated with several diseases such as inflammatory bowel disease (IBD)[1]. This study aimed to investigate the anti-inflammatory effects of peptides generated from enzymatic hydrolysis of JB protein on human intestinal Caco-2BBe cells, a model for human intestinal epithelial cells. Intestinal inflammation often involves the overproduction of interleukin-8 (IL-8), a pro-inflammatory cytokine, in response to tumor necrosis factor (TNF)-α. The production of IL-8 plays a significant role in the inflammatory response, contributing to the pathogenesis of various intestinal disorders. The study utilized pepsin and pancreatin to hydrolyze JB protein, resulting in JBPH, which was then tested on Caco-2BBe cells stimulated with TNF-α. The findings showed that JBPH significantly reduced IL-8 expression at both protein and mRNA levels in these cells. The study employed immunoblot analysis to delve deeper into the mechanisms behind this anti-inflammatory effect. It was observed that JBPH reduced the TNF-α-induced phosphorylation of c-Jun-NH(2)-terminal kinase (JNK), nuclear factor kappa B (NF-κB), and p38 proteins. These proteins are part of signaling pathways that regulate inflammatory responses. Specifically, NF-κB and mitogen-activated protein kinase (MAPK) pathways are crucial for the expression of various inflammatory mediators, including IL-8. Further fractionation of JBPH using a Sep-Pak C18 column revealed that the 30% acetonitrile fraction exhibited significant anti-inflammatory activity. An ultrafiltration method indicated that relatively small peptides (< 3 kDa) were particularly effective in inhibiting IL-8 production. This aligns with prior studies demonstrating the efficacy of small peptides in modulating inflammatory responses[2][3]. The purification process involved reversed-phase and anion-exchange high-performance liquid chromatography (HPLC), which resulted in three peptide fractions with notable anti-inflammatory activities. Mass spectrometry analysis and in silico approaches were then employed to identify the potential bioactive peptides within these fractions. The study's findings suggest that peptides derived from JB protein can reduce TNF-α-induced inflammatory responses in Caco-2BBe cells by inhibiting the NF-κB and MAPK signaling pathways. This is consistent with earlier research showing that specific peptides can modulate these pathways to exert anti-inflammatory effects[3]. Additionally, the study highlights the potential of JBPH as a novel therapeutic approach to promote intestinal health, particularly by targeting key inflammatory pathways. In conclusion, the research conducted by Hiroshima University provides compelling evidence that JBPH can significantly reduce intestinal inflammation by modulating critical signaling pathways involved in the inflammatory response. This study not only underscores the therapeutic potential of JB-derived peptides but also opens new avenues for developing dietary interventions to manage intestinal inflammation and related disorders.

MedicineHealthBiochem

References

Main Study

1) Identification and Molecular Mechanism of Anti-inflammatory Peptides Isolated from Jack Bean Protein Hydrolysates: in vitro Studies with Human Intestinal Caco-2BBe Cells

Published 28th June, 2024

https://doi.org/10.1007/s11130-024-01201-x

Related Studies

2) Jack Bean (Canavalia ensiformis) Tempeh: ACE-Inhibitory Peptide Formation during Absorption in the Small Intestine.

https://doi.org/10.17113/ftb.61.01.23.7635

3) Isolation and identification of peptides from simulated gastrointestinal digestion of preserved egg white and their anti-inflammatory activity in TNF-α-induced Caco-2 cells.

https://doi.org/10.1016/j.jnutbio.2018.09.019


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