Lunasin from Wheat Inhibits a Key Step in Cancer Gene Activation
The cancer-preventive peptide lunasin, found in wheat as well as soy, inhibits histone acetylation in a dose-dependent manner and remains bioactive after being eaten by rats.
Quick Facts
What This Study Found
Lunasin isolated from wheat seeds at different developmental stages inhibited core histone H3 and H4 acetylation in a dose-dependent manner. This is significant because histone acetylation is an epigenetic switch that can activate cancer-promoting genes.
Key findings included:
- Wheat was confirmed as a new dietary source of lunasin (previously found only in soy and barley)
- The peptide's identity was confirmed by Western blot and LC-ESI-MS mass spectrometry
- Lunasin extracted from livers of rats fed lunasin-enriched wheat also inhibited histone acetylation, confirming the peptide survives digestion intact and bioactive
- The amount of lunasin correlated strongly with the degree of histone acetylation inhibition
Key Numbers
How They Did This
Researchers extracted lunasin from wheat seeds at different developmental stages and confirmed its identity using Western blot and liquid chromatography electrospray ionization mass spectrometry (LC-ESI-MS). They measured histone acetylation inhibition using a non-radioactive histone acetyltransferase assay. For the bioavailability component, male Sprague-Dawley rats were fed lunasin-enriched wheat, and lunasin was then extracted from their livers and tested for histone acetylation inhibitory activity.
Why This Research Matters
Epigenetic changes — modifications to how genes are expressed without changing the DNA sequence — play a major role in cancer development. A naturally occurring food peptide that can block one of these cancer-promoting switches (histone acetylation) and survive digestion to reach internal organs is a compelling candidate for cancer chemoprevention through diet.
The Bigger Picture
Lunasin sits at the intersection of nutrition science, epigenetics, and cancer prevention. It's one of a small number of food-derived peptides with a defined molecular mechanism for cancer prevention — targeting histone acetylation. The finding that it's present in wheat (not just soy) broadens its potential dietary relevance, since wheat is consumed far more widely globally.
What This Study Doesn't Tell Us
This is a preclinical study using cell-free assays and a rat feeding model. No human data on lunasin's cancer-preventive effects exists. The histone acetylation inhibition was measured in vitro and in rat liver extracts — it's unclear whether the same effect occurs in human cells at dietary concentrations. The correlation between lunasin amount and acetylation inhibition, while strong, doesn't prove cancer prevention in whole organisms.
Questions This Raises
- ?Is the amount of lunasin in a normal wheat-containing diet sufficient to meaningfully inhibit histone acetylation in humans?
- ?Does lunasin's histone acetylation inhibition translate to reduced cancer risk in long-term human studies?
- ?Could lunasin-enriched wheat varieties be developed as a functional food for cancer chemoprevention?
Trust & Context
- Key Stat:
- Dose-dependent inhibition Lunasin from wheat blocked histone H3 and H4 acetylation proportionally to its concentration
- Evidence Grade:
- This is a preclinical laboratory study using cell-free assays and a rat model. While the mechanistic data is clear and well-controlled, the evidence is far from demonstrating cancer prevention in humans.
- Study Age:
- Published in 2007, this was an early study establishing wheat as a source of lunasin and confirming its oral bioavailability. Lunasin research has continued since, though human clinical data remains limited.
- Original Title:
- The cancer preventive peptide lunasin from wheat inhibits core histone acetylation.
- Published In:
- Cancer letters, 255(1), 42-8 (2007)
- Authors:
- Jeong, Hyung Jin(2), Jeong, Jin Boo(2), Kim, Dae Seop(2), Park, Jae Ho, Lee, Jung Bok, Kweon, Dae-Hyuk, Chung, Gyu Young, Seo, Eul Won, de Lumen, Ben O
- Database ID:
- RPEP-01244
Evidence Hierarchy
Frequently Asked Questions
What is lunasin and where is it found?
Lunasin is a 43-amino acid peptide found naturally in soybeans, barley, and wheat. It has shown cancer-preventive properties in laboratory studies by blocking histone acetylation, a process that can switch on cancer-promoting genes.
Can eating wheat provide cancer-preventive lunasin?
This study showed lunasin from wheat survives rat digestion and reaches the liver in an active form. However, whether the amounts in a normal diet are sufficient to prevent cancer in humans has not been established.
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Cite This Study
https://rethinkpeptides.com/research/RPEP-01244APA
Jeong, Hyung Jin; Jeong, Jin Boo; Kim, Dae Seop; Park, Jae Ho; Lee, Jung Bok; Kweon, Dae-Hyuk; Chung, Gyu Young; Seo, Eul Won; de Lumen, Ben O. (2007). The cancer preventive peptide lunasin from wheat inhibits core histone acetylation.. Cancer letters, 255(1), 42-8.
MLA
Jeong, Hyung Jin, et al. "The cancer preventive peptide lunasin from wheat inhibits core histone acetylation.." Cancer letters, 2007.
RethinkPeptides
RethinkPeptides Research Database. "The cancer preventive peptide lunasin from wheat inhibits co..." RPEP-01244. Retrieved from https://rethinkpeptides.com/research/jeong-2007-the-cancer-preventive-peptide
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkPeptides research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.