An antimicrobial peptide of the cathelicidin family that provides innate immune defense by killing pathogens and modulating inflammation and wound healing.
LL-37 is a natural human peptide that kills many germs, but it’s pricey, breaks down quickly in the body, and can hurt our own cells. Scientists are tweaking its structure, adding protective carriers, and pairing it with regular antibiotics to make it safer, more stable, and better at breaking down tough bacterial films. The review shows these tweaks work in labs, but the stuff isn’t yet ready for everyday use and still faces cost and safety hurdles.
The study found that people with gum disease have higher levels of the antimicrobial peptide LL‑37 and its receptor FPR2 in their gums, and that too much LL‑37 makes gum cells more inflamed through FPR2, worsening the disease. This suggests that blocking this pathway could help treat periodontitis.
Wilkinson. Rachael C RC; Thomas. Nerissa E NE; Bhatti. Amita A; Burton. Matthew R MR; Joyce. Naomi N...
Researchers found that a virus‑derived peptide called gp28 can kill the tough bacteria Pseudomonas aeruginosa, break down its protective biofilm, and make the antibiotic tobramycin work better. It works at a concentration of about 109 µg/mL and shows promise as a new kind of antimicrobial, but it’s still early‑stage research and not yet a product you can buy or use.
Scientists found that the natural peptide LL‑37, which your body makes more of when you have enough vitamin D, can stick to the coronavirus spike protein and two other viral proteins, blocking the virus from attaching to cells in lab tests. This suggests that boosting LL‑37 might help fight COVID‑19, but the work is still early and done only in test‑tube experiments.
Human fat‑derived stem cells release substances that can kill tough bacteria like MRSA and Pseudomonas, even when those bugs can dodge the natural peptide LL‑37. The killing effect stays strong even though the amount of LL‑37 drops after the bacteria are added.
Jacobo-Delgado. Yolanda M YM; Rodríguez-Carlos. Adrián A; Santos-Mena. Alan A; Gonzál...
The study shows that a protein called CEBPα can turn on the antimicrobial peptide LL‑37 without needing vitamin D, and this helps cells kill the tuberculosis bacteria. They found that three existing drugs (mycophenolic acid, indapamide, and glibenclamide) can activate CEBPα, raise LL‑37 levels, and improve bacterial clearance in lab cells, suggesting they might be useful as extra help alongside standard TB treatment.
Mirzadzare. Niloofar N; Blyth. Graham A D GAD; Hannawayya. Rita R; Cirone. Karina M KM; Kilari. Geet...
The study shows that the natural antimicrobial peptide LL‑37 helps gut cells release mucus and protective proteins, which improves the gut’s ability to clear harmful bacteria. Mice lacking LL‑37 had weaker mucus release, more bacteria, and lower reactive oxygen species (ROS) in the gut. In human gut‑like cells, adding LL‑37 boosted secretion of key mucus‑associated proteins through a ROS‑dependent pathway.
Kurbatfinski. Nikola N; Jurscisek. Joseph A JA; Wilbanks. Kathryn Q KQ; Goodman. Steven D SD; Bakale...
The study shows that breaking up bacterial biofilms with a special antibody releases the bacteria, making them much more vulnerable to natural antimicrobial peptides like LL‑37 that our bodies already produce. This means that if biofilms can be disrupted, our own immune defenses could clear tough infections more easily, possibly reducing the need for strong antibiotics.
The study shows that the natural peptide LL‑37 can latch onto LDL (bad cholesterol) and make it easier for the liver and immune cells to pull it out of the bloodstream, helping clear cholesterol and prevent fat buildup in the liver in mice. While this points to a new way the body might naturally manage cholesterol, it’s still early‑stage research and not yet a ready‑to‑use protocol for people.
Researchers found that two fermented Dendrobium polysaccharide extracts can calm inflammation and boost skin‑protective proteins in lab cells, while also acting as powerful antioxidants. This points to their potential as skin‑health ingredients, but human studies and dosing guidelines are still missing.
Scientists tweaked a small piece of the natural antimicrobial protein LL‑37 called GF‑17 by swapping some amino acids for lysine. Changing lysine on the “hydrophobic” side made the peptide much better at killing microbes while being far less harmful to human cells, especially in a version named GF17‑8, which was about 25 times safer than the original.
Boleti. Ana Paula de Araújo APA; Jacobowski. Ana Cristina AC; Frihling. Breno Emanuel Farias BE...
The review explains that the natural peptide LL‑37 can both calm the immune system and kill stubborn bacteria in wounds, cutting biofilm levels by about 60%. It also talks about new tools like smart dressings and nano‑packaged peptides that could make LL‑37 work better, but it doesn’t give exact recipes or doses for everyday use.
Karaca. Fadime F; Bloch. Susanne S; Kendlbacher. Fabian L FL; Behm. Christian C; Schäffer. Chri...
Vitamin D3 (the form you get from sunlight or supplements) boosts the production of the antimicrobial peptide LL‑37 in mouth‑lining cells and reduces inflammation, helping these cells fight gum‑disease bacteria better. The study was done in a lab dish, so while it hints that good vitamin D levels could support oral health, real‑world effects still need human testing.
People with diabetic foot infections often lack vitamin D, and low vitamin D is linked to lower levels of the antimicrobial peptide LL‑37, more inflammation, longer hospital stays and more bacterial biofilm in wounds. Raising vitamin D could boost LL‑37 and help healing, but the study only shows associations, not proof that supplements work.
The study shows that the active form of vitamin D (1,25‑dihydroxyvitamin D) makes neutrophils produce more of the antimicrobial peptide LL‑37, which helps kill bacteria. When bacterial components (LPS) are present, they block the enzyme that normally breaks down vitamin D, so the vitamin‑D signal lasts longer and keeps the immune boost going. This suggests that having enough vitamin D could strengthen your innate immune defenses, especially during infections, but the work was done in lab cells, not in people.
In a mouse model of severe infection, giving diosgenin – a natural compound from yams – helped more mice survive by lowering inflammation and keeping the gut lining intact. It also boosted the mouse version of the antimicrobial peptide LL‑37 and dampened a key inflammatory pathway (TLR4/MyD88).
Jacobo-Delgado. Yolanda M YM; Trujillo-Paez. Valentin V; Santos-Mena. Alan A; Felix-Arellano. Cameli...
A lab study found that the skin drug retin‑A (tretinoin) boosts the production of the antimicrobial peptide LL‑37 and other healing factors in skin cells, and it helped those cells move to close a simulated wound. The other two drugs tested didn’t show any benefit. This suggests that topical retin‑A might improve skin repair, but the data are only from cell cultures, not real people.
The study found that higher vitamin D levels in the blood and especially in saliva are linked to higher amounts of the antimicrobial peptide LL-37, which helps protect the mouth from germs. This suggests that keeping your vitamin D status up could boost your oral immune defenses, but the research is just a correlation and doesn’t prove that taking vitamin D will automatically raise LL-37.
A lab study found that a fermented extract from the plant Aralia cordata can lower the activity of sugar‑transport proteins in gut cells, boost hormones that help control blood sugar, and increase immune‑supporting molecules like the antimicrobial peptide LL‑37. These effects were seen in cell cultures, so while promising, they haven’t been proven in people yet.
You. Jiayi J; Zhang. Qian Q; Qian. Linjue L; Shi. Zihan Z; Wang. Xinyue X; Jia. Lu L; Xia. Yang Y
Researchers found that stem cells taken from the tooth’s ligament can help heal gum damage and also change the mouth’s bacteria to a healthier mix, mainly because these cells release the antimicrobial peptide LL‑37 that kills bad bacteria like Staph, E. coli and Fusobacterium.