An antimicrobial peptide of the cathelicidin family that provides innate immune defense by killing pathogens and modulating inflammation and wound healing.
John. Preeti P PP; Baker. Brady C BC; Paudel. Santosh S; Nassour. Lauren L; Cagle. Hayden H; Kulkarn...
The study shows that having moderate sugar in your urine (like what can happen with high blood sugar) makes a common bacteria, Group B Strep, grow faster and become more aggressive, increasing the chance of a urinary tract infection. It also makes the bacteria better at resisting the body’s natural antimicrobial peptide LL‑37. For people interested in health optimization, this suggests that keeping blood sugar and urine glucose low could help reduce infection risk.
Scientists have added about 500 new natural antimicrobial peptides to the database, showing many new ways to fight drug‑resistant bugs. One of the well‑known human peptides, LL‑37, can be boosted by taking vitamin D, which may help the body’s first line of defense. While the paper mostly lists discoveries, the vitamin‑D link gives a simple, actionable tip for people looking to support their immunity.
Scientists created a new short protein (C‑L peptide) that mixes parts of two natural peptides, making it less toxic and better at calming gut inflammation caused by bacterial toxins. In mouse cells and live mice it lowered harmful inflammation signals, protected the gut lining, and prevented weight loss, mainly by binding and neutralizing the toxin LPS and blocking its receptor. It’s still early‑stage research, but shows a promising way to make safer, more effective anti‑inflammatory peptides.
Apigenin, a plant flavonoid, was shown in cell studies to cut down inflammation and allergic signals in immune cells and to boost skin‑protective proteins, including the antimicrobial peptide LL‑37, in skin cells. This suggests that apigenin could help strengthen the skin’s barrier and reduce irritation when used topically.
The study shows that vitamin D3 can boost the production of the antimicrobial peptide LL‑37 in gum‑related cells, and that this also lowers inflammation markers. It suggests that having enough vitamin D might help protect your gums, but the work was done in lab cells, not in people, so the real‑world effect is still uncertain.
A study in mice showed that putting the antimicrobial peptide LL‑37 into a chitosan gel makes the gel safe for skin cells, cuts inflammation, kills Staph bacteria, and speeds up healing of pressure sores. The treated wounds were smaller, had thicker skin layers and more new blood vessels compared with untreated or gel‑only controls.
Li. Kang K; Tao. Ningning N; Zheng. Lu L; Sun. Tieying T
The study shows that the natural peptide LL‑37 can help steroids work better in lung cells that are stressed by viral‑like double‑stranded RNA. In lab dishes and a mouse asthma model, LL‑37 teamed up with the viral mimic to boost anti‑inflammatory signals and block pathways that make steroids less effective. While promising, the work is still early and only in cells and mice, so it isn’t a ready‑to‑use protocol for people yet.
Bayirli. Batuhan A BA; Öztürk. Ayla A; Avci. Bahattin B
The study found that people with low vitamin D levels have less of the natural antimicrobial peptide LL-37 (and also hBD-2) in their gums and gum fluid, which could make gum disease worse. Keeping vitamin D in the sufficient range (≥20 ng/mL) appears to support higher levels of these protective peptides, regardless of whether you have gingivitis or periodontitis.
Al-Adwani. Salma S; Wallin. Cecilia C; Balhuizen. Melanie D MD; Veldhuizen. Edwin J A EJA; Coorens....
Scientists found that the natural antimicrobial peptide LL‑37 is present in human lungs, and it can be chemically changed (citrullinated) which makes it lose its ability to kill bacteria. The modified version still keeps its helical shape and is even more heat‑stable, but it no longer attacks microbes or red blood cells. This shows that the positive charge of LL‑37 is crucial for its antibacterial action.
Doolin. Tory T; Amir. Henry M HM; Duong. Leora L; Rosenzweig. Rachel R; Urban. Lauren A LA; Bosch. M...
The study shows that the antimicrobial peptide LL‑37 can open tiny holes in bacterial membranes, letting the protein histone H2A slip inside. Once inside, H2A messes up the bacteria’s DNA and stops them from making proteins, while LL‑37 keeps the membrane damaged. Together they kill bacteria far more effectively than either alone, and the combo even works with the antibiotic polymyxin B.
The study shows that the natural antimicrobial peptide LL‑37 can fight the common cold virus, but when the body’s PAD enzymes change parts of LL‑37 (a process called citrullination), its virus‑killing power drops. The virus itself makes cells produce more PAD enzymes, which may help it hide from the immune system.
Innocenti Malini. R R; Zabara. M M; Gontsarik. M M; Maniura-Weber. K K; Rossi. R M RM; Spano. F F; S...
Scientists used computer simulations to see how a skin-friendly lipid called glycerol monooleate (GMO) can team up with the antimicrobial peptide LL‑37 to form tiny carrier particles. These particles (micelles or vesicles) keep the peptide stable in water and make it work better against bacteria by exposing its charged parts and limiting its wobbliness.
A plant seed extract (VSP) from Vaccaria segetalis can boost the body's own antimicrobial peptide LL‑37 (called CRAMP in rats) and lower kidney bacterial counts in mouse and rat models of urinary‑tract infection. The effect seems to come from turning the immune system back on rather than directly killing the bacteria.
Santos. Juliana de Melo Batista Dos JMBD; Foster. Roberta R; Jonckheere. Anne-Charlotte AC; Rossi. M...
Regular outdoor running helps keep your lungs' immune system healthier even when you breathe polluted air, showing better anti‑viral and anti‑bacterial markers and lower inflammation compared to sitting around. The study didn’t find a big change in the LL‑37 peptide itself, but it showed that exercise shifts the immune response toward a more protective pattern.
Zhang. Meihua M; Liang. Weiwei W; Gong. Wanghua W; Yoshimura. Teizo T; Chen. Keqiang K; Wang. Ji Min...
LL-37 (in humans) and its mouse version CRAMP are natural antimicrobial peptides that do more than kill germs – they help keep the gut lining strong, balance gut bacteria, calm inflammation, and may protect against colon cancer. This review highlights how losing CRAMP in mice leads to gut problems and tumor growth, suggesting that boosting LL-37 could be a useful strategy for gut health and disease prevention.
Zhang. Lulu L; Wei. Xubiao X; Zhang. Rijun R; Koci. Matthew M; Si. Dayong D; Ahmad. Baseer B; Cheng....
Researchers made a new version of the natural peptide LL‑37 called LTA_a, which is more stable and less toxic. In mice with a weakened immune system, LTA_a boosted immune organ size, helped macrophages eat more, balanced T‑cell types, and raised important immune signaling proteins. It works by attaching to the TLR4 receptor and turning on the NF‑κB pathway, suggesting it could help improve immunity, but it’s still only tested in animals.
Woodburn. Kathryn Wynne KW; Jaynes. Jesse M JM; Clemens. L Edward LE
Researchers created a new antimicrobial peptide called RP557, modeled after the natural human peptide LL-37. In lab tests and mouse wound models, RP557 killed a wide range of bacteria and fungi, stopped biofilm formation, and didn’t cause resistance like some antibiotics do. While the results are promising, the peptide isn’t yet available for human use, so it’s more of a future option than something you can try now.
Researchers tested tiny lipid particles called cubosomes to carry the antimicrobial peptide LL-37 onto skin. They found that when LL-37 is loaded into these particles before they’re formed, the peptide stays protected from enzymes, doesn’t irritate skin, and kills Staphylococcus aureus effectively in a pig‑skin wound model. The study shows a promising way to make LL-37 more stable for topical use, though making cubosomes at home would be technically challenging.
The paper reviews how the natural human antimicrobial peptide LL‑37 can be trimmed and re‑designed into more powerful versions that kill bacteria, fungi, viruses and even cancer cells, and it notes that things like vitamin D and sunlight can boost your body’s own LL‑37 production. While the engineered peptides are still experimental, the review highlights promising candidates and ways to naturally enhance this innate‑immune molecule.
Rajasekaran. Ganesan G; Kumar. S Dinesh SD; Yang. Sungtae S; Shin. Song Yub SY
Researchers created a short version of a chicken antimicrobial peptide and tweaked its sequence to make it both kill bacteria and calm inflammation, without harming human red blood cells. This engineered peptide works better than the human peptide LL‑37 against drug‑resistant bugs, stays active in salty or serum environments, and boosts the effect of common antibiotics.