Antimicrobial peptides (LL-37, defensins, S100 proteins, lipocalin 2, RNase 7) are overexpressed in psoriatic skin and link innate and adaptive immune responses driving disease progression.
5 AMP classesLL-37, β-defensins, S100 proteins, lipocalin 2, and RNase 7 all overexpressed and immunomodulatory in psoriasis
What the researchers found
LL-37, defensins, S100 proteins, lipocalin 2, and RNase 7 are highly expressed in psoriatic skin and bridge innate and adaptive immune responses in disease pathogenesis.
Why it matters
Understanding how AMPs drive psoriasis — rather than just defend against infection — could lead to targeted therapies that modulate specific AMP functions without compromising antimicrobial defense.
The numbers in context
LL-37, hBD1-4, S100 proteins, lipocalin 2, RNase 7 all highly expressed in psoriatic lesions
How the study worked
Narrative review of recent literature on AMPs in psoriasis, focusing on immunomodulatory mechanisms linking innate and adaptive immunity.
Who was studied
Review of literature on AMPs in psoriasis: LL-37, hBD1-4, S100 proteins, lipocalin 2, RNase 7
What this study cannot tell us
Narrative review — no systematic search methodology; mostly mechanistic data from in vitro and animal studies; clinical implications of AMP-targeting therapies largely speculative.
How to read the evidence
Moderate — well-supported review of established findings in psoriasis AMP biology.
When this study was published
Published in 2020; AMP roles in autoimmune skin disease continue to be refined.
The bigger picture
LL-37's role in psoriasis (activating dendritic cells via DNA complexes) was a landmark discovery. This review integrates newer findings showing that multiple AMP classes cooperate in driving psoriatic inflammation.
Questions still open
- Could selectively blocking LL-37's immunomodulatory function (while preserving antimicrobial activity) treat psoriasis?
- Which AMP is the most critical driver of psoriasis — LL-37, defensins, or S100 proteins?
- Do AMP-targeting therapies risk increasing infection susceptibility?
Common questions
Why do protective peptides cause psoriasis?
Is LL-37 the main culprit?
Read the original research
Antimicrobial peptides: bridging innate and adaptive immunity in the pathogenesis of psoriasis.
Chinese medical journal, 133(24), 2966-2975
Citation
Ma, Jing-Yi; Shao, Shuai; Wang, Gang. (2020). Antimicrobial peptides: bridging innate and adaptive immunity in the pathogenesis of psoriasis.. Chinese medical journal, 133(24), 2966-2975. https://doi.org/10.1097/CM9.0000000000001240