LL-37 is a cationic and α-helical antimicrobial peptide expressed in human bone marrow, testis, granulocytes, and gingival epithelium and is upregulated in psoriatic lesions. It inhibits growth of Gram-positive E. coli D21 and Gram-negative B. megatarium in a concentration-dependent manner and LL-37 expression is induced in A549 epithelial cells, alveolar macrophages, neutrophils, and monocyte-derived macrophages following M. tuberculosis infection. LL-37 binds sheep erythrocytes coated with S. minnesota Re-LPS and induces agglutination with a minimal agglutinating concentration (MAC) of 12.1 μg/ml. It is a chemoattractant for, and can induce calcium mobilization in, human monocytes, neutrophils, and T cells that naturally express formyl peptide receptor-like 1 (FPRL1) and FPRL1-transfected HEK293 cells. LL-37 (10-15 μM) pretreatment of dengue virus type 2 (DENV-2) reduces its infectivity as well as levels of viral genomic RNA and NS1 antigen. In vivo, LL-37 inhibits cecal ligation and puncture-induced caspase-1 activation and pyroptosis of peritoneal macrophages, reduces levels of the inflammatory cytokines IL-1β, IL-6, and TNF-α, and improves survival in polybacterial septic mice.
DENV-IN-2 is a highly effective inhibitor of dengue viral replication with a potency indicated by an EC 50 of 0.016 nM. It exhibits significant activity against all four serotypes of the Dengue virus, with EC 50 values ranging from 0.013 to 0.029 nM.
GAK inhibitor 2 (Compound 14g) is a highly potent inhibitor of cyclin G-associated kinase (GAK) with an IC 50 of 0.024 μM. It exhibits remarkable antiviral activity against dengue virus (DENV), with an EC 50 of 1.049 μM [1].
Caffeoylcalleryanin demonstrated potent inhibitory activity against 15-lipoxygenase (15-LOX), with an IC50 value of 1.59 μM. Furthermore, ethanol extract from A. pulchra leaves (EEAPL) was found to contain compounds exhibiting antiviral properties, particularly effective against Dengue virus type 2 (DENV-2). Among these compounds, Caffeoylcalleryanin emerged as the most potent anti-DENV-2 agent, achieving a selectivity index (SI) of 20.0.