lichen

Lichenase (endo-1,3:1,4-β-D-Glucanase), an endo-(1-3),(1-4)-β-D-glucan 4-glucanohydrolase, efficiently solubilizes β-glucans from cereal grains, producing gluco-oligosaccharides (GOS). This enzyme is pivotal for the degradation of cell wall polysaccharides [1] [2].

Rilopirox (HOE 351) initiated a novel antifungal compound for the study of mucosal Candida infections, lichen planus and seborrheic dermatitis.

Usenamine A is a small molecule compound derived from lichen Usnea longissima that has antitumor activity and can be used in the study of tumors.

Temarotene (Ro 15-0778) is an orally active and potent small molecule compound that modulates human immune function in vitro.Temarotene may be used in the study of lichen planus.

(+)-Usnic acid (D-Usnic Acid) is a naturally occurring dibenzofuran derivative found in several lichen species.

Vulpinic Acid (Pulvinic acid methyl ester) is a lichen metabolite with anti-inflammatory, antibacteria, properties, plant growth inhibitor.

Povorcitinib phosphate is a selective JAK1 inhibitor and can be used in studies about the treatment of cutaneous lupus erythematosus and Lichen planus.

Lobaric acid is a depsidone metabolite isolated from Stereocaulon lichen species with antioxidant, antiproliferative, antiviral, and enzyme inhibitory activities. It scavenges superoxide radicals in a cell-free assay (IC50 = 97.9 μmol), inhibits proliferation in a panel of leukemia, colorectal, gastric, breast, ovarian, prostate, pancreatic, and lung cancer cell lines (EC50s = 15.2-63.9 μg ml), inhibits protein tyrosine phosphatase 1B (PTP1B; IC50 = 0.87 μM for the human recombinant enzyme), and inhibits production of 12(S)-HETE [Item No. 34570] by 12(S)-lipoxygenase (IC50 = 28.5 μM). In vivo, lobaric acid (250 μM) reduces lesion number, but not lesion diameter, in tobacco leaves infected with tobacco mosaic virus (TMV).

Olivetol (5-n-Amylresorcinol) (5-pentylresorcinol, 5-pentyl-1,3-benzenediol) is an organic compound found in certain species of lichen; it is also a precursor in various syntheses of tetrahydrocannabinol. Olivetol has an antioxidant effect.

Atranorin shows significant antinociceptive and antiinflammatory activities, it has a relevant redox-active action, acting as a pro-oxidant or antioxidant agent depending on the radical, also, it will exert cytoprotective effects on cells under oxidative

Povorcitinib is a highly potent and selective JAK1 inhibitor with significant potential for the investigation of cutaneous lupus erythematosus (CLE) and Lichen planus (LP).

Galbinic acid is a depsidone lichen metabolite that has been found in U. undulata.1,2 It is active against the Gram-positive bacteria B. cereus, B. subtilis, and S. aureus, but not S. epidermidis (MICs = 62.5, 62.5, 250, and >250 μg/ml, respectively), as well as the Gram-negative bacterium E. coli, but not S. sonnei (MICs = 125 and >250 μg/ml, respectively).3 |1. Salgado, F., Albornoz, L., Cortéz, C., et al. Secondary metabolite profiling of species of the genus Usnea by UHPLC-ESI-OT-MS-MS. Molecules 23(1), E54 (2017).|2. Elix, J.A., and Engkaninan, U. The structure of galbinic acid. A depsidone from the lichen Usnea undulata. Aust. J. Chem. 28(8), 1793-1797 (1975).|3. Sultana, N., and Afolayan, A.J. A new depsidone and antibacterial activities of compounds from Usnea undulata Stirton. J. Asian Nat. Prod. Res. 13(12), 1158-1164 (2011).

Sekikaic acid is a phenolic lichen metabolite that has been found in H. obscurata and has diverse biological activities. It scavenges superoxide and DPPH radicals in cell-free assays when used at a concentration of 0.5 µM. Sekikaic acid is active against the rg recombinant strain of respiratory syncytial virus (RSV; IC50 = 5.69 µg ml). It inhibits the protein-protein interaction between mixed lineage leukemia 1 (MLL1) and the GACKIX domain of CREB-binding protein (CBP; IC50 = 34 µM).

Cabenoside D (compound 8), a triterpenoid glycoside derived from the methanol extract of lichen root, exhibits anti-inflammatory activity. It effectively inhibits inflammation and the activation of early Epstein-Barr virus antigen (EBV-EA) induced by 12-O-tetracylacyl hormone-13-acetate (TPA) in mice [1].

Pimecrolimus (SDZ-ASM 981), a calcineurin inhibitor immunosuppressant, binds to the receptor macrophilin-12 (FKBP-12) forming a complex that blocks the calcium-dependent signal transduction cascade mediated by calcineurin.

Orsellinic acid, a compound obtained by treatment of Lecanoric acidy with alcohols, inhibits platelet-activating factor (PAF)-mediated neuronal apoptosis.

4-FPBUA, a semi-synthetic analog of lichen acid, enhances the functionality of cell-based blood-brain barriers (BBB) and increases the transport of β-amyloid (Aβ) in monolayer cells. Additionally, it acts as an inhibitor of mTOR, enhancing cellular autophagy (Autophagy) which can reverse BBB disruption in vivo, making it relevant for research in Alzheimer's disease.

Roccellic acid is a lichen secondary metabolite that has been found in R. montagnei and has antibacterial and anticancer activities.1,2 It is active against the bacteria S. gordonii and P. gingivalis (MIC = 46.9 μg/ml for both).1 Roccellic acid (100 μg/ml) inhibits proliferation of MDA-MB-231, MCF-7, and DLD-1 cancer cells by 65.3, 75.8, and 87.9%, respectively.2 |1. Sweidan, A., Chollet-Krugler, M., Sauvager, A., et al. Antibacterial activities of natural lichen compounds against Streptococcus gordonii and Porphyromonas gingivalis. Fitoterapia 121, 164-169 (2017).|2. Mishra, T., Shukla, S., Meena, S., et al. Isolation and identification of cytotoxic compounds from a fruticose lichen Roccella montagnei, and it's in silico docking study against CDK-10. Rev. Bras. Farmacogn. 27(6), 724-728 (2017).

Vulpinic and gyrophoric acids are known as ultraviolet filters for natural lichen populations, they can effectively prevent cytotoxic, apoptotic and cytoskeleton alterative activities of 2.5 J cm(2) UVB in a dose-dependent manner, suggest that vulpinic and gyrophoric acids can be promising cosmetic ingredients to photo-protect human skin cells. Gyrophoric acid also has anti-proliferative cytotoxic effect.

Salazinic Acid, a compound extracted from the Lichen Hypotrachyna cirrhata, has potential antioxidant activity and attenuates male sexual dysfunction and testicular oxidative damage in streptozotocin-induced diabetic albino rats.

Stictic Acid (Scopularic acid) is isolated from a Sumatran lichen Stereocaulon montagneanum and inhibits the growth of HT-29 human colon adenocarcinoma cells with an IC50 of 29.29 μg ml.