immune responses

Lipopolysaccharides (LPS) derived from Escherichia coli 055:B5, are a unique component of the cell wall of Gram-negative bacteria. They are composed of three regions: lipid A, oligosaccharide core, and O-specific polysaccharide (O-antigen). Lipopolysaccharides help maintain the integrity of the cell outer membrane and protect bacteria from damage by bile salts and lipid antibiotics. Lipopolysaccharides are highly immunogenic antigens that can enhance immune responses and can be used to construct inflammatory models.

Kurarinone, a flavonoid derived from the shrub Sophora flavescens, exhibits anti-tumor, estrogenic, and anti-inflammatory activities, and shows a strong inhibitory effect on immune responses. Kurarinone may ameliorate chronic inflammatory skin diseases by suppressing pathogenic CD4(+) T-cell differentiation and the overall immune response.

Hydrocortisone (Cortisol) is a glucocorticoid hormone secreted by the adrenocortex. Hydrocortisone agonizes the glucocorticoid receptor, which promotes proteolytic metabolism, gluconeogenesis, capillary wall stabilization, and renal calcium excretion, as well as suppressing immune and inflammatory responses.

3-Indoleacrylic acid is a metabolite of tryptophan produced by Peptostreptococcus species. 3-Indoleacrylic acid has a beneficial effect on intestinal epithelial barrier function and mitigates inflammatory responses by immune cells.

Corticosterone (Kendall's compound B) is an adrenocortical steroid with salocorticoid and glucocorticoid activity that is orally active. Corticosterone is involved in the regulation of energy, immune responses, and stress responses in the body.

β-Interleukin I (163-171), human Acetateis a peptide that participate in the regulation of immune responses, inflammatory reactions, and hematopoiesis.

1-Kestose shows significant anti-hydroxyl radical potential. 1-Kestose can promote intestinal Lactobacillus number, and influence the microorganisms as well as the intestinal and systemic immune responses.

Lucideric acid A (Lucidenic acid A) is a modulator of JNK and p38 and enhances LPS-induced immune responses in monocytic THP-1 cells possibly via the modulation of p38 and JNK/MAPKs activation.

L-Kynurenine ((S)-Kynurenine) is a key intermediate in the breakdown pathway of tryptophan. L-Kynurenine is a substrate of kynureninase, KMO, and KAT associated with the suppression of antitumor immune responses. It has been shown to inhibit allogeneic T-cell proliferation and to increase malignant U87 glioma cell invasion into a collagen matrix.

3-Oxo-5β-cholanoic acid (Dehydrolithocholic acid) is a bile acid metabolite that inhibits TH17 cell differentiation by directly binding to the transcription factor RORγt with a Kd of 1.13 μM.

Platycoside A has hemolytic activity and adjuvant potential on the immune responses to Newcastle disease virus-based recombinant avian influenza vaccine. It induces the IgG and IgG1 antibody responses in the immunized mice.

Kaempferitrin (Lespenephryl) has antidepressant-like effect related to the serotonergic system, principally 5-HT1A. Kaempferitrin exerts cytotoxic and antitumor effects against HeLa cells. Kaempferitrin stimulates glucose-metabolizing enzymes, promotes glucose homeostasis. Kaempferitrin exerts immunostimulatory effects on immune responses mediated by splenocytes, macrophages, PBMC and NK cells. Kaempferitrin induces cytotoxic effects to include: cell cycle arrest in G1 phase and apoptosis via the intrinsic pathway in a caspase-dependent pathway.

Sarmentosin significantly lowers the SGPT level of patients suffering from chronic viral hepatitis, and shows a suppressive effect on cell-mediated immune responses in mice. It shows a good effect in lowering serum glutamate-pyruvate transaminase.

QS-21, an immunostimulatory saponin, is a potent vaccine adjuvant that stimulates both Th2 humoral and Th1 cell-mediated immune responses by interacting with antigen presenting cells (APCs) and T cells. Furthermore, QS-21 activates the NLRP3 inflammasome, leading to the release of cytokines IL-1β and IL-18, dependent on caspase-1.

1. Norisoboldine ((+)-Laurelliptine) might be a potential therapeutic agent for rheumatoid arthritis, and it functions through protecting joint destruction as well as regulating the abnormal immune responses. 2. Norisoboldine inhibits the macrophage activation and the resultant production of pro-inflammatory cytokines via down-regulating the activation of MAPKs signaling pathways rather than NF-κB.

Transglutaminase (TG) is a thiolase that induces intermolecular cross-linking of proteins, by catalysing the formation of isopeptide bonds between the γ-carboxamide group of glutamine residues and the primary ε-amine group of other compounds. The enzyme plays a role in a variety of physiological processes including coagulation, antimicrobial immune responses and photosynthesis.

Platycodin D2 , a less hemolytic saponin, can improve specific cellular and humoral responses to hepatitis B surface antigen in mice, it could be safely used as adjuvant eliciting Th1 and Th2 immune responses. Polygalacin D2 has anti-cancer activity, it e