Project description:Tumor-infiltrating T lymphocytes (TILS) plays a pivotal role in immunotherapy, but the dynamic relationships of the T cells reacted on the therapy remains elusive. T cell receptor (TCR) repertoire, serving as lineage tags, could track these tumor-infiltrating T lymphocytes. Here, in order to deconvolve TILS heterogeneity after therapy in a comprehensive catalog, we presented single T-cell analysis by RNA-seq and TCR tracking of a 22,590 T cells from colorectal carcinoma under control conditions and during Stellera chamaejasme and anti-PD-1 activation. We reveal a highly complex microenvironment which profoundly molds T lymphocytes, as well as the combinatorial impact of TCR utilization on phenotypic diversity. scRNA-seq identified distinct CD8 T cells subtypes CD8 naïve and CD8 cytoxic cells(CD8 CTL), also, CD4 T cell subpopulations Regulatory T(Tregs) cells and T helper cell 17(Th-17). Stellera chamaejasme activation triggered CTSW, ICOS, etc. in CD8 T cells, whose the dramatic differentiation into from a single time point. At the same time, Stellera chamaejasme plus anti-PD-1 therapy have a strikingly effect on the balance between Tregs and Th-17. Our integrated analyses provide a powerful avenue to disclose the TILS in CRC based on TCR and demonstrate novel functional interactions among TILS subpopulations during Stellera chamaejasme plus anti-PD-1 therapy.
Project description:An undescribed diterpene, stellerterpenoid A (1), and two undescribed sesquiterpenoids, stellerterpenoids B and C (2-3), together with six known compounds, prostratin (4) stelleraguaianone B (5), chamaejasnoid A (6), auranticanol L (7), wikstronone C (8), and oleodaphnone (9), were isolated from the roots of Stellera chamaejasme L. Their structures were elucidated by extensive spectroscopic data (1D, 2D NMR, IR, UV, and HR-ESI-MS). The absolute configuration of 1-3 was elucidated based on ECD calculation. Among them, stellerterpenoid A was a rare 13, 14-seco nortigliane diterpenoid and stellerterpenoid B was a guaiacane-type sesquiterpenoid with an unusual 1, 2-diketone moiety. The known stelleraguaianone B (5) exhibited moderate activity for suppressing NO production in lipopolysaccharide (LPS)-treated RAW 264.7 macrophages cells with an IC50 value of 24.76 ± 0.4 μM. None of the compounds showed anti-influenza virus or anti-tumor activity in vitro.
Project description:A new dicoumarinyl ether, 3-hydroxy-6-methoxy-7,7'-dicoumarinyl ether (1), was isolated from the roots of Stellera chamaejasme L, together with the known compound umbelliferone (2). Their structures were determined on the basis of spectroscopic techniques, including IR, NMR, and HR-ESI-MS.