A C57BL/6 (CD45

A C57BL/6 (CD45.2) mouse was infected with influenza and joined parabiotically to a na?ve B6.SJL mouse (CD45.1) at 4 wpi. (I) Representative circulation cytometry plots showing the participation of CD45.2 founder and CD45.1 invader cells in mLN GCs of the infected CD45.2 parabiont at 8 wpi. the center of the pie charts denote how many invaders and founders were sequenced, respectively, when GC B cell samples were sorted in an unbiased manner (therefore the zero fate-mapped cells in some pie charts). Additional plates of rare fate-mapped GC B cells were sorted for late time points (16 and 24 wpi)(B,C) Representative circulation cytometry plots from data presented Butein in Fig. 2K and ?and2L,2L, showing frequency of GC B cells (FAS+CD38low) among total B cells (B220+) (B) and frequency of fate-mapped B cells among all GC B cells (C) in the mLN of tamoxifen-pulsed S1pr2-Tomato mice at different time points after SARS-CoV-2 Butein infection. NIHMS1859319-product-2.pdf (1.0M) GUID:?EA124734-6953-40A7-A916-79FBC4D93AFF 3: Number S3. Tfh exchange pattern in long-lived germinal centers, related to Number 2 (A) Experimental setup.(B, C) 8 weeks after illness (4 weeks after surgery), pairs were sacrificed and the frequency of Tfh/GC B cells (B), alongside the chimerism in the B cell (GC and non-GC B) and T cell compartments (Tfh and non-Tfh), was analyzed in the infected mouse (CD45.1/1), and the degree of chimerism in Tfh cells is shown like a graph, in multiple pairs analyzed Butein (C). NIHMS1859319-product-3.pdf (712K) GUID:?D616BAbdominal8-55A0-4977-AF8C-C7E02110B7FB 4: Number S4. Clonal and transcriptional characteristics of founder and invader B cells, related to Number 4(ACD) Biological interpretation of the clusters growing from scRNAseq data. We chose a resolution at which GC B cells could be resolved into 9 clusters defined by GC zone, cell cycle stage (as assigned by transcriptional signature), and post-GC fates (A). (Cluster 7) and and (Cluster 8), likely representing GC B cells en route to export as memory space B cells and plasmablasts, respectively. Cluster 5 contained a mixture of cells from different zones and in different phases of cell cycle. Lower detection of ribosomal protein-encoding mRNAs with this cluster (not shown) is definitely suggestive of a technical artifact of the method with this cluster. (E) Heatmap showing genes differentially indicated between tdTomato+ founder and tdTomato? invader B cells at 8 wpi. NIHMS1859319-product-4.pdf (2.0M) GUID:?2BD3C70F-E7AD-4692-BE38-0D5451E9C6F8 5: Figure S5. Binding characteristics of invader and founder B cells in LLGCs, related to Numbers 5 and ?and66 (A) Experimental setup.(B) Flow cytometry plots showing the frequency of endogenous and parabiont-derived GC B cells that bind HA in the na?ve (hypermutation in the mediastinal lymph node (mLN) in response to influenza illness. We infected cohorts of wild-type C57BL/6J mice intranasally with 33 plaque forming devices (p.f.u.) of mouse-adapted influenza A/Puerto Rico/8/1934 (PR8) disease and harvested mLNs at different time points up to 24 weeks post-infection (wpi). Large GCs were obvious at 2 and 4 wpi, when GC-phenotype cells (CD38low/? Fashi) accounted for an average of 15% of all B Butein cells in the Butein mLN (Fig. 1A and Fig. S1). Following this maximum, GC size decayed in two unique phases. First, there was a rapid decrease from 15% to 6.4% of GC B cells between 4 and 8 wpi. This decrease was followed by a period of relative stability, during Rabbit Polyclonal to ADH7 which GC B cells fluctuated in rate of recurrence between 4.2% and 2.2% of all B cells, consistently higher than the background of GC B cells in the mLN of uninfected co-housed littermates (Fig. 1A) and in line with earlier publications using related influenza models16,19. Staining with H1PR8 tetramers showed that the proportion of GC B cells that bound HA, while highly variable, tended to decrease with time. Still, HA-binding B cells were observable in some mice as late as 24 wpi (Fig. 1B). Open in a separate window Number 1. Kinetics and mutation profile of influenza-primed LLGCs up to 6 months after illness.(A,B) Representative circulation cytometry plos showing frequency of GC B cells (FAS+CD38low) among total B cells (B220+) and frequency of HA-binding B cells among all GC B cells in the mLN of wild-type C57BL/6 mice at different time points after influenza illness. Graphs on the right display pooled data.