rabbit polyclonal antibody to cd8  (Proteintech)

Journal: Frontiers in Immunology

Article Title: Double negative T cells (CD4 - /CD8 - ) are associated with Trypanosoma cruzi persistence in the mouse colon during chronic Chagas disease

doi: 10.3389/fimmu.2026.1761769

Figure Lengend Snippet: Multiparameter spectral flow cytometry analysis of immune cells of the colonic lamina propria during acute and chronic T. cruzi infection. C57BL/6 mice were infected with 10 4 T. cruzi (TcCol-Nluc). Colonic lamina propria cells were isolated from uninfected (Control), acutely infected (Acute, 30 dpi) and chronically infected (Chronic, 90 dpi) mice and analysed by flow cytometry using the gating strategy shown in Supplementary Figure 1 . (A) Automated T-distributed stochastic neighbour embedding (t-SNE) 2D map of the flow cytometry data acquired from control and infected mice colon. (B) Upper panel; tSNE 2D map showing scaled expression of CD11b for myeloid cells, B220 for B cells and CD3 for T cells. Lower panel; tSNE 2D map showing the location of CD11b + myeloid cells, B220 + B cells and CD3 + T cells. (C) Heat maps for (left) cell surface markers expression (CD45, CD11b, B220, CD3, CD4 and CD8) and (right) groups (control, acute and chronic colons) for 22 cell clusters identified. (D) Percentage of each cluster for each group. Panel (D) shows auto-scaled cluster frequencies optimized for visualization within each group. For standardized quantitative comparison across groups, refer to the heat map in panel (C) . Arrows in (C) and (D) indicate immune cell clusters of myeloid cells (blue), B cells (green) or T cells (red).

Article Snippet: Antibodies were polyclonal goat IgG anti-mouse CD4 antibody (R&D Systems, MN), polyclonal rabbit IgG anti-mouse CD8 antibody (Novus Biologicals, CO), monoclonal Rat IgG2b Alexa Fluor ® 647 anti-mouse CD3 Antibody (BioLegend, CA), Donkey anti-Goat IgG (H+L) Cross-Adsorbed Secondary Antibody, Alexa FluorTM 488 (Thermo Fisher Scientific, CA), Donkey anti-Rabbit IgG (H+L) Highly Cross-Adsorbed Secondary Antibody, Alexa FluorTM 568 (Thermo Fisher Scientific, CA) ( ).

Techniques: Flow Cytometry, Infection, Isolation, Control, Expressing, Comparison

Journal: Frontiers in Immunology

Article Title: Double negative T cells (CD4 - /CD8 - ) are associated with Trypanosoma cruzi persistence in the mouse colon during chronic Chagas disease

doi: 10.3389/fimmu.2026.1761769

Figure Lengend Snippet: Phenotypic analysis of T cells via multiparameter spectral flow cytometry in the colonic lamina propria during acute and chronic T. cruzi infection. C57BL/6 mice were infected with 10 4 T. cruzi (TcCol-Nluc). Colonic lamina propria cells were isolated from uninfected (Control), acutely infected (Acute, 30 dpi) and chronically infected (Chronic, 90 dpi) mice and analysed by flow cytometry using the gating strategy shown in Supplementary Figure 1 . (A) T cells composition by flow cytometry, (B) tSNE 2D map showing scaled expression of CD3, CD4, and CD8 cell makers (C) Heat map of T cells (CD45 + , CD3 + ) (highlighted clusters 1, 7, 9, 16, 20, 22). Arrows indicate immune cell clusters of inflammatory (purple) and regulatory (pink) double-negative (DN) T cells. (D) tSNE 2D map of DN T cells and percentage of T cells cluster for each group. Arrows indicate DN T cell clusters of inflammatory (purple) and regulatory (pink) cells. (E) Percentage of DN T cells with inflammatory/regulatory phenotypes in total immune cells (CD45 + cells). (F) Relative percentage of DN T cells with inflammatory/regulatory phenotypes in total DN T cells. Panel (D) shows auto-scaled cluster frequencies optimized for visualization within each group. For standardized quantitative comparison across groups, refer to the heat map in panel (C) . Bars in A represent mean ± SD, and individual symbols denote values from single mice (n = 15; 5 per set, 3 individual sets). Statistical comparisons were made by an unpaired t test: *p < 0.05, ****p < 0.0001.

Article Snippet: Antibodies were polyclonal goat IgG anti-mouse CD4 antibody (R&D Systems, MN), polyclonal rabbit IgG anti-mouse CD8 antibody (Novus Biologicals, CO), monoclonal Rat IgG2b Alexa Fluor ® 647 anti-mouse CD3 Antibody (BioLegend, CA), Donkey anti-Goat IgG (H+L) Cross-Adsorbed Secondary Antibody, Alexa FluorTM 488 (Thermo Fisher Scientific, CA), Donkey anti-Rabbit IgG (H+L) Highly Cross-Adsorbed Secondary Antibody, Alexa FluorTM 568 (Thermo Fisher Scientific, CA) ( ).

Techniques: Flow Cytometry, Infection, Isolation, Control, Expressing, Comparison

Journal: Frontiers in Immunology

Article Title: Double negative T cells (CD4 - /CD8 - ) are associated with Trypanosoma cruzi persistence in the mouse colon during chronic Chagas disease

doi: 10.3389/fimmu.2026.1761769

Figure Lengend Snippet: Double-negative T cells phenotypes in the colonic lamina propria of C57BL/6 mice during T. cruzi infection. C57BL/6 mice were infected with 10 4 T. cruzi (TcCol-Nluc). Mice were euthanized during the acute (30 dpi) and chronic (90 dpi) phases. Colonic lamina propria cells were isolated from uninfected (Control; blue), acutely infected (Acute; pink) and chronically infected (Chronic; green) mice. Cells were gated on single cells, live, CD45 + , CD3 + , CD4 - , CD8 - events and subsequently on (A) inflammatory immune cell markers including CCR5, CXCR3 or Granzyme B, and (B) regulatory immune cells markers including CCR4, IL10Rα or IL10. Bars represent mean ± SD, and individual symbols denote values from single mice (n = 8-12; 4 per set, 2–3 individual sets). Statistical comparisons were made by an unpaired t test: *p < 0.05, **p < 0.01, ***p < 0.001, **** p ≤ 0.0001.

Article Snippet: Antibodies were polyclonal goat IgG anti-mouse CD4 antibody (R&D Systems, MN), polyclonal rabbit IgG anti-mouse CD8 antibody (Novus Biologicals, CO), monoclonal Rat IgG2b Alexa Fluor ® 647 anti-mouse CD3 Antibody (BioLegend, CA), Donkey anti-Goat IgG (H+L) Cross-Adsorbed Secondary Antibody, Alexa FluorTM 488 (Thermo Fisher Scientific, CA), Donkey anti-Rabbit IgG (H+L) Highly Cross-Adsorbed Secondary Antibody, Alexa FluorTM 568 (Thermo Fisher Scientific, CA) ( ).

Techniques: Infection, Isolation, Control

Journal: Frontiers in Immunology

Article Title: Double negative T cells (CD4 - /CD8 - ) are associated with Trypanosoma cruzi persistence in the mouse colon during chronic Chagas disease

doi: 10.3389/fimmu.2026.1761769

Figure Lengend Snippet: Microscopy analysis of T. cruzi infected colons. C57BL/6 mice were infected with 10 4 T. cruzi (TcCol-Nluc-RFP). Colons were isolated from control and chronically infected mice (90 dpi), processed for microscopy and stained with CD3 (Blue), CD4 (Green) and CD8 (Red) specific antibodies ( Supplementary Table 1 , Antibody Panel 4) as described in the materials and methods. Immunofluorescence images of cross sections of colons obtained from non-infected mice (Control) and chronically infected mice (Chronic) are shown in panels (A, B) , respectively. In (A, B) , a low magnification image of the entire colon is shown in the upper left, a region of interest (ROI) 1 is shown at mid-magnification in the lower left, and a high magnification image of ROI 2 is shown in shown on the right. For ROI 2, an overlay image of the 3 channels CD3 (Blue), CD4 (Green) and CD8 (Red) is shown on the top right, and the individual channels are represented below as indicated. A representative result of 3 controls and 3 infected colons is shown in this figure. LP, Lamina Propria; solid white arrow heads, double-negative T cells (CD3 + , CD4 - , CD8 - ); open arrowheads, CD3 - , CD4 - , CD8 + cells; solid pink arrowheads, CD3 - , CD4 + , CD8 - cells; solid yellow arrowheads, CD3 - , CD4 + , CD8 + cells.

Article Snippet: Antibodies were polyclonal goat IgG anti-mouse CD4 antibody (R&D Systems, MN), polyclonal rabbit IgG anti-mouse CD8 antibody (Novus Biologicals, CO), monoclonal Rat IgG2b Alexa Fluor ® 647 anti-mouse CD3 Antibody (BioLegend, CA), Donkey anti-Goat IgG (H+L) Cross-Adsorbed Secondary Antibody, Alexa FluorTM 488 (Thermo Fisher Scientific, CA), Donkey anti-Rabbit IgG (H+L) Highly Cross-Adsorbed Secondary Antibody, Alexa FluorTM 568 (Thermo Fisher Scientific, CA) ( ).

Techniques: Microscopy, Infection, Isolation, Control, Staining, Immunofluorescence

Journal: Breast Cancer : Targets and Therapy

Article Title: The Correlation Between CD8+ Tumor-Infiltrating Lymphocytes and the Efficacy of Neoadjuvant Therapy in Breast Cancer

doi: 10.2147/BCTT.S533799

Figure Lengend Snippet: Immunohistochemistry slides of CD8+ TILs. ( A ) Baseline CD8+ TILs under ×200 magnification. Black arrows indicate iCD8+ TILs, and red arrows indicate sCD8+ TILs. Both intratumoral and stromal CD8+ TILs are diffusely distributed, with sCD8+ TILs being more abundant than iCD8+ TILs. ( B ) Baseline CD8+ TILs under ×400 magnification, showing positive staining of the cell membrane and cytoplasm (indicated by arrows).

Article Snippet: The CD8 rabbit anti-human polyclonal antibodies and secondary antibodies were sourced from Beijing Zhongshan Golden Bridge Biotechnology Co., Ltd., and the immunohistochemistry staining kit was procured from Fuzhou Maixin Biotechnology Development Co., Ltd. Formalin-fixed, paraffin-embedded tissue sections were prepared according to standard procedures, including sectioning, deparaffinization, and rehydration.

Techniques: Immunohistochemistry, Staining, Membrane

Journal: Biomolecules

Article Title: Human Mutant Dynactin Subunit 1 Causes Profound Motor Neuron Disease Consistent with Possible Mechanisms Involving Axonopathy, Mitochondriopathy, Protein Nitration, and T-Cell-Mediated Cytolysis

doi: 10.3390/biom15121637

Figure Lengend Snippet: T cells invade the spinal cord parenchyma of mutant-DCTN1 tg mice. ( A ) Localization of Fas-positive cells (thin arrows) in ventral horn of wildtype DCTN1 transgenic mouse. Scale bar (same for ( B )) = 40 µm. ( B ) Fas-positive cells (thin arrows) in the ventral horn of mutant DCTN1 tg mice appear more numerous than in wildtype tg mice. Inset is dashed square showing Fas-positive cells in the vicinity of a motor neuron. Inset scale bar = 12 µm. ( C ) Fas-positive cells (thin arrows) near degenerating motor neurons (asterisk) in mutant-DCTN1 mice. Scale bar = 7 µm. ( D ) Box plot showing the mean Fas-positive cell number (with IQR and 5–95 percentile whiskers, n = 6/group) in the ventral horn of age-matched non-tg, human wildtype DCTN1 (p150) and human mutant DCTN1 (p150) at 8 months of age. ( E ) Infiltrated CD8-positive cells (arrows) in the ventral horn of mutant DCTN1 mice. CD8 immunoreactivity is also present in the surrounding white matter (wm). Scale bar = 12 µm. ( F ) Focal accumulations of CD8 immunoreactivity were seen in the ventral root exit zones in the ventral funiculus of mutant DCTN1 mice. Scale bar = 15 µm.

Article Snippet: The sections were blocked and permeabilized (1 h) in 10% normal goat serum (NGS) with 0.4% Triton-x 100 and then incubated (4 °C) in primary IgG antibodies overnight: rabbit monoclonal anti-cleaved caspase-8 (1:500, D5B2), rabbit monoclonal anti-cleaved caspase-3 (1:4000, D3E9), rabbit polyclonal anti-SOD2 (1:2000), rabbit polyclonal anti-Parkin (1:500), rabbit polyclonal anti-mouse TNF-α (Chemicon, St. Louis, MO, USA, 1:500), rabbit monoclonal anti-IL9 (Abcam, Cambridge, MA, USA, 1:500), monoclonal anti-nitrated Hsp90 (1:1000), a mouse monoclonal anti-Fas (BD Transduction Laboratories, Franklin Lakes, NJ, USA, 1:500), and a rabbit polyclonal antibody to CD8 (Proteintech, 1:500).

Techniques: Mutagenesis, Transgenic Assay