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Sp 2002

Manufactured by Vector Laboratories
Sourced in United States

The SP-2002 is a high-performance spectrophotometer designed for a wide range of applications. It features a compact and robust design, providing accurate and reliable measurements across a broad wavelength range.

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10 protocols using sp 2002

1

Quantifying PCNA-Positive Cells in IPAH

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To assess in situ vascular cell proliferation in patients with IPAH, proliferating cell nuclear antigen (PCNA) staining was performed. Tissue sections were deparaffinized in toluene, treated with a graded series of ethanol washes, and rehydrated in PBS (Sigma Aldrich, St. Louis, MO, USA). Slides were then incubated for 30 min in a protein blocking solution (10% goat serum in PBS) and incubated for 1 h with an anti-PCNA mouse monoclonal antibody (M0879, clone PC-10, 1:200; Dako, Santa Clara, CA, USA) in the presence of streptavidin/biotin endogenous blocking reagents (SP-2002; Vector, Burlingame, USA). The slides were then incubated with a mouse biotinylated secondary antibody for 30 min, followed by amplification with the Vectastain ABC-AP Kit (AK-5002; Vector) for 30 min. The slides were then processed using the Vector Red Alkaline Phosphatase Substrate Kit (SK-5100; Vector).
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2

Immunostaining Procedure for Fluorescent Microscopy

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After a single wash with PBS, samples were fixed with 4% paraformaldehyde (153799, Aname) for 20 min at room temperature. Next, samples were washed twice with PBS and further blocked using Tris-buffered saline (TBS) with 6% donkey serum (S30, Millipore) and 1% Triton X-100 (T8787, Sigma) for 1 h at room temperature. Samples were then treated overnight at 4 °C with primary antibodies diluted in antibody dilution buffer consisting of TBS with 6% donkey serum and 0.5% Triton X-100. After three rinses with antibody dilution buffer, samples were treated for 4 h at room temperature with fluorescent-conjugated secondary antibodies (Alexa Fluor (A) 488-, Cy3- or A647-; 1:200). A previous blocking step with a streptavidin/biotin blocking kit (SP-2002, Vector Labs) was performed when samples were assayed for biotinylated LTL (B-1325, Vector Labs) and Alexa Fluor 488-conjugated streptavidin (SA5488, Vector Labs) was used to detect LTL+ cells. Nuclei were detected using 4,6-diamidino-2-phenylindole (DAPI; 1:5000, D1306, Life Technologies) for 30 min. For mounting, samples were immersed in Fluoromount-G (0100–01, Southern Biotech). Image acquisition was carried out using an SP5 Leica microscope or a Zeiss LSM780 confocal microscope. Primary antibodies and associated information are provided in Supplementary Table 5.
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3

Immunofluorescence Staining of Murine Spleen

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Cryosections (4μm) of spleens from Nr2f6+/+ and Nr2f6−/− immunized mice were fixed with 1% paraformaldehyde for 10 min at room temperature (RT). Slides were then blocked with 2% BSA/PBS for 30 min at RT, followed by incubation with mouse monoclonal antibodies against CD3 (eBioscience 17-0031-82, APC), B220 (eBioscience 12-0425-82, PE) and a biotin-labeled PNA (Vector Labs B-1085) for 45 min at RT. A kit for endogenous biotin and avidin blocking was used according to the manufacturer’s instructions (Vector Labs SP-2002). Subsequently, slides were incubated with streptavidin A488 (Invitrogen S32354) for 45 min at RT. After washing, slides were mounted with Diamond Antifade medium (Invitrogen P36965), images were acquired on a Leica DMi8 inverted microscope, and processed using Fiji software (Schindelin et al., 2012 (link)).
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4

Germinal Center Immunostaining in Frozen Mouse Spleen

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Spleens from immunized mice were frozen in optimal cutting temperature (OCT) compound (Tissue-Tek cryomold and OCT gel compound, Sakura Finetek USA, Torrance CA) and cryosectioned in 5μm slices. Cryosections were fixed in cold acetone for 10 min at −20°C, washed with PBS, and then solubilized in 0.5% Tween-20 in PBS. After further washing in PBS, endogenous biotin and streptavidin binding sites were blocked according to manufacturer’s instructions (SP-2002, Vector Laboratories, Burlingame CA). For germinal center detection, sections were sequentially incubated with the following primary antibodies for 30 min at RT: CD3-FITC (17A2, eBioscience, San Diego CA, 1:100); CD45R/B220 (RA3–6B2, BD, Franklin Lakes NJ, 1:200); peanut agglutinin-biotin (B-1075, Vector Laboratories, Burlingame CA, 1:100). Slides were washed with 0.1% Tween-20 in PBS, and then incubated with secondary antibodies for 30 min at room temperature (AF555-goat anti-rat IgG (Invitrogen, Carlsbad CA, 1:500); AF647-sAv (Invitrogen, Carlsbad CA, 1:200)). After washing, slides were mounted with Vectashield Mounting Medium (H-1000, Vector Laboratories, Burlingame CA). Images were acquired on a Zeiss LSM 700 Confocal Microscope (magnification 200x) and pictures processed using Zen (Zeiss, Oberkochen Germany) and QuPath software.
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5

Immunofluorescence Staining of Kidney Organoids

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Kidneys organoid and LTL+ cells were washed with PBS. Next samples were fixed with 4% paraformaldehyde (153799, Aname) for 20 min at room temperature. Specimens were washed twice with PBS and further blocked using Tris-buffered saline (TBS) with 6% donkey serum (S30, Millipore) and 1% Triton X-100 (T8787, Sigma) for 1h at room temperature. After three rinses with antibody dilution buffer, samples were treated for 4h at room temperature with fluorescent conjugated secondary antibodies (Alexa Fluor (A) Cy3- or A647-; 1:200). A previous blocking step with a streptavidin/biotin blocking kit (SP-2002, Vector Labs) was performed for biotinylated LTL (B-1325, Vector Labs) and Alexa Fluor 488-conjugated streptavidin (SA5488, VectorLabs) to detect LTL+ cells. Antibodies to NEPHRIN (R&D SYSTEMS 4269; 1:100) and LAMININ (Sigma L9393; 1:50), SGLT2 (Abcam AB37296; 1:100), NaKATPase (Abcam; AB209299; 1:200) and SLC3A1 (Sigma HPA038360; 1:50) were used overnight at 4°C diluted in antibody dilution buffer consisting of TBS with 6% donkey serum and 0.5% Triton X-100. Nuclei were detected using 4,6-diamidino-2-phenylindole (DAPI; 1:5000, D1306, Life Technologies) for 30min. For mounting, samples were immersed in Fluoromount-G (0100-01, Southern Biotech). Sample confocal images were acquired with an SP5 Leica microscope and LTL + were analyzed using ImageJ.
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6

Immunohistochemical Visualization of Glycoconjugates

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Coronal sections were washed three times for 10 minutes in PBST. For wisteria floribunda agglutinin (WFA) staining, samples were first blocked using a biotin blocking kit (Vector Labs SP2002). Sections were then incubated in block (PBST +5% Normal Goat Serum (NGS)(Thermo PCN5000), +5% Normal Donkey Serum (NDS)(Sigma D9663)) for 1 hour and then incubated in primary antibody solution(PBST + 2.5% NGS and 2.5% NDS) overnight at 4 °C. Primary antibodies used were chicken anti-GFP (1:500 Abcam ab13970), mouse anti-CS-56 (1:200 Sigma C8035), biotinylated WFA (1:1000 Vector Labs B-1355). Sections were washed three times for 10 minutes in PBS and then incubated for 1 hour at RT in secondary antibody solution (0.5x blockPBST +2.5% NGS and 2.5% NDS). Secondary antibodies used were goat anti-chicken Alexa 488 (1:1000 Invitrogen A11039), 10 μM HTL646 (1:500), Streptavidin-cy3 (1:1000 Jackson Immuno Research 016-160-084) and Hoescht 33343 (1:10K Invitrogen H3570). sections were washed three times for 10 minutes in PBS, and then placed on slides. Sections were mounted with flouromount gold and coverslips (TedPella 260152) and left to dry overnight at RT and stored at −20 °C.
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7

Immunofluorescent Staining of Murine Spleen

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Cryosections (4μm) of spleens from Nr2f6+/+ and Nr2f6−/− immunized mice were fixed with 1% paraformaldehyde for 10 min at room temperature (RT). Slides were then blocked with 2% BSA/PBS for 30 min at RT, followed by incubation with mouse monoclonal antibodies against CD3 (eBioscience 17-0031-82, APC), B220 (eBioscience 12-0425-82, PE) and a biotin-labeled PNA (Vector Labs B-1085) for 45 min at RT. A kit for endogenous biotin and avidin blocking was used according to the manufacturer’s instructions (Vector Labs SP-2002). Subsequently, slides were incubated with streptavidin A488 (Invitrogen S32354) for 45 min at RT. After washing, slides were mounted with Diamond Antifade medium (Invitrogen P36965), images were acquired on a Leica DMi8 inverted microscope, and processed using Fiji software (Schindelin et al., 2012 (link)).
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8

Immunostaining of Human Islet and Mouse Pancreas

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Human pseudo islets were fixed for 1 h at 4 °C and embedded in collagen (Wako Chemicals), mouse pancreata were fixed in 4% paraformaldehyde overnight at 4 °C. Ten µm-thick frozen sections were cut and stained following standard cryostaining protocols. Briefly, sections were washed in PBS, incubated with blocking solution (Vector Labs, SP-2002) at room temperature, followed by incubation in permeabilization/blocking buffer (1% bovine serum albumin, 0.2% non-fat milk, 0.5% Triton-X in PBS) for 1 h. Primary antibodies were mixed with permeabilization/blocking buffer at appropriate concentrations and slides were incubated at 4 °C overnight. The following primary antibodies were used: Guinea pig anti-Insulin, (1:1000, DAKO, A0564), rabbit anti-BCL11A (1:1000, Bethyl Laboratories, A300–380), mouse anti-mCherry (1:500, Abcam, ab125096), goat anti-Glut2 (1:300, Santa Cruz Biotechnology, sc-7580). Slides were washed with PBS, incubated with secondary antibodies at room temperature for 2 h. Following the final wash with PBS, slides were preserved with mounting medium containing DAPI (Vector Labs, Vectashield H-1200). Images were obtained using a Leica SP2 confocal microscope.
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9

Multiplex Immunohistochemistry Staining Protocol

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Tissues were treated with the epitope retrieval protocol. Samples to be treated with a cocktail containing a biotinylated secondary were incubated with a streptavidin and biotin blocking solution (Vector Laboratories; Catalog No SP-2002). All tissues were blocked with Serum-Free Protein Block for 30 min. Samples were subsequently incubated in a cocktail mixture of primary antibody solution for 60 min then rinsed with ImmunoWash. A cocktail mixture of secondary antibodies against the primary antibody host species was applied to the tissues for 30 min. The secondary antibodies (Supplementary Table 2) that were used in the study include the following: donkey anti-rabbit (Thermo Fisher Scientific; Catalog No: A21206, Dilution: 1:1000), horse anti-rabbit (Vector Laboratories; Catalog No: DI-1088, Dilution: 1:300), biotinylated donkey anti-mouse (Thermo Fisher Scientific; Catalog No: A16021, Dilution: 1:500), biotinylated horse anti-mouse (Vector Laboratories; Catalog No: BA-2001, Dilution: 1:75), biotinylated donkey anti-rat (Novus Biologicals; Catalog No: NBP1-75379, Dilution 1:500), and biotinylated donkey anti-goat (Thermo Fisher Scientific; Catalog No: A16009, Dilution: 1:500). This was followed by an incubation with a streptavidin conjugate for 30 min. Slides were counterstained with DAPI.
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10

Germinal Center Detection in Immunized Mouse Spleens

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Spleens from immunized mice were froZen in optimal cutting temperature (OCT) compound (Tissue-Tek cryomold and OCT gel compound, Sakura Finetek USA, Torrance CA) and cryosectioned in 5μm slices. Cryosections were fixed in cold acetone for 10 min at -20°C, washed with PBS, and then solubilized in 0.5% Tween-20 in PBS. After further washing in PBS, endogenous biotin and streptavidin binding sites were blocked according to manufacturer's instructions (SP-2002, Vector Laboratories, Burlingame CA). For germinal center detection, sections were sequentially incubated with the following primary antibodies for 30 min at RT: CD3-FITC (17A2, eBioscience, San Diego CA, 1:100); CD45R/B220 (RA3-6B2, BD, Franklin Lakes NJ, 1:200); peanut agglutinin-biotin (B-1075, Vector Laboratories, Burlingame CA, 1:100). Slides were washed with 0.1% Tween-20 in PBS, and then incubated with secondary antibodies for 30 min at room temperature (AF555-goat anti-rat IgG (Invitrogen, Carlsbad CA, 1:500); AF647-sAv (Invitrogen, Carlsbad CA, 1:200)). After washing, slides were mounted with Vectashield Mounting Medium (H-1000, Vector Laboratories, Burlingame CA). Images were acquired on a Zeiss LSM 700 Confocal Microscope (magnification 200x) and pictures processed using Zen (Zeiss, Oberkochen Germany) and QuPath software.
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