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    Staining of GFAP and IBA1 in PDGFR-B/Td-tomato brain sections

    Daniel Manrique-Castano

    Published: 2023-09-01 DOI: 10.17504/protocols.io.14egn36mml5d/v1
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    Abstract

    This protocol is suitable for the staining of GFAP and IBA1 in PDGFR-B/Td-Tomato fixed mouse brain sections.

    Before start

    Steps

    Tissue preparation and blocking

    1.

    Take out sections from -80 and place them in an incubator/plate for 0h 20m 0s at 37°C. This step is performed to ensure tissue attachment to the crystal slides.

    2.
    1. Draw a hydrophobic barrier on each slide using ImmEdge®Hydrophobic Barrier PAP Pen ®Hydrophobic Barrier PAP Pen and let dry for about 0h 10m 0s minutes. This will prevent buffers from escaping the tissue area.

    Note
    There are other hydrophobic pens on the market. However, this one is recommended for its quality, consistency, and durability.

    3.

    To initially rehydrate and permeabilize the tissue, place the slides in a slide jar containing the permeabilization solution with shaking for 0h 30m 0s

    Note
    The proposed permeabilization solution contains glycine , which is suitable for reducing PFA-related autofluorescence, especially in the 488 channel.Antigen retrieval or any treatment with acid is not recommended given that it destroys the endogenous Td-tomato signal from PDGFR-B+ cells.
    .

    4.

    To prevent unspecific binding, incubate brain sections in permeabilization solution containing 5% (v/v) and 1Mass / % volume for 1h 0m 0s at Room temperature.

    Note
    Please note that blocking serum must be chosen according to secondary antibody species . For the procedure depicted in this protocol, all secondary antibodies are raised in donkey. However, goat secondary antibodies will also be suitable. Additionally, consider avoiding BSA when primary antibodies come from goat or sheep. BSA can generate unspecific background.

    Antibody incubation

    5.

    When blocking is finished, decant the buffer (no washing is required) and incubate primary antibodies in antibody buffer for 3h 0m 0s at Room temperature according to table 1 .

    ABCDE
    AntibodyCompanyReferenceSpecieDilution
    GfapInvitrogen13-0300Rat1:500
    Iba1Wako019-19741Rabbit1:500

    Table 1. Primary antibodies

    Note
    Please note that antibody buffers do not contain Triton X-100 . This detergent tends to break the hydrophobic barrier and the sections may not be adequately incubated. In addition, given that the sections are already permeabilized, we do not contemplate the use of this detergent.Please note that the proposed antibody incubation lasts only 3 hours . Although in most cases staining protocols recommend overnight incubation for primary antibodies, the tests performed in our lab showed better efficiency at room temperature. The indicated Iba1 antibody is superior to others available in the market.

    6.

    When primary antibody incubation is finished, wash the sections 0h 5m 0s with 0.05% (v/v) in PBS.

    7.

    Incubate secondary antibodies in 0.1% (v/v) for 1h 0m 0s at Room temperature according to table 2.

    ABCDE
    AntibodyCompanyReferenceChannelDilution
    Donkey anti-ratJackson712-605-1536471:500
    Donkey anti-rabbitInvitrogenA212064881:500
    DapiInvitrogenD3571405 (Dapi)1:5000

    Table 2. Secondary antibodies

    8.

    When secondary antibody incubation is finished, wash the sections 0h 5m 0s with 0.05% (v/v) in PBS. Follow this with 0h 5m 0s washes with PBS to remove all detergent traces.

    9.

    Clean the remaining buffer on the slides using absorbent tissue and mount the sections with a drop flo.

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