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Countess automated cell counter hemocytometer c10227

Manufactured by Thermo Fisher Scientific

The Countess Automated Cell Counter Hemocytometer C10227 is a compact and easy-to-use device designed for automated cell counting. It utilizes digital image processing technology to provide accurate and reproducible cell counts. The instrument is capable of analyzing a variety of cell types, including mammalian, yeast, and bacterial cells.

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7 protocols using countess automated cell counter hemocytometer c10227

1

Lung Cell Dissociation and CD45+ Enrichment

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Lung cells were dissociated as previously described (Sharma et al., 2022 (link)). The right lung was dissociated to a single cell suspension with Multi Tissue Dissociation Kit 2 (130–110–203, Miltenyi) according to the manufacturer’s protocol using the gentle MACS Dissociator (Miltenyi). The cell suspension was filtered through a 70 μm strainer, pelleted by centrifugation, and cleared of red blood cells with ACK Red Blood Cell Lysis buffer (BP10-548E, Lonza). Live cells were enumerated using trypan blue exclusion counting on a Countess Automated Cell Counter Hemocytometer C10227 (Invitrogen). Lung cells were then used as described below for Fluorescence-Activated Cell Sorting (FACS) analysis. Additionally, ten million lung cells per animal were used for CD45+ enrichment using the CD45 MicroBeads kit (cat# 130–109–682, Miltenyi) per manufacturer’s instructions.
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2

Tumor Dissociation and CD44+ Cell Isolation

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At the 28 day endpoint, tumors were carefully dissected and cut in half lengthwise. One half of the tumor was preserved in 10% buffered formalin for subsequent histology analysis. The remaining tumor was diced into 3 mm segments using a razor blade. The tumor was then digested according to the Miltenyi Tumor dissociation kit (130-095-9291) protocol in a Miltenyi gentleMACS C tube using the Miltenyi gentleMACS tissue dissociator. Cellular debris was removed from the dissociated cell suspension using Debris Removal Solution (Miltenyi 130-109-398). Live cells were enumerated using trypan blue dye on Countess Automated Cell Counter Hemocytometer C10227 (Invitrogen). Human CD44 tumor cells were isolated by magnetic column purification (Miltenyi, 130-095-194) per the manufacturer’s protocol.
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3

Lung Cell Isolation and Characterization

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The four lobes of the right lung were collected, washed in 1XPBS, and weighed. The lobes were then dissociated to a single cell suspension with Multi Tissue Dissociation Kit 2 (130-110-203, Miltenyi) according to the manufacturer’s protocol using the gentle MACS Dissociator (Miltenyi). The cell suspension was filtered through a 70 μm strainer, pelleted by centrifugation, and cleared of red blood cells with ACK Red Blood Cell Lysis buffer (BP10-548E, Lonza). Live cells were enumerated using trypan blue exclusion counting on a Countess Automated Cell Counter Hemocytometer C10227 (Invitrogen). Lung cells were then used as described below for Fluorescence-Activated Cell Sorting (FACS) analysis. Additionally, ten million lung cells per animal were used for CD45+ enrichment using the CD45 MicroBeads kit (cat# 130-109-682, Miltenyi) per manufacturer’s instructions.
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4

Allogeneic Bone Marrow Transplant in Rats

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Three donor adult female WAG/RijCmcr rats (11–12 weeks old) were exposed to 7.75 Gy total body irradiation (TBI) or sham irradiation. On day 30 post-irradiation, donor animals were humanely euthanized and both femurs were carefully excised. Bone marrow from individual femurs was flushed using a 28-gauge syringe into 5 ml of sterile phosphate buffered saline (PBS) containing 10% fetal bovine serum. Cells were pelleted by centrifugation and the red blood cell fraction was removed with (Ammonium Chloride Potassium) ACK lysis buffer. Total viable cells were determined using a Countess Automated Cell Counter Hemocytometer C10227 (Invitrogen) with trypan blue exclusion method. Adult female WAG/RijCmcr rats bone marrow recipients were conditioned with 13 Gy TBI. All rats were irradiated without the use of anesthetics by being placed in a plastic jig and the entire body was exposed using a XRAD 320 kV orthovoltage x-ray system (PrecisionX-Ray, Madison, CT). The X-ray system was operated at 320 kVp and13 mAs with a half-value layer of 1.4 mm copper and a dose rate of 169 cGy/min. Recipient rats received 5 × 106 whole bone marrow cells in a volume of 300 ul via intravenous tail vein injection at 24 h post-irradiation.
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5

Rat Bone Marrow Cell Isolation

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Bone marrow was harvested from the femurs of euthanized rats. Each femur was carefully excised from the animal and flushed with PBS containing 10% FBS and 1% Pen/Strep using a 1 ml syringe with a 25G needle, making sure to flush from both ends to ensure all cells were removed. Cells were pelleted by centrifugation and the red blood cell fraction was removed with ACK lysis buffer. Total viable cells were determined using a Countess Automated Cell Counter Hemocytometer C10227 (Invitrogen) with trypan blue exclusion method.
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6

Comprehensive Tumor Tissue Preparation

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Biopsy specimens were obtained fresh at the time of surgical resection or as part of a research-specific biopsy between February 27, 2022 and March 15, 2023. Samples were washed in PBS with 4% antibiotic-antimycotic (Gibco). The specimen was then split for multiple parallel analytic pathways. A piece was preserved in 10% buffered formalin for subsequent histologic analysis. The remaining tumor was diced into segments and separated for (1) immediate flow cytometry, (2) malignant cell culture, (3) TIL culture. The tumor piece for flow cytometry was then digested according to the Miltenyi Tumor dissociation kit protocol in a Miltenyi gentleMACS C tube using the Miltenyi gentleMACS tissue dissociator. Cellular debris was removed from the dissociated cell suspension using Debris Removal Solution (Miltenyi). Live cells were enumerated using trypan blue dye on Countess Automated Cell Counter Hemocytometer C10227 (Invitrogen).
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7

Isolating Rat Bone Marrow Cells

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Bone marrow was harvested from the femurs of euthanized rats. Each femur was carefully excised from the animal and flushed with PBS containing 10% FBS and 1% penicillin-streptomycin using a 1 ml syringe with a 25G needle, making sure to flush from both ends to ensure all cells were removed. Cells were pelleted by centrifugation and the red blood cell fraction was removed with ACK lysis buffer. Total viable cells were determined using a Countess Automated Cell Counter Hemocytometer C10227 (Invitrogen) with trypan blue exclusion.
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