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7 protocols using dispase type 2

1

Culturing Cancer Cells and Neurons

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Cancer cells: The human oral squamous cell carcinoma cell lines, HSC-3 and Hela-O3, were cultured in Dulbecco’s Modification of Eagle’s Medium (DMEM) with 4.5 g/L glucose, l-glutamine and sodium pyruvate, supplemented with 10% fetal bovine serum (FBS), and cultured at 37 °C in 5% CO2. HSC-3 was purchased from ATCC and used fewer than 6 months after resuscitation. Hela-O3 was obtained from Dr. Roberto Weigert at the National Cancer Institute and tested for Mycoplasma by PCR (ATCC) prior to use.
Neurons: Mouse trigeminal ganglia were harvested and cultured as previously described26 (link). Trigeminal ganglia were isolated, transferred into Hank’s Balanced Salt Solution (HBSS) and enzyme-digested by incubation with papain (Worthington), collagenase type II (Worthington), and dispase type II (MB). Dissociated neurons were plated on glass coverslips coated with poly-d-lysine and laminin and maintained at 37 °C at 5% CO2/95% air in F12 media (Life Technologies) with 5% FBS.
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2

Isolation and Culture of Murine Trigeminal Ganglion Neurons

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Plates were coated with 20 μg/ml poly-D-Lysine (Sigma-Aldrich, St. Louis, United States) and 18 μg/ml Laminin (Sigma-Aldrich, St. Louis, United States) 1 day before neuron isolation, followed by overnight incubation at 4°C. As previously described (Katzenell et al., 2017 (link)), TGs were obtained from 6 weeks old C57B/6 mice and were digested first with 40 U/ml papain (Worthington, Lakewood, NJ, United States) in HBSS at 37°C for 20 min and then with 140 U/ml collagenase type II (Worthington, Lakewood, NJ, United States) and 0.4 U/ml dispase type II (Worthington, Lakewood, NJ, United States) in HBSS at 37°C for 20 min. Gradient separation was performed at 1300 × g for 10 min in the Percoll gradient (Sigma-Aldrich, St. Louis, United States), with slow acceleration and deceleration. Next, the isolated TG Neurons were inoculated onto a well-coated plate and incubated in Neurobasal-A Complete (NBA-C): Neurobasal A medium (Gibco, Grand Island, NY, United States) supplemented with 2% B-27 Supplements (Gibco, Grand Island, NY, United States), 1% GlutaMAX (Gibco, Grand Island, NY, United States). After 3–4 days of culture, the cells were used for follow-up experiments. A diagram of the process is shown in Figure 1.
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3

Acute Dissociation of Dorsal Root Ganglia Neurons

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Mouse spinal columns were removed and placed in ice-cold HBSS; neurons were acutely dissociated and maintained as described E3,4. In brief, laminectomies were performed and bilateral DRG were dissected out. After removal of connective tissues, DRG were transferred to a 1 mL Ca2+/Mg2+-free HBSS containing 2 μL saturated NaHCO3, 0.35 mg 1-cysteine and 20 U papain (Worthington, Lakewood, NJ, USA), and incubated at 37°C for 10 min. The suspension of DRG was centrifuged, the supernatant was removed, 1 mL Ca2+/Mg2+-free HBSS containing 4 mg collagenase type II and 1.25 mg dispase type II (Worthington) was added and incubated at 37°C for 10 min. After digestion, neurons were pelleted, suspended in neurobasal medium containing 2% B-27 supplement, 1% L-glutamine, l00 U·mL−1 penicillin plus 100 μg·mL−1 streptomycin, and 50 ng·mL−1 nerve growth factor, plated on a 12 mm coverslip coated with poly-L-lysine (10 μg·mL−1) and cultured under a humidified atmosphere of 5% CO2/95% air at 37°C for 18–24 hr before use.
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Acute Dissociation of Mouse DRG Neurons

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Mouse spinal columns were removed and placed in ice-cold HBSS; neurons were acutely dissociated and maintained as described.13 (link) In brief, laminectomies were performed and bilateral DRG were dissected out. After removal of connective tissues, DRG were transferred to a 1 mL Ca2+/Mg2+-free HBSS containing 2 μL saturated NaIICO3, 0.35 mg 1-cysteine and 20 U papain (Worthington, Lakewood, NJ, USA), and incubated at 37°C for 10 min. The suspension of DRG was centrifuged, the supernatant was removed, 1 mL Ca2+/Mg2+-free HBSS containing 4 mg collagenase type II and 1.25 mg dispase type II (Worthington) was added and incubated at 37°C for 10 min. After digestion, neurons were pelleted, suspended in neurobasal medium containing 2% B-27 supplement, 1% 1-glutamine, 100U·mL−1 penicillin plus 100μg·mL−1 streptomycin, and 50ng·mL−1 nerve growth factor, plated on a 12mm coverslip coated with poly-l-lysine (10 μg·mL−1) and cultured under a humidified atmosphere of 5% CO2/95% air at 37°C for 18–24 hr before use.
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5

Isolation and Culture of Mouse TG Neurons

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Mouse TG neurons were harvested and cultured as previously described [27 (link)]. Briefly, BALB/c mice were euthanized with isoflurane. Trigeminal ganglia were removed, transferred into HBSS and enzyme-digested by incubation with papain (Worthington), collagenase type II (CLS2) (Worthington), and dispase type II (MB). Dissociated neurons were plated on glass coverslips coated with poly-d-lysine and laminin and maintained for approximately 2 hr at 37°C at 5% CO2/95% air in F12 media (Gibco BRL) supplemented with 10% FBS.
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6

Isolation and Culture of Dorsal Root Ganglia Neurons

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Mice were killed by cervical dislocation following CO2 asphyxia and spinal columns were removed and placed in ice-cold HBSS. Laminectomies were performed and bilateral DRGs were dissected out. After removal of connective tissues, DRGs were digested in 1 mL of Ca2+/Mg2+-free HBSS containing 20 U of papain (Worthington, Lakewood, NJ), 0.35 mg of l-cysteine and 1 μL of saturated NaHCO3 and incubated at 37 °C for 10 min. The DRG suspension was centrifuged, the supernatant was removed, and 1 mL of Ca2+/Mg2+-free HBSS containing 4 mg of collagenase type II and 1.25 mg of Dispase type II (Worthington) was added and incubated at 37 °C for 15 min. After digestion, neurons were pelleted; suspended in neurobasal medium containing 1% l-glutamine, 2% B-27 supplement, 100 U mL−1 penicillin plus 100 μg mL−1 streptomycin, and 50 ng mL−1 nerve growth factor. The cells were plated on a 12-mm coverslip coated with poly-l-lysine (10 μg mL−1) and cultured under a humidified atmosphere of 5% CO2/95% air at 37 °C for 24 h.
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7

Culturing Dorsal Root Ganglion Neurons

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Dorsal root ganglion (DRG) neurons were primarily cultured, as described previously. Briefly, thoracic and lumbar DRGs were dissected and collected from adult mice and transferred into HBSS without Ca2+/Mg2+ on ice. F12 with 10% FCS and 100 U/ml penicillin/streptomycin was used as a culture medium. Ganglia were incubated with 1.5 mL papain (40 U/ml, Worthington) for 10 min at 37°C and then with 3 mL collagenase type II (4 mg/ml, Worthington)/ dispase type II (4.67 mg/ml, Worthington) combined solution for 10 min at 37°C. Dissociated cells were plated on poly-D-lysine-treated small coverslips and incubated for 2 to 3 days at 37°C in 95% air/5% CO2.
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