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Wallac 1480

Manufactured by PerkinElmer

The Wallac 1480 is a compact and versatile liquid scintillation counter designed for accurate and reliable radioactivity detection. It features a high-performance photomultiplier tube and advanced signal processing technology to provide precise measurements of various radioisotopes. The Wallac 1480 is capable of performing a wide range of applications in research and clinical settings.

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4 protocols using wallac 1480

1

Specific Binding Assay of Melanoma-Targeting Radiotracers

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Specific binding of Al18F-NOTA-PEG2Nle-CycMSHhex (peak 1 and peak 2) and Al18F-NOTA-AocNle-CycMSHhex was determined on B16/F10 cells seeded on 24-well plates. The B16/F10 melanoma cells (1 × 106 cells per well, n = 3) were incubated at 25 °C for 1 h with approximately 11.1 KBq of each isomer of Al18F-NOTA-PEG2Nle-CycMSHhex and Al18F-NOTA-AocNle-CycMSHhex with or without 10 μg (6.07 nmol) of unlabeled [Nle4, D-Phe7]-α-MSH (NDP-MSH) in 0.3 mL of binding medium {Dulbecco’s modified Eagle’s medium with 25 mM N-(2-hydroxyethyl)-piperazine-N’-(2-ethanesulfonic acid), pH 7.4, 0.2% bovine serum albumin (BSA), 0.3 mM 1,10-phenathroline}. The binding medium was aspirated after incubation. The cells were washed twice with 0.5 mL of ice-cold 0.01 M phosphate buffered saline (PBS) buffer containing 0.2% BSA (pH = 7.4), and lysed with 0.5 mL of 1 M NaOH for 5 min, collected and measured in a Wallac 1480 automated gamma counter (PerkinElmer, NJ).
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2

MC1R Binding Affinity of NOTA/NODAGA-GGNle-CycMSHhex

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The MC1R binding affinities of NOTA/NODAGA-GGNle-CycMSHhex were determined on B16/F10 melanoma cells by in vitro competitive receptor binding assay. The receptor binding assay was replicated in triplicate. The B16/F10 cells (0.5×105 cells/well, n = 3) were incubated at room temperature (25 °C) for 2 h with approximately 30,000 counts per minute (cpm) of 125I-(Tyr2)-NDP-MSH in the presence of 10−12 to 10−5 M of the peptide in 0.3 mL of binding medium {Modified Eagle’s medium with 25 mM N-(2-hydroxyethyl)-piperazine-N’-(2-ethanesulfonic acid), pH 7.4, 0.2% bovine serum albumin (BSA), 0.3 mM 1,10-phenathroline}. The binding medium was aspirated after the incubation. The cells were rinsed twice with 0.5 mL of ice-cold pH 7.4, 0.2% BSA/0.01 M phosphate buffered saline (PBS) and lysed in 0.5 mL of 1 N NaOH for 5 min. The cells were harvested and measured in a Wallac 1480 automated gamma counter (PerkinElmer, NJ). The IC50 value was calculated using the Prism software (GraphPad Software, La Jolla, CA, USA).
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3

Melanoma Cell Binding of Radiolabeled MSH

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The specific binding of 68Ga-DOTA-GGNle-CycMSHhex was determined using B16/F10 and M21 melanoma cells. The B16/F10 and M21 cells (1×106 cells/tube, n = 3) were incubated at 37 °C for 2 h with approximately 0.037 MBq of 68Ga-DOTA-GGNle-CycMSHhex with or without 10 μg (6.07 nmol) of unlabeled NDP-MSH in 0.3 mL of binding medium [Modified Eagle’s medium with 25 mM N-(2-hydroxyethyl)-piperazine-N’-(2-ethanesulfonic acid), pH 7.4, 0.2% bovine serum albumin (BSA), 0.3 mM 1,10-phenathroline]. The binding medium was aspirated after the incubation. The cells were rinsed three times with 0.5 mL of ice-cold pH 7.4, 0.2% BSA/0.01 M phosphate buffered saline (PBS) and measured in a PerkinElmer Wallac 1480 automated γ-counter
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4

Melanoma Cell MC1R Binding Assay

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The MC1R binding affinities of DOTA-GGNle-CycMSHhex and Cy5.5-GGNle-CycMSHhex were determined on B16/F10 and M21 melanoma cells by in vitro competitive receptor binding assay. The receptor binding assay was replicated in triplicate. B16/F10 and M21 cells (2×105 cells/well, n = 3) were seeded separately in 24-well cell culture plates and incubated at 37 °C overnight. After being washed with binding medium [Modified Eagle’s medium with 25 mM N-(2-hydroxyethyl)-piperazine-N′-(2-ethanesulfonic acid), pH 7.4, 0.2% bovine serum albumin (BSA), 0.3 mM 1,10-phenathroline], the cells were incubated at 37 °C for 2 h with approximately 45,000 counts per minute (cpm) of 125I-(Tyr2)-NDP-MSH in the presence of 10−12 to 10−5 M of the peptide in 0.3 mL of binding medium. The binding medium was aspirated after the incubation. The cells were rinsed twice with 0.5 mL of ice-cold pH 7.4, 0.2% BSA/0.01 M phosphate buffered saline (PBS) and lysed in 0.5 mL of 1 N NaOH for 5 min. The cells were harvested and measured in a PerkinElmer Wallac 1480 automated γ-counter. The IC50 value was calculated using Prism from GraphPad Software.
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