Cells were incubated with chloroquine for 2 hours before stimulation with lipopolysaccharide (LPS, 1g/ml). Cell viability was measured by staining cells with 3-(4,5-dimethylthiazol-2- yl)-2,5- diphenyltetrazolium bromide. TNF in the culture supernatant and the cell lysate were measured by sandwich ELISA, using specific monoclonal antibodies according to the manufacturer's instructions. To determine the level of cell-associated cytokines, cells were washed with phosphate-buffered saline (PBS) and lysed in a buffer containing 0.5% NP-40. Standard recombinant proteins were also diluted in PBS containing the same concentrations of NP-40 as the cell lysate. Cytokine synthesized were proteolytically cleaved and released into medium. The amount of cytokines in the culture supernatant and the cell lysate were presented. Results for TNF production are shown in Figure1 (Jang et al, 2006). (Cells : PBMC: Human peripheral blood mononuclear cells, monocytes, monocytic lymphoma U-937 and leukemia THP1 cells). PBMCS 30 O Medium Coll 20 10 Monocytos 15 10

Curren'S Math For Meds: Dosages & Sol
11th Edition
ISBN:9781305143531
Author:CURREN
Publisher:CURREN
Chapter16: Adult And Pediatric Dosages Based On Body Surface Area
Section: Chapter Questions
Problem 7.1P
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Cells were incubated with chloroquine for 2 hours before stimulation with lipopolysaccharide
(LPS, 1g/ml). Cell viability was measured by staining cells with 3-(4,5-dimethylthiazol-2-
yl)-2,5- diphenyltetrazolium bromide. TNF in the culture supernatant and the cell lysate were
measured by sandwich ELISA, using specific monoclonal antibodies according to the
manufacturer's instructions. To determine the level of cell-associated cytokines, cells
were washed with phosphate-buffered saline (PBS) and lysed in a buffer containing 0.5%
NP-40. Standard recombinant proteins were also diluted in PBS containing the same
concentrations of NP-40 as the cell lysate. Cytokine synthesized were proteolytically
cleaved and released into medium. The amount of cytokines in the culture supernatant and
the cell lysate were presented. Results for TNF production are shown in Figure1 (Jang et al,
2006). (Cells : PBMC: Human peripheral blood mononuclear cells, monocytes, monocytic
lymphoma U-937 and leukemia THP1 cells).
PBMCS
30
O Medium
Coll
20
10
Monocytos
15
10
U937
1.5
1.0
0.5
THP-1
1.0
0.5
LPS
100 100
25
50
Chloroquine (uM)
Figure 1
Explain the effects of chloroquine on TNF production in various cells shown in Figure 1.
Why are such effects observed?
(6u) INI
Transcribed Image Text:Cells were incubated with chloroquine for 2 hours before stimulation with lipopolysaccharide (LPS, 1g/ml). Cell viability was measured by staining cells with 3-(4,5-dimethylthiazol-2- yl)-2,5- diphenyltetrazolium bromide. TNF in the culture supernatant and the cell lysate were measured by sandwich ELISA, using specific monoclonal antibodies according to the manufacturer's instructions. To determine the level of cell-associated cytokines, cells were washed with phosphate-buffered saline (PBS) and lysed in a buffer containing 0.5% NP-40. Standard recombinant proteins were also diluted in PBS containing the same concentrations of NP-40 as the cell lysate. Cytokine synthesized were proteolytically cleaved and released into medium. The amount of cytokines in the culture supernatant and the cell lysate were presented. Results for TNF production are shown in Figure1 (Jang et al, 2006). (Cells : PBMC: Human peripheral blood mononuclear cells, monocytes, monocytic lymphoma U-937 and leukemia THP1 cells). PBMCS 30 O Medium Coll 20 10 Monocytos 15 10 U937 1.5 1.0 0.5 THP-1 1.0 0.5 LPS 100 100 25 50 Chloroquine (uM) Figure 1 Explain the effects of chloroquine on TNF production in various cells shown in Figure 1. Why are such effects observed? (6u) INI
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