Dextran sulphate reduces diphenylhexatriene anisotropy in human peripheral blood lymphocytes: impact on plasma membrane fluidity and HIV-cytopathogenicity

1991 ◽  
Vol 28 (5) ◽  
pp. 677-680 ◽  
Author(s):  
Hans-Anton Lehr ◽  
Josef P. Zimmer ◽  
Christoph Hübner ◽  
Emil C. Reisinger ◽  
Alfried Kohlschütter ◽  
...  
Keyword(s):  
Plasma Membrane ◽  
Membrane Fluidity ◽  
Peripheral Blood ◽  
Human Peripheral Blood ◽  
Peripheral Blood Lymphocytes ◽  
Dextran Sulphate ◽  
Blood Lymphocytes ◽  
Plasma Membrane Fluidity ◽  
Human Peripheral Blood Lymphocytes

Identification of dopamine plasma membrane and vesicular transporters in human peripheral blood lymphocytes

2001 ◽  
Vol 117 (1-2) ◽  
pp. 133-142 ◽  
Author(s):  
Francesco Amenta ◽  
Elena Bronzetti ◽  
Franco Cantalamessa ◽  
Dahuk El-Assouad ◽  
Laura Felici ◽  
...  
Keyword(s):  
Plasma Membrane ◽  
Peripheral Blood ◽  
Human Peripheral Blood ◽  
Peripheral Blood Lymphocytes ◽  
Blood Lymphocytes ◽  
Human Peripheral Blood Lymphocytes ◽  
Vesicular Transporters

scholarly journals Protein phosphorylation in human peripheral blood lymphocytes. Phosphorylation of endogenous plasma membrane and cytoplasmic proteins

1979 ◽  
Vol 182 (2) ◽  
pp. 537-546 ◽  
Author(s):  
David D. Chaplin ◽  
H. James Wedner ◽  
Charles W. Parker
Keyword(s):  
Plasma Membrane ◽  
Cyclic Amp ◽  
Peripheral Blood ◽  
Human Peripheral Blood ◽  
Peripheral Blood Lymphocytes ◽  
Subcellular Fractions ◽  
Lymphocyte Function ◽  
Blood Lymphocytes ◽  
Human Peripheral Blood Lymphocytes ◽  
Cytoplasmic Proteins

Phosphorylation of endogenous proteins in subcellular fractions of human peripheral-blood lymphocytes was studied by one- and two-dimensional polyacrylamide-gel electrophoresis. Studies using extensively purified subcellular fractions indicated that the endogenous phosphorylating activity in the particulate fractions was derived primarily from the plasma membrane. Electrophoresis of 32P-labelled subcellular fractions in two dimensions [O'Farrell (1975) J. Biol. Chem.250, 4007–4021] provided much greater resolution of the endogenous phosphoproteins than electrophoresis in one dimension, facilitating their excision from gels for quantification of 32P content. More than 100 cytoplasmic and 20 plasma-membrane phosphorylated species were observed. Phosphorylation of more than 10 cytoplasmic proteins was absolutely dependent on cyclic AMP. In the plasma membrane, cyclic AMP-dependent phosphoproteins were observed with mol.wts. of 42000, 42000, 80000 and 90000 and pI values of 6.1, 6.3, 6.25 and 6.5 respectively. Phosphorylation of endogenous cytoplasmic and plasma-membrane proteins was rapid with t½=5–12s at 25°C. Between 40 and 70% of the 32P was recovered as phosphoserine and phosphothreonine when acid hydrolysates of isolated plasma-membrane phosphoproteins were analysed by high-voltage paper electrophoresis. The presence of cyclic AMP-dependent protein kinase and endogenous phosphate-acceptor proteins in the plasma membranes of lymphocytes provides a mechanism by which these cells might respond to plasma-membrane pools of cyclic AMP generated in response to stimulation by mitogens or physiological modulators of lymphocyte function.

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