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Biochemical and enzymatic characterization of thymic and splenic lymphocyte plasma membranes from inbred rats.
- Source :
-
Biochemistry [Biochemistry] 1975 Jul; Vol. 14 (13), pp. 3014-24. - Publication Year :
- 1975
-
Abstract
- Purified splenic and thymic lymphocytes from the ACI and F344 strains of inbred rats were disrupted by controlled hypotonic treatment, and their plasma membranes were prepared by sucrose density gradient centrifugation. The plasma membrane preparations were highly purified as judged by the structural appearance of the smooth membrane vesicles, by the 10- to 15-fold enrichment of 5'-nucleotidase, which cytochemically localized exclusively in the plasma membranes of intact lymphocytes, by the high cholesterol to phospholipid molar ratio (0.7-1.0), and by the very low specific activities of the enzymes associated predominantly with mitochondria, lysosomes, and endoplasmic reticulum. The protein and the lipid contents of the membranes were 48-55 and 37-48%, respectively. The total lipid content of plasma membranes was characteristically higher in thymic than splenic lymphocytes from both ACI and F344 strains. The specific activity of 5'-nucleotidase was similar in splenic lymphocyte membranes of the ACI strain, and in both the thymic and splenic lymphocyte membranes of the F344 strain. In contrast, the thymic lymphocyte membranes in the ACI strain showed half as much 5'-nucleotidase specific activity. Cytochemical results indicated that the 5'-nucleotidase is located on the outside surface of the lymphocyte plasma membranes.
- Subjects :
- Adenosine Monophosphate pharmacology
Animals
Cell Fractionation
Cell Membrane analysis
Cell Membrane enzymology
Cell Survival drug effects
Cholesterol analysis
Female
Lead pharmacology
Lymphocytes enzymology
Male
Methods
Nucleic Acids analysis
Phospholipids analysis
Proteins analysis
Rats
Rats, Inbred ACI
Rats, Inbred F344
Sex Factors
Sodium Chloride pharmacology
Spleen cytology
Thymus Gland cytology
Lymphocytes ultrastructure
Nucleotidases metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 0006-2960
- Volume :
- 14
- Issue :
- 13
- Database :
- MEDLINE
- Journal :
- Biochemistry
- Publication Type :
- Academic Journal
- Accession number :
- 1148189
- Full Text :
- https://doi.org/10.1021/bi00684a034