Synthesis of proteins from ( sup 35 S)methionine by guinea pig megakaryocytes in vivo and time course of appearance of newly synthesized proteins in platelets

Journal Article · Sat Sep 01 00:00:00 EDT 1990 · Blood (Journal of Hematology); (USA)

OSTI ID:6511650

Schick, B P ^[1]

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1. Thomas Jefferson Univ., Philadelphia, PA (USA)

The relationship of protein synthesis to megakaryocyte maturation has been studied in guinea pigs in vivo. Guinea pigs were injected with a single dose of ({sup 35}S)methionine. Megakaryocytes and platelets were isolated daily for 4 days, and proteins from both cells were isolated by DEAE-Sephacel chromatography and analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and fluorography. All proteins in megakaryocytes corresponding to stained bands on the SDS-PAGE gels were radiolabeled at 3 hours after injection. The greatest loss of radioactivity from the megakaryocytes occurred between 1 and 3 days after injection. Only trace labeling of platelet proteins was seen at 3 hours, representing almost entirely three bands at molecular weights 47,000, 52,000, and 66,000. At 24 hours only about 13% of the maximal labeling was present, but not all proteins were labeled. The maximal labeling was at 3 days. The pattern of labeling of platelets at 3 days was identical to that of megakaryocytes at 3 hours. The protein pattern of nonmegakaryocytic marrow cells was different from that of the platelets and megakaryocytes. Data presented here suggest that most protein synthesis in megakaryocytes is completed at least 24 hours before release of the platelets to the circulation, and suggest some specificity in the proteins that are synthesized at the terminal stages of maturation.

• OSTI ID: 6511650
• Journal Information: Blood (Journal of Hematology); (USA), Vol. 76:5; ISSN 0006-4971
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
PROTEINS
BIOSYNTHESIS
AUTORADIOGRAPHY
BLOOD PLATELETS
CHROMATOGRAPHY
ELECTROPHORESIS
ERYTHROCYTES
GUINEA PIGS
IN VIVO
METHIONINE
MOLECULAR WEIGHT
SULFUR 35
AMINO ACIDS
ANIMALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOLOGICAL MATERIALS
BLOOD
BLOOD CELLS
BODY FLUIDS
CARBOXYLIC ACIDS
DAYS LIVING RADIOISOTOPES
DRUGS
EVEN-ODD NUCLEI
ISOTOPES
LIGHT NUCLEI
LIPOTROPIC FACTORS
MAMMALS
MATERIALS
NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
RADIOISOTOPES
RODENTS
SEPARATION PROCESSES
SULFUR ISOTOPES
SYNTHESIS
VERTEBRATES
550201* - Biochemistry- Tracer Techniques