Differential Effects of Growth Hormone and Hydrocortisone on Nuclear RNA Synthesis in Rat Liver

1971 ◽  
Vol 49 (7) ◽  
pp. 853-862 ◽  
Author(s):  
Peter M. K. Ip ◽  
Maurice Brossard
Keyword(s):  
Growth Hormone ◽  
Rat Liver ◽  
Rna Synthesis ◽  
Present Report ◽  
Liver Nucleus ◽  
Double Labeling ◽  
Nuclear Rna Synthesis ◽  
Nuclear Rna ◽  
Liver Nuclei ◽  
Nucleolar Rna

RNA has been isolated and fractionated from rat liver nuclei by a sequence of salt extractions into four subfractions: namely nucleoplasmic, deoxyribonucleoprotein-associated, ribonucleoprotein-associated, and nucleolar fractions.Study of 14C-methyl-methionine labeling indicates that the nucleolar RNA fraction isolated by the present procedure is, in fact, of nucleolar origin while the other three fractions are essentially of extranucleolar origin.The effects of growth hormone and hydrocortisone on the nuclear RNA synthesis have been further studied using the present isolation and double-labeling techniques. Both hormones cause an increase in the incorporation of labeled orotic acid into all types of RNA in all four nuclear subfractions. However, the stimulatory effect of growth hormone is found mainly in the 18–28 S and 45–60 S regions of the nucleolar fraction and in regions of the entire gradient of the nucleoplasmic fraction, whereas the stimulatory effect of hydrocortisone is localized mainly in the 10–28 S regions of the nucleolar fraction and in the 4 S and 10–18 S regions of the ribonucleoprotein fraction.The present report suggests that there are qualitative as well as quantitative differences in the action of growth hormone and hydrocortisone on the synthesis of RNA in liver nucleus. The mode of action of the two hormones is discussed.

Zn2+ -Induced stimulation of nuclear RNA synthesis in rat liver

FEBS Letters ◽  
1970 ◽  
Vol 7 (4) ◽  
pp. 356-358 ◽  
Author(s):  
U. Weser ◽  
L. Hübner ◽  
H. Jung
Keyword(s):  
Rat Liver ◽  
Rna Synthesis ◽  
Nuclear Rna Synthesis ◽  
Nuclear Rna ◽  
Stimulation Of

scholarly journals Influence of steroid-hormone-receptor-protein complexes on initiation of ribonucleic acid synthesis in liver nuclei isolated from rats of various ages

1981 ◽  
Vol 196 (1) ◽  
pp. 373-375 ◽  
Author(s):  
J K Miller ◽  
R Bolla
Keyword(s):  
Rna Synthesis ◽  
Protein Complexes ◽  
Acid Synthesis ◽  
Receptor Protein ◽  
Steroid Hormone Receptor ◽  
Nuclear Rna Synthesis ◽  
Age Related ◽  
Nuclear Rna ◽  
Liver Nuclei ◽  
Effect Of Age

The effect of age on the induction of the initiation of RNA synthesis was investigated in liver nuclei isolated from adrenalectomized rats of various ages after binding of a dexamethasone-receptor-protein complex. Binding of this complex to nuclear chromatin resulted in increased initiation of nuclear RNA synthesis at all ages; however, an age-associated decline in the extent of this induction was observed. This suggests an age-related decrease of total rat liver nuclear RNA synthesis with a decreased response to glucocorticoid hormones.

Effect of growth hormone and hydrocortisone on the synthesis of rapidly labeled, high molecular weight, nuclear RNA in rat liver

1969 ◽  
Vol 47 (2) ◽  
pp. 226-229 ◽  
Author(s):  
Maurice Brossard ◽  
Louis Nicole
Keyword(s):  
Molecular Weight ◽  
Growth Hormone ◽  
High Molecular Weight ◽  
Rat Liver ◽  
Orotic Acid ◽  
The Other ◽  
Other Hand ◽  
Nuclear Rna ◽  
Nucleolar Rna

The effects of growth hormone and hydrocortisone on the synthesis of rat liver RNA have been studied. Administration of growth hormone stimulated the incorporation of 14C-orotic acid into 45 S preribosomal nucleolar RNA, and had no effect on the 6–50 S polydisperse nuclear RNA of extra-nucleolar origin. On the other hand, hydrocortisone stimulated the synthesis of all types of nuclear RNA, but mainly that of the 18 S class of 6–50 S polydisperse nuclear RNA.

THE NUCLEAR RNA-SYNTHESIS IN THE ANTERIOR PITUITARY OF RATS

1965 ◽  
Vol 49 (3_Suppl) ◽  
pp. S160 ◽  
Author(s):  
E. Stöcker ◽  
G. Dhom
Keyword(s):  
Anterior Pituitary ◽  
Rna Synthesis ◽  
Nuclear Rna Synthesis ◽  
Nuclear Rna

scholarly journals INHIBITING EFFECT OF THE NEW CYTOTOXIC ANTIBIOTIC DAUNOMYCIN ON NUCLEIC ACIDS AND MITOTIC ACTIVITY OF HELA CELLS

1965 ◽  
Vol 27 (3) ◽  
pp. 545-550 ◽  
Author(s):  
A. Di Marco ◽  
R. Silvestrini ◽  
S. Di Marco ◽  
T. Dasdia
Keyword(s):  
Mitotic Activity ◽  
Rna Synthesis ◽  
Thymidine Incorporation ◽  
Acid Synthesis ◽  
Acetyl Derivative ◽  
Total Inhibition ◽  
Nuclear Rna ◽  
Nucleolar Rna ◽  
Higher Doses

The effect has been studied of Actinomycin D, Daunomycin (Da.), and Da. N acetyl derivative on mitotic activity and on the nucleic acid synthesis of in vitro HeLa cell cultures. The experiments were carried out by means of the radioautographic technique using stripping films. The relative uptake of thymidine-H3 and uridine-H3 was determined by means of the reduced silver grain count present in the nuclei of controls and treated cells. The mitotic activity and thymidine incorporation were noticeably reduced by Daunomycin and Actinomycin, whereas both processes appeared less affected by Da. N acetyl derivative. As regards nuclear RNA synthesis, all three antibiotics at low doses chiefly inhibit nucleolar RNA synthesis. On the other hand, whilst Actinomycin at higher doses causes an almost total inhibition of the synthesis of the whole nuclear RNA, in Daunomycin- and Da. N acetyl derivative-treated cells extranucleolar RNA synthesis is less susceptible to inhibition.

scholarly journals ELECTRON MICROSCOPIC EXAMINATION OF THE SITES OF NUCLEAR RNA SYNTHESIS DURING AMPHIBIAN EMBRYOGENESIS

1965 ◽  
Vol 26 (3) ◽  
pp. 937-958 ◽  
Author(s):  
Shuichi Karasaki
Keyword(s):  
Rna Synthesis ◽  
Developmental Stages ◽  
Early Embryo ◽  
Tail Bud ◽  
Electron Microscopic ◽  
Electron Microscopic Autoradiography ◽  
Nuclear Rna Synthesis ◽  
Nuclear Rna ◽  
Chromatin Material ◽  
Labeled Rna

The site of H3-uridine incorporation and the fate of labeled RNA during early embryo-genesis of the newt Triturus pyrrhogaster were studied with electron microscopic autoradiography. Isolated ectodermal and mesodermal tissues from the embryos were treated in H3-uridine for 3 hours and cultured in cold solution for various periods before fixation with OsO4 and embedding in Epon. At the blastula stage, the only structural component of the nucleus seen in electron micrographs is a mass of chromatin fibrils. At the early gastrula stage, the primary nucleoli originate as small dense fibrous bodies within the chromatin material. These dense fibrous nucleoli enlarge during successive developmental stages by the acquisition of granular components 150 A in diameter, which form a layer around them. Simultaneously larger granules (300 to 500 A) appear in the chromatin, and they fill the interchromatin spaces by the tail bud stage. Autoradiographic examination has demonstrated that nuclear RNA synthesis takes place in both the nucleolus and the chromatin, with the former consistently showing more label per unit area than the latter. When changes in the distribution pattern of radioactivity were studied 3 to 24 hours after immersion in isotope at each developmental stage, the following results were obtained. Labeled RNA is first localized in the fibrous region of the nucleolus and in the peripheral region of chromatin material. After longer culture in non-radioactive medium, labeled materials also appear in the granular region of the nucleolus and in the interchromatin areas. Further incubation gives labeling in cytoplasm.

RNA synthesis in intact rat liver nuclei

1967 ◽  
Vol 120 (1) ◽  
pp. 136-157 ◽  
Author(s):  
Ronal R. MacGregor ◽  
H.R. Mahler
Keyword(s):  
Rat Liver ◽  
Rna Synthesis ◽  
Rat Liver Nuclei ◽  
Liver Nuclei
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