scholarly journals RNA synthesis in the ultrastructural and biochemical components of the nucleolus of Chinese hamster ovary cells.

1975 ◽  
Vol 66 (3) ◽  
pp. 577-585 ◽  
Author(s):  
A Royal ◽  
R Simard
Keyword(s):  
Chinese Hamster Ovary ◽  
Rna Synthesis ◽  
Biochemical Study ◽  
Chinese Hamster Ovary Cells ◽  
Chinese Hamster ◽  
Ovary Cells ◽  
Rna Molecules ◽  
Biochemical Components ◽  
Rapid Labeling ◽  
Fibrillar Region

A correlated autoradiographic and biochemical study of RNA synthesis in the nucleoli of chinese hamster ovary cells has been made. Quantitative analysis of the labeling indicates that the fibrillar ribonucleoprotein (RNP) component is labeled faster than 80S RNP and 45S RNA molecules, but approaches simultaneously a steady-state 3H to 14C ratio or grains/mum2 after 30 min of [3H]uridine incorporation. On the other hand, the 55S RNP, the 36S + 32S RNA, and the granular RNP components have the same kinetic of labeling with [3H]uridine. These results suggest that the fibrillar and granular RNP components of the nucleolus are the ultrastructural substratum of, respectively, the 80S RNP (45S RNA) and 55S RNP (36S + 32S RNA). The possibility that precursors to 80S RNP exist also in the fibrillar region of the nucleolus is strongly suggested by the rapid labeling of the fibrils on the autoradiographs.

scholarly journals Addition of poly(A) to nuclear RNA occurs soon after RNA synthesis.

1980 ◽  
Vol 86 (3) ◽  
pp. 844-848 ◽  
Author(s):  
M Salditt-Georgieff ◽  
M Harpold ◽  
S Sawicki ◽  
J Nevins ◽  
J E Darnell
Keyword(s):  
Chinese Hamster Ovary ◽  
Rna Synthesis ◽  
Chinese Hamster Ovary Cells ◽  
Chinese Hamster ◽  
Rna Sequences ◽  
Ovary Cells ◽  
Different Types ◽  
Nuclear Rna ◽  
Specific Mrnas ◽  
Chain Synthesis

A kinetic analysis of the appearance of [3H]uridine label in RNA sequences that neighbor poly(A), as well as the incorporation of [3H]adenosine label into both the RNA chain and the poly(A) of poly(A)-containing molecules, shows that poly(A) is added within a minute or so after RNA chain synthesis in Chinese hamster ovary cells and HeLa cells. Previous conclusions by several groups (5-7) that poly(A) might be added as long as 20-30 min after RNA synthesis appear to be in error, and the present conclusion seems much more in line with several different types of recent studies with specific mRNAs that suggest prompt poly(A) addition (13-16).

scholarly journals THE ACTION OF α-AMANITIN ON RNA SYNTHESIS IN CHINESE HAMSTER OVARY CELLS

1974 ◽  
Vol 63 (3) ◽  
pp. 831-842 ◽  
Author(s):  
Claude Kedinger ◽  
Rene Simard
Keyword(s):  
Chinese Hamster Ovary ◽  
Cho Cells ◽  
Mouse Liver ◽  
Rna Synthesis ◽  
Chinese Hamster Ovary Cells ◽  
Chinese Hamster ◽  
Ovary Cells ◽  
Drug Leads ◽  
Nucleolar Rna

α-Amanitin acts in vitro as a selective inhibitor of the nucleoplasmic form B RNA polymerases. Treatment of Chinese hamster ovary (CHO) cells with this drug leads principally to a severe fragmentation of the nucleoli. While the ultrastructural lesions induced by α-amanitin in CHO cells and in rat or mouse liver are quite similar, the results diverge concerning the effect on RNA synthesis. It has been shown that in rat or mouse liver α-amanitin blocks both extranucleolar and nucleolar RNA synthesis. Our autoradiographic and biochemical evidence indicates that in CHO cells high molecular weight extranucleolar RNA synthesis (HnRNA) is blocked by the α-amanitin treatment, whereas nucleolar RNA (preribosomal RNA) synthesis remains unaffected even several hours after the inhibition of extranucleolar RNA synthesis. Furthermore, the processing of this RNA as well as its transport to the cytoplasm seem only slightly affected by the treatment. Finally, under these conditions, the synthesis of the low molecular RNA species (4–5S) still occurs, though less actively. The results are interpreted as evidence for a selective impairment of HnRNA synthesis by α-amanitin in CHO cells.

Malignancy-related characteristics of wild type and drug-resistant chinese hamster ovary cells

Pathology ◽  
1993 ◽  
Vol 25 (3) ◽  
pp. 268-276 ◽  
Author(s):  
Wanda B. Mackinnon ◽  
Marlen Dyne ◽  
Rebecca Hancock ◽  
Carolyn E. Mountford ◽  
Adrienne J. Grant ◽  
...  
Keyword(s):  
Chinese Hamster Ovary ◽  
Chinese Hamster Ovary Cells ◽  
Chinese Hamster ◽  
Drug Resistant ◽  
Wild Type ◽  
Ovary Cells

Review of the current methods of Chinese Hamster Ovary (CHO) cells cultivation for production of therapeutic protein

2020 ◽  
Vol 17 ◽  
Author(s):  
Shazid Md. Sharker ◽  
Md. Atiqur Rahman
Keyword(s):  
Chinese Hamster Ovary ◽  
Cho Cells ◽  
Mass Production ◽  
Chinese Hamster Ovary Cells ◽  
Chinese Hamster ◽  
Therapeutic Protein ◽  
Specific Productivity ◽  
Ovary Cells ◽  
Further Development ◽  
Interesting Area

Most of clinical approved protein-based drugs or under in clinical trial have a profound impact in the treatment of critical diseases. The mammalian eukaryotic cells culture approaches, particularly the CHO (Chinese Hamster Ovary) cells are mainly used in the biopharmaceutical industry for the mass-production of therapeutic protein. Recent advances in CHO cell bioprocessing to yield recombinant proteins and monoclonal antibodies have enabled the expression of quality protein. The developments of cell lines are possible to upgrade specific productivity. As a result, it holds an interesting area for academic as well as industrial researchers around the world. This review will concentrate on the recent progress of the mammalian CHO cells culture technology and the future scope of further development for the mass-production of protein therapeutics.

Sign in / Sign up

Export Citation Format

Share Document