The abnormal morphology of polyoma-transformed baby hamster kidney cells is due to a failure to respond to 70K spreading factor

1982 ◽  
Vol 55 (1) ◽  
pp. 301-316
Author(s):  
P. Knox ◽  
S. Griffiths
Keyword(s):  
Serum Proteins ◽  
Culture Conditions ◽  
Kidney Cells ◽  
Baby Hamster Kidney ◽  
Tissue Culture Plastic ◽  
Spreading Factor ◽  
Bhk Cells ◽  
Low Concentrations ◽  
Two Peaks ◽  
Baby Hamster Kidney Cells

The typical elongated bipolar morphology of baby hamster kidney (BHK) cells is not shown by polyoma-transformed BHK (Py-BHK) cells. Instead, the transformed line adheres poorly to tissue-culture plastic and cells have a more rounded morphology than the parent line. Plasma fibronectin is known to mediate the spreading of BHK cells, but when human serum is subjected to Sephacryl S-300 chromatography two peaks of spreading activity are eluted; the first is fibronectin and the second, which is quantitatively more significant, is a 70 K protein that is not related to fibronectin and stimulates spreading by a different mechanism. Py-BHK cells spread well in low concentrations of purified fibronectin but will not spread well in levels of serum that contain similar or greater concentrations of fibronectin. This is because fibronectin-mediated spreading of both BHK and Py-BHK cells occurs only in the presence of low concentrations of other proteins; albumin and other serum proteins inhibit fibronectin-mediated spreading. BHK cells spread under routine culture conditions in response to the 70 K factor rather than fibronectin. The altered morphology that results from viral transformation is due to a failure of the cells to respond to the 70 K spreading factor.

scholarly journals Clonal growth of hamster free alveolar cells in soft agar.

1975 ◽  
Vol 142 (4) ◽  
pp. 877-886 ◽  
Author(s):  
H S Lin ◽  
C Kuhn ◽  
T Kuo
Keyword(s):  
Clonal Growth ◽  
Soft Agar ◽  
Culture Conditions ◽  
Mononuclear Phagocytes ◽  
Kidney Cells ◽  
Baby Hamster Kidney ◽  
Alveolar Cells ◽  
Bronchial Washing ◽  
Lag Period ◽  
Baby Hamster Kidney Cells

Free alveolar cells obtained from healthy unstimulated hamsters were tested for their ability to form colonies in soft agar. Every bronchial washing so far tested contained colon-forming cells. The average plating efficiency was 8.1% (2.4-18.3%). Alveolar colony-forming cells were characterized by having a long initial lag period (4-8 days) and only mononuclear phagocytes were found in the colony. Medium conditioned by baby hamster kidney cells or other cells was required for the initiation and maintenance of their growth. Alveolar cells from normal mice and rats also formed colonies under appropriate culture conditions.

scholarly journals A comparison of polyamine metabolism in normal and transformed baby-hamster-kidney cells

1982 ◽  
Vol 202 (3) ◽  
pp. 785-790 ◽  
Author(s):  
H M Wallace ◽  
H M Keir
Keyword(s):  
Culture Conditions ◽  
Polyamine Metabolism ◽  
Transformed Cells ◽  
Kidney Cells ◽  
Baby Hamster Kidney ◽  
Normal Cells ◽  
The Difference ◽  
Cell Densities ◽  
Altered Transport ◽  
Baby Hamster Kidney Cells

Transformed baby-hamster-kidney cells contain higher intracellular concentrations of polyamines than do normal cells. The difference is greater in high-density confluent cultures. Transformed cells incorporate exogenous putrescine into the cells at a faster rate than do normal cells. They also show a marked increase in the rate of spermine biosynthesis compared with normal cells. Transformed cells grown to high cell densities released about 10% of their polyamines into the culture medium in a non-specific manner. In contrast, normal cells, under the same culture conditions, release up to 50% of their intracellular polyamines into the medium almost exclusively as free or conjugated spermidine. The elevated levels of polyamines found in transformed cells therefore appear to be the result of altered transport of polyamines across the cell membrane and of increased rates of biosynthesis.

The effect of cortisol on glycogen and fructose-1, 6-bisphosphatase in baby hamster kidney cells infected with Chlamydia trachomatis

1980 ◽  
Vol 26 (2) ◽  
pp. 135-140 ◽  
Author(s):  
Stella I. Reed ◽  
William D. Hann
Keyword(s):  
Chlamydia Trachomatis ◽  
Host Cell ◽  
Glycogen Synthesis ◽  
Kidney Cells ◽  
Baby Hamster Kidney ◽  
Bhk Cells ◽  
Intracellular Environment ◽  
Infected Cells ◽  
Baby Hamster Kidney Cells ◽  
In Cells

This study was designed to assay changes in glycogen synthesis which may occur as a result of cortisol treatment of chlamydial-infected cells. Monolayers of baby hamster kidney (BHK) cells, unlabeled and prelabeled with [6-14C]glucose, were treated with various concentrations of cortisol before (pretreated) or during (post-treated) infection with Chlamydia trachomatis. At designated times after absorption, the cells were harvested and assayed for total glycogen and 14C accumulation in glycogen. The total amount of glycogen accumulated in cells during the period of greatest chlamydial glycogen synthesis (36 h) was not affected by cortisol treatment. Cortisol treatment appeared to have retarded the accumulation of glycogen in treated infected cells until 30 h after infection. Treated infected cells prelabeled with [6-14C]glucose accumulated a greater amount of 14C in glycogen than untreated infected cells. All cortisol-treated, infected cells exhibited elevated levels of fructose-1, 6-bisphosphatase activity, whereas untreated infected cells did not. The hypothesis that cortisol affects chlamydia multiplication by altering the intracellular environment of the host cell is compatible with the results obtained.

Turbomolecular Pumped Electron Microscopy of Rubella Virus (In BHK Celis)

1968 ◽  
Vol 26 ◽  
pp. 204-205
Author(s):  
A. B. Taylor ◽  
G. C. Cole ◽  
M. A. Holcomb ◽  
C. A. Baechler
Keyword(s):  
Electron Microscopy ◽  
Rubella Virus ◽  
Phosphate Buffer ◽  
Fetal Calf Serum ◽  
Calf Serum ◽  
Basal Medium ◽  
Kidney Cells ◽  
Baby Hamster Kidney ◽  
Input Multiplicity ◽  
Baby Hamster Kidney Cells

An aliquot from a continuous fermenter culture of baby hamster kidney cells (BHK-21 Clone PD-4) (Wistar) maintained in Ca free Eagle's Basal Medium containing 2% Kaolin adsorbed fetal calf serum was planted in spinner flasks at 300,000 cells per ml, total volume 600 ml. After equilibration for one day at 35°C to insure that cells were in log phase, the culture was infected with the M-33-AGMK25 BHK-219 strain of rubella at an input multiplicity of about 6 TCID50 per cell. The virus was identified with specific rubella antiserum.Preliminary experiments had shown that such cultures would reach a peak or plateau HA titer of approximately 1:64, 24 hrs after inoculation and would continue to yield virus for 6 to 12 days. One hundred ml aliquot harvests were withdrawn daily and the culture was returned to volume with growth medium and incubation continued. The harvested cells were spun down rapidly at 2500 rpm per 15 mins., fixed in 3.7% gluteraldehyde in Ca free phosphate buffer saline, and post fixed in osmium tetraoxide. After dehydration, the cells were embedded in Epon 812 and cured approximately 20 hrs at 60°C.

scholarly journals Allicin from garlic strongly inhibits cysteine proteinases and cytopathic effects of Entamoeba histolytica.

1997 ◽  
Vol 41 (10) ◽  
pp. 2286-2288 ◽  
Author(s):  
S Ankri ◽  
T Miron ◽  
A Rabinkov ◽  
M Wilchek ◽  
D Mirelman
Keyword(s):  
Alcohol Dehydrogenase ◽  
Entamoeba Histolytica ◽  
Kidney Cells ◽  
Cysteine Proteinases ◽  
Baby Hamster Kidney ◽  
Important Contributor ◽  
Cytopathic Effects ◽  
Baby Hamster Kidney Cells

The ability of Entamoeba histolytica trophozoites to destroy monolayers of baby hamster kidney cells is inhibited by allicin, one of the active principles of garlic. Cysteine proteinases, an important contributor to amebic virulence, as well as alcohol dehydrogenase, are strongly inhibited by allicin.

scholarly journals Cytotoxicity of Pristine C<sub>60</sub> Fullerene on Baby Hamster Kidney Cells in Solution

2012 ◽  
Vol 03 (03) ◽  
pp. 385-390 ◽  
Author(s):  
Shufang Liu ◽  
Haijie Liu ◽  
Zhijuan Yin ◽  
Kai Guo ◽  
Xibao Gao
Keyword(s):  
Kidney Cells ◽  
Baby Hamster Kidney ◽  
Baby Hamster Kidney Cells
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