Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:3.4.24.3 (collagenase)
 18,340 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Rat livers were perfused and stored for 48 hr in cold University of Wisconsin solution before dissociation by the two-step collagenase method. At that time, glycogen content was significantly reduced, but no obvious changes in albumin, beta-actin and aldolase B mRNAs and in glutathione levels were observed. Enzymatic perfusion yielded 280 +/- 30 x 10(6) viable hepatocytes vs. 520 +/- 40 x 10(6) viable hepatocytes from unstored organs. Cell viability determined by trypan blue exclusion was 74% and 90%, respectively. Hepatocytes from University of Wisconsin-preserved livers had a 29% reduced adenosine triphosphate content, but glutathione levels did not significantly differ from those found in unstored cells. When put into culture, hepatocytes formed typical monolayers of granular epithelial cells and did not exhibit alteration of their fine structure when compared with cells from unstored organs. After 24 and 48 hr, they showed variations in cytochrome P-450 content and ethoxyresorufin O-deethylase activity similar to those observed with unstored cells. By contrast, overall protein synthesis and albumin secretion rate were 40% and 30% lower, respectively. Hepatocytes from University of Wisconsin-preserved organs could be cryopreserved and further cultured as unstored cells. The University of Wisconsin solution was also used to preserve isolated hepatocytes. Viability of freshly isolated hepatocytes was decreased by only 10% after 48 hr of hypothermic liver storage when assayed by intracellular lactate dehydrogenase content. However, after 4 hr of storage, in contrast with hepatocytes preserved in L15 Leibovitz medium, the cells attached poorly to plastic and exhibited morphological alterations.(ABSTRACT TRUNCATED AT 250 WORDS)
 ...
PMID:Primary culture of adult rat hepatocytes after 48-hour preservation of the liver with cold UW solution. 225 48

Trout testes at various stages of maturation were dissociated by perfusion at 12 degrees C with collagenase plus pronase and then with collagenase alone, followed by slight shaking overnight in 1% bovine albumin. This step provided a suspension of isolated somatic and germ cells, clusters of interstitial cells, and either intact spermatogenetic cysts (meiotic testes) or clusters of Sertoli cells (other testes). Most of the spermatozoa were removed from the testis cell suspension by centrifugation in Percoll (density 1.065 g/ml). Sertoli and Leydig cells were prepared by a two-step separation method: 1) the testis cell suspension was separated by sedimentation at unit gravity into "isolated cell" and "cell cluster" populations; 2) these populations were fractionated by isopyknic centrifugation in Percoll gradients. In terms of somatic cell composition, a nearly pure Sertoli cell (clusters) population was obtained between 1.017 and 1.033 g/ml and a Leydig cell (clusters) enriched population of between 1.033 and 1.048 g/ml (testes resuming spermatogenesis) or 1.048 and 1.062 g/ml (other testes). These various cell populations were cultured in modified Leibovitz L15 medium for 10-15 days. When seeded, the Sertoli cells had a normal ultrastructure that remained unchanged for at least 10 days, and the steroidogenic activity of Leydig cells could be stimulated by salmon gonadotropin. Leydig cells remained 3 beta-HSD positive and produced progesterone and 17 alpha, 20 beta-OH progesterone for at least 11 days. This study points out that viable and differentiated trout somatic testicular cells can be prepared and cultured for several days.
 ...
PMID:Trout Sertoli and Leydig cells: isolation, separation, and culture. 323 52

16,16-Dimethyl PGE2 (dmPGE2) has previously been shown to protect the in vivo rat liver against CCl4-induced damage. These studies were undertaken to determine if this protection could be demonstrated in vitro where factors of absorption, secretion, and blood flow are not present. Primary hepatocyte cultures were established by perfusing rat liver with collagenase. Hepatocytes were plated at a density of 2 X 10(4) cells/cm, allowed 90 min to attach, then stabilized in L15 medium for 18 h. Hepatocytes were then challenged with CCl4 with concomitant exposure to 10(-9) to 10(-5) M dmPGE2, stearic acid, oleic acid, or ethanol vehicle (0.00001 to 0.1%). After 1 h, challenge was aspirated and cells were stained with 0.04% trypan blue to determine viability. Hepatocytes in the vehicle groups took up more trypan when exposed to CCl4 than those treated with dmPGE2, stearic acid, or oleic acid at concentrations of 10(-9) to 10(-7) M. At 0.1% ethanol vehicle protected as well as all other treatments. Protection against CCl4 by dmPGE2, stearic, and oleic acids as well as high concentrations of ethanol may occur by altering the metabolism of CCl4.
 ...
PMID:16,16-Dimethyl PGE2 and fatty acids protect hepatocytes against CCl4-induced damage. 403 Jun 26

Human fetal kidney explants can be maintained during 5 days in Leibovitz's L15, a basic serum-free medium. Because culture conditions are minimal for growth and differentiation, DNA synthesis drastically decreases during the first 48 h, but stabilizes thereafter. The addition of insulin plus transferrin significantly restores this important cellular function in kidneys of fetuses younger than 16 wk. However, renal explants from older fetuses are more difficult to culture: they respond less to growth factors and are more prone to necrosis. The objective of this study was to verify the influence of tetracycline, an antibiotic with anti-collagenase potential, on cultured kidney explants aged 17 to 20 wk. The addition of 20 micrograms/ml tetracycline did not influence DNA synthesis nor the effectiveness of insulin plus transferrin on cell proliferation. Nor did it change the activities of alkaline phosphatase and gamma-glutamyltransferase, two enzymic markers of brush border differentiation. After 5 days in L15 alone, explants often showed necrosis and an important reduction in both weight and volume. Insulin plus transferrin significantly restored these parameters to control values observed at Day 0, but evidence of necrosis was still present. Tetracycline alone markedly reduced explant necrosis resulting in a significant increase in weight and volume. The effectiveness of insulin plus transferrin on explant morphometry was not improved when tetracycline was added as third factor. These results indicate that insulin plus transferrin restores explant mass through cell proliferation, whereas tetracycline does so possibly through a reduction in extracellular matrix degradation. The two effects are not additive in cultured mid-term fetal kidneys.
 ...
PMID:Positive influence of tetracycline on human fetal kidney in serum-free organ culture. 791 74

To study liver functions of chicken, we examined the primary culture of chicken hepatocytes, and found an easy method of long-term culture with free atmosphere exchange. Chicken hepatocytes were obtained by collagenase perfusion and cultured at 37 degrees C as a monolayer without substratum in serum-free L-15 medium (pH 7.8) with free atmosphere exchange. The amounts of albumin and transferrin in medium were assayed by ELISA. The culture of chicken hepatocytes was maintained in the serum-free L15-medium )pH 7.) and 37 degrees C with free atmosphere exchange for 20 days. The amount of albumin secreted in the medium decreased to low levels early in culture; however, this was followed by marked increase from day 9 to day 17 of culture. The amount of transferrin was constant until day 6, then it too increased with further culture. We reported an easy method for the simple monolayer culture of chicken hepatocytes in serum-free L12 medium (pH 7.8) with free atmosphere exchange over an extended period. Expression of liver-specific functions, viz. albumin and transferrin synthesis, was observed after 1 week of culture.
 ...
PMID:Primary culture of chicken hepatocytes in serum-free medium (pH 7.8) secreted albumin and transferrin for a long period in free gas exchange with atmosphere. 902 95