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Biomedical subjects

B Carlsen

Publications and source records attributed to B Carlsen.

9 recordsLinked to original sources
PubMed2001

Bone morphogenetic protein-2 (BMP-2) and transforming growth factor-beta1 (TGF-beta1) alter connexin 43 phosphorylation in MC3T3-E1 Cells.

BACKGROUND: Bone morphogenetic proteins (BMPs) and transforming growth factor-betas (TGF-betas) are important regulators of bone repair and regeneration. BMP-2 and TGF-beta1 have been shown to inhibit gap junctional intercellular communication (GJIC) in MC3T3-E1 cells. Connexin 43 (Cx43) has been shown to mediate GJIC in osteoblasts and it is the predominant gap junctional protein expressed in these murine osteoblast-like cells. We examined the expression, phosphorylation, and subcellular localization of Cx43 after treatment with BMP-2 or TGF-beta1 to investigate a possible mechanism for the inhibition of GJIC. RESULTS: Northern blot analysis revealed no detectable change in the expression of Cx43 mRNA. Western blot analysis demonstrated no significant change in the expression of total Cx43 protein. However, significantly higher ratios of unphosphorylated vs. phosphorylated forms of Cx43 were detected after BMP-2 or TGF-beta1 treatment. Immunofluorescence and cell protein fractionation revealed no detectable change in the localization of Cx43 between the cytosol and plasma membrane. CONCLUSIONS: BMP-2 and TGF-beta1 do not alter expression of Cx43 at the mRNA or protein level. BMP-2 and TGF-beta1 may inhibit GJIC by decreasing the phosphorylated form of Cx43 in MC3T3-E1 cells.

Animals↗
PubMed2001

Effect of serial passage on gene expression in MC3T3-E1 preosteoblastic cells: a microarray study.

The osteoblastic function of mouse preosteoblastic MC3T3-E1 cells, as measured by alkaline phosphatase activity and osteocalcin secretion, decreases after serial passage. To uncover genes responsible for decreased osteoblastic function in high-passage cells, we have studied passage-dependent change of gene expression in MC3T3-E1 cells. Changes in the expression pattern of 2000 selected genes were examined simultaneously by comparing mRNA levels between MC3T3-E1 cells at passage 20 and passage 60 using the cDNA microarray analysis. Significant changes in the steady-state abundance of 27 mRNAs were observed in response to different passage numbers, including 17 known genes, 4 ESTs with homology to known genes, and 6 genes with no previously described function or homology. Northern blot analysis was used to verify and quantify the expression of selected genes, and revealed a significant higher level of up- and down-regulation compared to microarray data. These results indicate the existence of a significant change in gene expression in osteoblastic cells undergoing serial passages. Such changes might be responsible for a reduction in bone regeneration in older osteoblasts. Potential roles of selected genes in bone aging are discussed.

Aging↗
PubMed1998

Laparoscopic removal of a right adrenal pheochromocytoma in a pregnant woman.

Pheochromocytomas are a rare cause of hypertension in pregnancy. Laparoscopic adrenalectomy has been used effectively and safely in nonpregnant patients with pheochromocytoma, with the resultant benefits to the patients of less postoperative pain, shorter hospital stay, and quicker return to normal activities than is associated with open techniques. This represents the first report of a laparoscopic adrenalectomy for pheochromocytoma in a pregnant woman. Issues that are unique to laparoscopic surgery in pregnant patients are discussed.

Adrenal Gland Neoplasms↗
PubMed1997

Oncostatin M induces basic fibroblast growth factor expression in endothelial cells and promotes endothelial cell proliferation, migration and spindle morphology.

Oncostatin M (OSM), a pleiotropic cytokine originally isolated from supernatants of the U937 histiocytic lymphoma cell line, has been shown to have regulatory effects on a wide variety of cultured and tumor cells. We investigated the effects of OSM on basic fibroblast growth factor (bFGF) gene expression in bovine arterial endothelial (BAE) cells. Levels of bFGF mRNA transcripts were low in uninduced BAE cells, were maximal at 8 hours of exposure to OSM, and returned to control levels by 24 hours. Induction of bFGF mRNA transcripts by OSM was dose-dependent. Nuclear transcriptional run-on analysis demonstrated that exposure of BAE cells to OSM stimulated bFGF gene transcription. OSM treatment of BAE cells enhanced the synthesis of bFGF protein as determined by ELISA assays. Immunocytochemistry studies demonstrated the presence of low levels of bFGF protein within the cytoplasm in uninduced cells. After stimulation for 8 hours with OSM there was significant staining for bFGF in the cytoplasm. However, 24 hours after exposure to OSM, bFGF antigen was located only within the nuclei. Western blot analysis demonstrated that OSM stimulated predominantly the synthesis of a 22 kDa form of bFGF. In addition, OSM stimulated endothelial cell proliferation and migration as well as acquisition of a spindle shape. Phosphorothioate antisense oligonucleotide directed against bFGF inhibited OSM induced BAE cell proliferation and spindle shape formation but had only a minimal effect on migration. The levels of the 22 kDa form of bFGF were reduced by antisense treatment indicating that OSM induced proliferation and morphology change is likely to be regulated by intracellular bFGF. Our studies suggest that OSM released at sites of vascular injury could stimulate angiogenesis by inducing bFGF synthesis, endothelial cell proliferation and migration.

Animals↗
PubMed1983

Release surgery in stiffness of the knee.

Seven patients have been operated for significantly reduced motion in a knee. A standardized operative technique is described. Excision of scar tissue in the recessus superior, patellofemoral joint and anterior part of the tibiofemoral joint was necessary in all cases. But most important was the release of the retinacula and the sliding mechanism on the medial and lateral side of the joint. The mean gain in motion was 76 degrees. The result was excellent in three patients and good in four. There were no serious complications.

Adult↗
PubMed1982

Preoperative Cotrel traction in idiopathic scoliosis.

Eighty consecutive patients with idiopathic scoliosis were treated preoperatively with Cotrel traction. Distraction X-rays were taken 2 or 3 days after start of traction and 8-10 days later. In 47 patients equal distraction force was applied in both instances. The force, averaging 28 klb, was measured on the head sling. Cotrel traction reduced the spinal curve 37.5 per cent in the first and 38.9 per cent in the second measurement. The difference is not significant. Preoperative Cotrel traction did not improve the surgical curve correction. Postoperative loss of correction and complication rate was insignificantly reduced compared with the results in a previous study. Cotrel traction does, however, give some indication of the surgical correction achievable.

Adolescent↗
PubMedDate not supplied

Study of peristomal skin disorders in patients with permanent stomas.

The aim of this article was to investigate the frequency, severity and diversity of peristomal skin disorders among individuals with a permanent stoma in a community population. All individuals with a permanent stoma (n=630) in a Danish community population were invited to participate in a cross-sectional study. A total of 202 individuals (101 men; 101 women) agreed to participate. Data were collected through questionnaires and clinical examinations. It was found that peristomal skin disorders were higher for participants with an ileostomy (57%) and urostomy (48%) than in those with a colostomy (35%). Of the diagnoses of skin disorders, 77% could be related to contact with stoma effluent. Only 38% of diagnosed participants agreed that they had a skin disorder and more than 80% did not seek professional health care. The study revealed a high frequency of peristomal skin disorders. Participants frequently failed to perceive that they had a skin irritation and did not seek help. This suggests that more education and perhaps regular, annual follow-up visits at local stoma care clinics are needed.

Adolescent↗