One of the primary functions for which bones have evolved is to act as a structural support. To achieve this, bones remodel throughout life so that their structure remains optimal for the prevailing mechanical environment. Bone remodeling consists of an initial phase of osteoclastic bone resorption followed by a bone formation period. Prostaglandins are potent regulators of bone formation and bone resorption that can have both stimulatory and inhibitory effects. Elevation of intracellular cAMP is an important intracellular signaling mechanism involved in the regulation of the expression of many proteins. In this study we examine whether PGE or DBcAMP affects osteoblastic activation or osteoclastic differentiation in mouse bone marrow cells and osteosarcoma ROS 17/2.8 cells. The effect of PGE and DBcAMP on the cell proliferation was measured by the incorporation of [3H]- thymidine into DNA. As a result, PGE2 (0.5-1 ug/ml) and DBcAMP (0.1-0.5 mM) inhibited the [3H]-thymidine incorporation into DNA in a dose dependent manner. The effect of PGE2 and DBcAMP on the induction of alkaline phosphatase (ALP) was investigated in ROS 17/2.8 cells cultured in medium containing 0.4% fetal bovine serum. PGE and DBcAMP stimulated ALP activity in the cells in a dose- dependent manner. PGE2 also increased the intracellular cAMP content in a dose- dependent fashion with a maximal effect at 0.5 ug/ml. ROS 17/2.8 cells release nitric oxide upon stimulation of PGE2 or DBcAMP with interferon-r. PGE2 and DBcAMP increase the phosphorylation level of CREB (cAMP response element binding protein) without any change on the amount of CREB protein. Also, PGE (10-6 M) and DBcAMP (10-4 M) significantly increase the generation of osteoclasts in mouse bone marrow cell culture system. In conclusion, the results of this study suggested that cAMP appears to be an important regulatory molecule in the processes of bone formation and resorption.
Alkaline Phosphatase ; Animals ; Bone Marrow Cells ; Bone Remodeling ; Bone Resorption ; Bucladesine* ; Cell Proliferation ; Cyclic AMP Response Element-Binding Protein ; Dinoprostone* ; DNA ; Metabolism* ; Mice ; Nitric Oxide ; Osteoblasts ; Osteoclasts ; Osteogenesis ; Osteosarcoma ; Phosphorylation ; Prostaglandins ; Prostaglandins E ; Response Elements ; Thymidine

CTLA-4 (=CD152), a T cell activation antigen, has been known to be homologous to CD28 in its molecular and genomic structure. Both of these two molecules are sharing their counterreceptors, B7 (CDSO) and B7-2 (CD86) and are known to play a crucial role in T cell activation. In previous our study it was reported that there are 2 forms of CTLA-4 antigen in activated human T cells, 30 kD membrane-bound form and 34 kD cytosolic-sequestered form and the former was less than 5 % of total of this antigen induced. Aims of this study are to confirm previous finding by using flow cytometry and to characterize the cytoplasmic form of human CTLA-4 by using ultrafiltration and immunoprecipitation techniques. In PHA stimulated peripheral blood lymphocyte surface expression of CTLA-4 was less than 2.1% of any of CD4+, CD8+ and CD56+ subsets. And the 34 kD form of CTLA-4 was detected in CDS+ subset only. This discrepancy confirms that 34 kD antigen is the cytoplasmic form of human CTLA-4. In ultrafiltration and subsequent Western blot analysis study this 34 kD antigen was detected in >100 kD fraction only. And in non-reducing condition this antigen formed high molecular weght complex (MW > 350 kD). In immunoprecipitation study using anti-peptide A antibody it was found that this high molecular weight complex consists of the 34 kD cytoplasmic form of CTLA-4 and previously unknown 54 kD antigen and 46 kD antigen at 1:1:8-10 ratio. And none of these 3 molecules were identified in membrane fraction of activated human T cell. The result of this study implies that CTLA-4 molecule induced upon T cell activation mainly sequestered in cytoplasrn and another signal is necessary to target this antigen on the activated T cell surface.
Antigens, CD27 ; Blotting, Western ; CTLA-4 Antigen ; Cytoplasm* ; Flow Cytometry ; Humans* ; Immunoprecipitation ; Lymphocytes ; Membranes ; Molecular Weight ; T-Lymphocytes ; Ultrafiltration

No abstract available.
Humans ; Twins, Monozygotic*

Microsurgery offers a more effective approach to the brachial plexus lesions than any treatments previously available. The authors have performed operation to the injured plexus by microsurgical techniques since 1980. We selected 15 patients whom we could follow more than one year and had results as follow. 1. The causes of injuries were traffic accident(7 cases), gun-shot injury(4 cases), stab wound(3cases), and belt injury (1 case). 2. Two patients had preganglionic lesion and 13 patients had postganglionic lesions, among which seven cases were supraclavicular and six cases were infraclavicular. Most frequently injured site was in upper two roots and upper trunk (7 cases). 3. All of them were treated by surgical intervention, 12 cases by interfascicular nerve graft using autogenous sural nerve, one case by intercostal neurotization, one case by neurolysis, and one case by exploration only. 4. Elbow flexor and deltoideus were involved easily by injury than other muscles, but they had best prognosis to the microsurgical treatment. 5. The recovery of wrist and finger function was poor but they were frequently preserved from injury.
Brachial Plexus ; Elbow ; Fingers ; Humans ; Microsurgery ; Muscles ; Nerve Transfer ; Prognosis ; Sural Nerve ; Transplants ; Wrist

No abstract available.
Animals ; Gram-Negative Bacteria* ; Interleukin-2* ; Mice*

Femoral head and neck fractures during the course of avascular necrosis are rare with only few reports in the English literature. Moreover, there are very few reports on an analysis of the patterns of these fractures. Four cases of femoral head fracture caused by minor trauma, which were quite different from the crescent fractures during the course of avascular necrosis were analyzed in regard to the underlying disease, causes, sites, types, directions, pattern of fractures and the injury mechanism of the fractures. The results are reported with special regard to the pattern of the stress fracture of the femoral head and neck during the course of avascular necrosis.
Fractures, Stress ; Head* ; Neck* ; Necrosis*

Intravenous pyogenic granuloma (IVPG) is a form of pyogenic granuloma (PG) in which the capillary proliferation is confined entirely within the lumen of a vein. It occurs typically in the neck and upper extremities. Histologically, this benign lesion is similar to PG of other localizations and is characterized by a lobular proliferation of capillaries growing in a sparsely cellular, edematous collagenous stroma. We report a case of IVPG developing in the palm, an unusual site of occurrence.
Capillaries ; Collagen ; Granuloma, Pyogenic* ; Neck ; Upper Extremity ; Veins

No abstract available.

No abstract available.
Osteosarcoma* ; Retinoblastoma*

Cutarieous manifest,ations and systemic complications were observed in 521 patient., with diabetes mellitus. The results were as follows: Total 70, 8% of patients had complications', In 16. 5%, cutaneous manifestation were observed. Systemic complications were observed in 27 6%, Both eutaneous manifestations and systemic complications were observed in 26 7% 2 The cutaneous mariifestations observed in 43 2%, were cutaneous infection, pruritus, shin spot, diabetic foit, peripheral edema, diahetic bulla, foot gangrene and rutieosis in the order of frequency, 3, The cutaneous manifestations were much more observed in patients with systemic complications than without them(p<0 05), and with longer duration more than 10 years history, 4. It seems to be no relationship between the cutancous manifestations and fasting blood sugar level.
Blood Glucose ; Diabetes Mellitus* ; Edema ; Fasting ; Foot ; Gangrene ; Humans ; Pruritus ; Statistics as Topic*