Tooth movement by orthodontic force is based upon alveolar bone resorption at compression site and bone formation at tension site of tooth. The function of cyclic AMP is to participate not only in initial action of bone cells by mechanical forces but also in the continuous cellular response leading, to bone remodeling. This experiment was performed to clarify the role of cyclic AMP in bone remodeling by mechanical forces. The orthodontic forces of about 80 gm and 100 gm were applied to the right canines of maxillary and mandibular bone, respectively, in cats, treated for periods of time ranging from one hour to 28 days. Alveolar bones were obtained from compression and tension sites . surrounding tipping maxillary and mandibular canines as well as from contralateral control sites. The samples were extracted, boiled and homogenized, and the supernatants were assayed for cyclic AMP by a radioimmunoassay mothod. The results were as follows: 1. The orthodontic movement of canines was increased to the end of experimental period and the action of orthodontic forces on tooth movement was more effective in maxillary canine. 2. The cyclic AMP levels of alveolar bones in compression and tension sites initially decreased, then increased and remained elevated to the end of experiment. The differences of the cyclic AMP levels between treated sites and non-treated sites were gradually increased. 3. The cyclic AMP levels in treated sites of mandibular alveolar bone was higher than that of maxillary alveolar bone.
Animals ; Bone Remodeling ; Bone Resorption ; Cats ; Cyclic AMP* ; Osteogenesis ; Radioimmunoassay ; Tooth ; Tooth Movement

PURPOSE: We reviewed radiological mid-term results of cementless hip replacement using Mallory-Head tapered titanium femoral stem. MATERIALS AND METHODS: Forty six patients, 50 hips were followed for more than 5 years. Mean age was 56 years, and mean follow-up period was 6.8 years. Radiologically changes in alignment, subsidence and wear rate were measured. Radiolucent line, endosteal spot weld and osteolysis were also assessed according to Gruen zones. RESULTS: All stems showed stable fixation, and radiolucent lines were observed in noncoated zones of 13 cases (26%) . Osteolysis was observed around the proximal stem in 16 cases (32%) , but it did not progress distally. CONCLUSION: With minimum follow-up of 5 years, the tapered titanium femoral stem showed good radiological results, however osteolysis needs more long-term follow-up.
Arthroplasty* ; Follow-Up Studies* ; Hip* ; Humans ; Osteolysis ; Titanium

It had heen emphasized the necessity for upper gastrointestinal endoscopic examinations in patients. Who has had gastrectomy and presents persisting gastrointestinal symptoms. This study was conducted to evaluate endoscopic findings and clinical symptoms in patients following gastrectomy. (continue...)
Gastrectomy* ; Humans

No abstract available.
Angiotensin II* ; Angiotensins* ; Animals ; Endocrine System* ; Rats*

Beta-lapachone (beta-Lap; 3,4-dihydro-2, 2-dimethyl-2H-naphthol[1, 2-b]pyran-5,6-dione) is a novel anti-cancer drug under phase I/II clinical trials. beta-Lap has been demonstrated to cause apoptotic and necrotic death in a variety of human cancer cells in vitro and in vivo. The mechanisms underlying the beta-Lap toxicity against cancer cells has been controversial. The most recent view is that beta-Lap, which is a quinone compound, undergoes two-electron reduction to hydroquinone form utilizing NAD(P)H or NADH as electron source. This two-electron reduction of beta-Lap is mediated by NAD(P)H:quinone oxidoreductase (NQO1), which is known to mediate the reduction of many quinone compounds. The hydroquinone forms of beta-Lap then spontaneously oxidizes back to the original oxidized beta-Lap, creating futile cycling between the oxidized and reduced forms of beta-Lap. It is proposed that the futile recycling between oxidized and reduced forms of beta-Lap leads to two distinct cell death pathways. First one is that the two-electron reduced beta-Lap is converted first to one-electron reduced beta-Lap, i.e., semiquinone beta-Lap (SQ).- causing production of reactive oxygen species (ROS), which then causes apoptotic cell death. The second mechanism is that severe depletion of NAD(P)H and NADH as a result of futile cycling between the quinone and hydroquinone forms of beta-Lap causes severe disturbance in cellular metabolism leading to apoptosis and necrosis. The relative importance of the aforementioned two mechanisms, i.e., generation of ROS or depletion of NAD(P)H/NADH, may vary depending on cell type and environment. Importantly, the NQO1 level in cancer cells has been found to be higher than that in normal cells indicating that beta-Lap may be preferentially toxic to cancer cells relative to non-cancer cells. The cellular level of NQO1 has been found to be significantly increased by divergent physical and chemical stresses including ionizing radiation. Recent reports clearly demonstrated that beta-Lap and ionizing radiation kill cancer cells in a synergistic manner. Indications are that irradiation of cancer cells causes long-lasting elevation of NQO1, thereby sensitizing the cells to beta-Lap. In addition, beta-Lap has been shown to inhibit the repair of sublethal radiation damage. Treating experimental tumors growing in the legs of mice with irradiation and intraperitoneal injection of beta-Lap suppressed the growth of the tumors in a manner more than additive. Collectively, beta-Lap is a potentially useful anti-cancer drug, particularly in combination with radiotherapy.
Animals ; Apoptosis ; Benzoquinones ; Cell Death ; Electrons ; Humans ; Hydroquinones ; Injections, Intraperitoneal ; Leg ; Mice ; NAD ; Naphthoquinones ; Necrosis ; Radiation Tolerance ; Radiation, Ionizing ; Reactive Oxygen Species ; Recycling ; Substrate Cycling

BACKGROUND: Mixed venous oxygen saturation (SO2) monitoring turned out to be invaluable in following up systemic cardiovascular status. But balloon-tipped flow-directed thermodilution catheter (Swan-Ganz catheter) insertion carries additional inherent risks other than those of central venous catheterization, and it costs much more expense than simple venous catheter. There has been a lot of papers which argue that central venous catheterization may substitute for the Swan-Ganz catheterization. In addition, it may be very difficult or impossible to insert the Swan-Ganz catheter in pediatric patients. This study was performed to determine whether Swan-Ganz catheterization might be replaced by the central venous catheterization in regards to SO2. METHODS: In 17 pediatric open heart surgery (OHS) patients, from the central venous catheter, the tip of which had been located in the center of right atrium (RA) and pulmonary artery, blood samples were drawn for gas analysis simultaneously, which was done immediately after emergence from cardiopulmonary bypass. RESULTS: There were no significant differences between RA blood and mixed venous blood gas analyses except oxygen saturation. The oxygen saturations of both were linearly correlated with each other. The relation was SO2=17 0.8 SRAO2 (R=0.77, p<0.05) CONCLUSIONS: It may be concluded that RA blood may be used for blood gas analysis in place of mixed venous blood immediately after pediatric open heart surgery.
Blood Gas Analysis ; Cardiopulmonary Bypass* ; Catheterization, Central Venous ; Catheterization, Swan-Ganz ; Catheters ; Central Venous Catheters ; Heart Atria ; Heart* ; Humans ; Oxygen* ; Pulmonary Artery ; Thermodilution ; Thoracic Surgery*

No abstract available.
Humans ; Peritoneal Dialysis, Continuous Ambulatory* ; Peritonitis*

Stasis dermatitis is one of the important skin manifestations of venous stasis. Therefore, the searching for the cause of venous stasis is importrnt. Two cases of stasis dermatitis with inferior vena caval obstruction are reported and possible etiologic factor is discussed. Case I The patient, 38-year-old carpenter, was admitted at Choong Buk Medical Center in April, 1974 with superficial venous engorgement of the lower extremities which had begun to appear two years after severe blunt trauma to both legs in 1962. 5 years prior to admission, abdomial venous engorgement and abdominal fullness developed and was exaggerated gradually. Since 2 years prior to admission, he has been suffered from the recurrent exudative ulcer on the right lower leg The physical examination revealed mild icteric sclera, hepatomegaly, abdominal distension, tortuous venous engorgement on the abdomen, the lateral chest wall and the lower extremities, and edematous scaly brawny pigmentation of the lower legs. Esphagogram showed no esphageal varices. Inferior vena cavogram showed complete obstruction at the level of upper border of 2nd lumbar vertebra and well developed collateral circulation, Findings of skin biopsy on the right lower leg showed moderate acanthosis, increased pigmentation of bosal cell layer in the epidermis, capillary proliferation, diffuse inflammatory cell infiltration with increased fibrosis and hemosiderin granules in the dermis. Case II The patient. 36-year-old farmer, was admitted at Dept. of Dermatology, St. Mary's Hospital, Catholic Medical College in Sept., 1973.The physical examination revealed hepatomegaly, abdominal distension, superficial venous engorgement on the abdomen, the neck and the lower extrcmities, severe edema and pigmentation of the lower legs, and the multiplc. Exudative ulcers on the left lower leg. Liver scanning showed somewhat general enlargement with some mottlings along the margin and relative prominance of the left lobe. Liver biopsy revealed findings of non specific chrcnic hepatitis. Inferior vena cavogram through the left femoral vein showed complete obstruction at the level between 11th and 12th thoracic vertebrae.His peripheral edema and ascites was much subsided after adequate bed rest and the skin lesion improved with scar formation.
Abdomen ; Adult ; Ascites ; Bed Rest ; Biopsy ; Capillaries ; Cicatrix ; Collateral Circulation ; Dermatitis* ; Dermatology ; Dermis ; Edema ; Epidermis ; Femoral Vein ; Fibrinogen ; Fibrosis ; Hemosiderin ; Hepatitis ; Hepatomegaly ; Humans ; Hyperemia ; Leg ; Liver ; Lower Extremity ; Neck ; Physical Examination ; Pigmentation ; Sclera ; Skin ; Skin Manifestations ; Spine ; Thoracic Wall ; Ulcer ; Varicose Veins

BACKGROUND: Preservation of antigen determinants while retaining morphological detail is prerequisite for high quality immunohistochemistry. Conventional formalin fixation and paraffin embedding procedures are useful in preserving tissue architecture and cytologic detail. However, they destroy the antigenicity of many proteins is tissue samples. On the other hand, fresh frozen section preserve the antigenicity of most proteins, but vield poor morphological preservation. OBJECTIVE: The purpose of this study is to evaluate the AMeX method as to the ability to preserve both antigenicity and morphologic details of the skin basement membrane zone so that precise localization of antigens can be attained in immunohistochemistry. METHODS: Tissues were fixed in acetone at -20degrees C over night, then cleared in methyl benzoate and xylene, consecutively, and embedded in ordinary paraffin at 58-60degrees C. Sections made from this paraffinembedded tissue were stained with hematoxylin and eosin for a morphologic study and immunolabelled with antibodies against major basement membrane antigens to evaluate antigenic preservation. The staining intensity and preservation of the morphology by the AMeX method were compared with conventional formalin processed tissues and frozen tissues. RESULTS: Morphological preservation of the AMeX method-processed sections was good throughout the epidermis, basement membrane, and dermis, and as good as that of routinely formalin-fixed paraffin-embedded sections. Frozen sections usually revealed revealed various degrees of damage by ice crystal formation throughout the epidermis to the dermis. The AMeX method-processed sections showed better or same antigenic preservation comparing the frozen sections when the sections were immunolabelled with specific monoclonal antibodies. But, when the sections were immunolabelled with patient's sera, the AMex method showed less antigenic preservation than the frozed sections. The anti-type IV collagen monoclonal antibody exhibited immunoreactivity only conventional formalin-fixed paraffin-embedded skin sections, but the intensity of the staining was weaker than the AMeX processed sections and the frozen sections. CONCLUSION: The AMeX method can be utilized for the demonstration of skin basement membrane antigens and is superior to the fresh-frozen method in that the histologic figures are more distinct and antigencity can be preserved for a long time.
Acetone* ; Antibodies ; Antibodies, Monoclonal ; Basement Membrane* ; Benzoates* ; Collagen ; Dermis ; Eosine Yellowish-(YS) ; Epidermis ; Formaldehyde ; Frozen Sections ; Hand ; Hematoxylin ; Ice ; Immunohistochemistry ; Paraffin ; Paraffin Embedding ; Skin* ; Xylenes*

Effect of Enoxacin (Flumark), an oral pyridone carboxylic acid, in the urinary tract infection was evaluated clinically and susceptibility of 292 strains of microorganism isolated from urine to the various antimicrobial agents was tested and compared. Thirty six patients with urinary tract infection were given with 300 to 600mg of Enoxacin daily for 7 to 14 days according to severity of urinary tract infection. The clinical symptoms and urinary findings improved in 30 patients (83.3%) and no clinical response was achieved in 6 patients (16.7%), but revealing 100% response in 9 patients of acute uncomplicated cystitis. In the antimicrobial susceptibility test, Enoxacin was much superior to aminoglycoside, especially against Pseudomonas aeruginosa. Serratia spp., Enterobacter spp. and other Pseudomonas spp.. Enoxacin is a very effective and safe antimicrobial agent in treatment of the urinary tract infection.
Anti-Infective Agents ; Cystitis ; Enoxacin ; Enterobacter ; Humans ; Pseudomonas ; Pseudomonas aeruginosa ; Serratia ; Urinary Tract Infections* ; Urinary Tract*