AIM:To observe the histopathological changes of vascular calcificated rats following intervention with alendronate,further more,to verify the therapeutic action of alendronate on angiosteosis.METHODS:Thirty Sprague Dawley rats were divided into the normal,Vitamin D3 and alendronate groups by random number table after feeding for 1 week.Rats in the Vitamin D3 and alendronate groups were lavaged with 250 000 U/(kg ?d) Vitamin D3 or iso-capacity of sodium chloride at 0,24,and 48 hours after model preparation.From the fourth day,rats in the alendronate group were treated with 0.9 mg/(kg ?d) alendronate.All rats were sacrificed at the end of 6 weeks,removed aorta and aortic arch.The pathological change was analyzed by hematoxylin-eosin staining.In addition,calcium contents of blood vessel were measured.Von Kossa staining,Image-Pro Plus 6.0 image analysis software were used to determine the ratio of calcified plaque,and detected the content of blood fat.RESULTS:There had calcified plaque in the vessel wall of aortic arch in the alendronate group,but the number was obvious smaller than and the necrosis area was significantly lower than that of the Vitamin D3 group.The calcium contents of blood vessel,ratio of calcificated area,as well as the concentration of total cholesterol was decreased compared with the Vitamin D3 group(P

Objective To examine the early effects of prostaglandin E 2 (PGE 2 ) on cancellous bone in 20-month aged male rats. Methods PGE 2 was given to the aged rats for 10 and 30 days at dose of 3 mg?kg -1 d -1 respectively, while designing intact aged male rats as controls. After twice in vivo fluorochrome labeling, undecalcified longitudinal sections were subjected to analysis of bone histomorphometry. Results After 10 days treatment, osteoblast surface 〔(12.3?7.6)%〕 and osteoid surface 〔(20.4?7.2)%〕 were markedly increased than that of controls 〔(1.6?0.7)% and (4.3?1.7)%, P

OBJECTIVE:To study the effect of Yupingfeng(YPF)extract on Ca,P,Mg and hydroxyproline of bone in model rats with osteoporosis induced by cyclophosphamide(CP)and to discuss the preventive and therapeutic effect of YPF ext-ract on CP-induced osteoporosis.METHODS:A total of 40 rats were randomly divided into four groups:control group,CP group,YPF extract group,and calci?m carbonate + Vit D group.The rats were sacrificed at 15 days of experiment,and the levels of Mg,Ca,P and hydroxyproline of left femoral bone were determined.RESULTS:Compared with control group,levels of different index with CP group was significantly decreased;compared with CP group,levels of Ca,Mg,P and hydroxyproline of bone in rats treated with YPF extract were significantly increased.CONCLUSION:CP may induce decrease of levels of Ca,Mg,P and hydroxyproline of bone,however,on which YPF extract has preventive and therapeutic effect.

AIM: To study the antitumor e ff ects of losartan in EAC mice. METHODS: The inhibitory rates of t umor growth and the ratio of extending viability were observed in EAC mice in th ree groups given losartan, 5-FU and NS, respectively. RESULTS: Comparing with the control groups, the inhibition to tumor growth was 46.3 % in losartan ( 12.5 mg?kg -1 ) group. But losartan did not lengthen life time in EAC mice. The inhibition to tumor growth was was 31.5 % in 5-F U (5 mg?kg -1 ) group. CONCLUSION: Losartan can inhibit the tumor growth of EAC, but not lengthen life time of the animals.

Objective To observe the changes of morphology and biochemical parameters in rats with D-galactose-induced skin ageing. Methods Twenty-six female and male rats were randomly divided into 2 groups. D-galactose group rats were injected subcutaneously with 120 mg?kg-1?d-1 of D-galactose everyday, whereas the control group with normal saline. The rats were sacrificed on days 100. The ageing-related biochemical parameters were detected in the blood and skin, and the cutaneous histopathology was observed. Epidermal thickness and area of elastic fibers were determined quantitatively with imaging analysis system. Results Epidermal thickness and content of elastic fibers were significantly lower in D-galactose group than those in the control group. The loose arrangement of collagen and elastic fibers was evident in D-galactose group. These features of the rats in D-galactose group were similar to those in the ageing skin of human beings. Compared with the control group, the levels of hydroxyproline decreased and malondialdehyde (MDA) increased in the skin of the D-galactose group. The activity of glutathione peroxidase (GSH-PX) and catalase (CAT) in the whole blood and that of superoxide dismutase (SOD) in erythrocytes were remarkably reduced in the D-galactose group as compared to the control group. Conclusions The rat models with skin ageing are established by subcutaneous injection of 120 mg?kg-1?d-1 of D-galactose once daily for 100 days. The changes of morphologic and biochemical parameters in these models are analogous to those in human skin ageing.

Dermatitis and eczema are allergic relapsing inflammatory skin disorders. The precise mechanisms still are unclear. Experimental animal models are indispensable tools to study the pathogenic mechanisms and test novel therapy. A considerable number of mouse models have been proposed and used to study specific aspects of the disease. This paper summarizes the currently available animal models.

AIM To study the relationship between hepatic fibrosis and osteoporosis and to determine the preventive effects of Glycyrrhizin on bone loss in mice. METHOD Forty PCR Mice were randomly divided into 4 groups. Group A mice were controls; Group B mice were given sc injection of 40% CCl 4 10 ml?kg -1 once per 5 days as fibrosis model group; Group C were given orally colchicine of 0 01 mg?kg -1 plus CCl 4 sc, Group D were given Glycyrrhizin(GL) of 100 mg?kg -1 orally plus CCl 4 sc. The four groups were treated for 42 days. The liver injury indexes were measured and the mineral elements and Hydroxyproline of the femur were determined. RESULT Compared with group A, the serum enzymes of alanine aminotransferase (ALT), aspartic acid aminotransferase (AST) were markedly increased and serum albumin (Alb) and A/G(Alb/(total protein Alb) were decreased significantly in group B whose liver slides also showed typical liver cirrhosis. The dried weight of femur in the cirrhosis mice was markedly reduced and the bone Calcium content and bone Hydroxyproline content were also significantly decreased in group B. Bone copper and bone magnesium were increased in group B. In group D, GL inhibited markedly the decrease of the serum enzymes and increased Calcium content and Hydroxyproline content of the bone compared with group B. The bone mass loss was prevented effectively by Glycyrrhizin. CONCLUSION The bone mass was lost in mice with chronic hepatic injury induced by CCl 4 and Glycyrrhizin can prevent bone loss which was accompanied by chronic hepatic injury in mice.

Animals for model of osteoporosis involve rat, mouse, rabbit, beagle dog, minipig, sheep, etc. The types of model include aged related model, ovariectomized model, orchietomied model, drug treated model, abolition degeneration model, and dietary bone loss. The rat with ovariectomized model is used widely. Biochemical determination, bone mineral density measurement, bone histomorphorphormetry and bone biomechanics are used to judge the formation of experimental osteoporosis.

AIM: To study the time dose effects of liver damnification induced by CCl 4 in rats. METHODS: The SD rats were given sc injection 60% CCl 4 twice a week to induced liver damage. After the first week, one proportion animals were killed. The contents of serum alanine aminotransferase (ALT), aspartic acid aminotransferase (ALT), hyaluronic Acid (HA), total protein (TP) and albumin (Alb) were investigated, and the thymus, liver, spleen, kidney, and the adrend gland were weighed. On the other hand, the liver tissue was studied with histopathological to observe the degrees of inflammatory activity and fibrous hyperplasia. In the coming the third, fifth, seventh, ninth week, the different proportion animals were done as the above. RESULTS: In the first week, the level of serum ALT were significantly increased; in the third week, the hepatic cells were occurred fattiness denaturalization; in the fifth week, the histopathological showed the necrotic hepatic cells obviously; in the seventh week, the histopathological displayed that the liver turned into fibrotic; and in the ninth week, the liver changed into hepaticfibrosis induced by CCl 4. CONCLUSION: The injection (sc) of 60% CCl 4 will cause diverse hepatic injury with the dissimilar durative time in rats.

BACKGROUND: Shuangshen oral liquid consisting of renshen and danshen is firstly used to treat glucocorticoid-induced osteoporosis. OBJECTIVE: To establish a rat osteoporosis model through glucocorticoid and to observe the preventive effects of shuangshen oral liquid (SS) on bone substance and bone mass. DESIGN, TIME AND SETTING: A completely randomized controlled grouping animal experiment was performed in the Animal Experimental Center and Department of Pharmacology, Guangdong Medical College from June to September in 2008. MATERIALS: High-dose SS consisted of 3.6 kg danshen, 5 kg renshen, and then prepared by water extraction twice, and the concentration was 870g/L. On this basis, high-dose SS was diluted three times to obtain low-dose SS with a concentration of 290 g/L. The prednisone acetate raw medicine was purchased from Zhejiang Xian Ju Pharmaceutical Co., Ltd. METHODS: Thirty-two 3-month-old male SPF rats were randomly divided into 4 groups, and every group had 8 rats. The normal control group rats were fed with distilled water 5 mL/(kg?d) by gavage. Rats in prednisone group were treated with 0.7 g/L prednisone suspension (5 mL/kg per day) by gavage. SS group rats were treated with 0.7 g/L prednisone suspension (5 mL/kg per day) by gavage and then given the high does and low does SS (5mL/kg per day) respectively by gavage 3 hours later. The rats were sacrificed by heart hemospasia 88 days later. MAIN OUTCOME MEASURES: Body mass, bone mineral content and bone hydroxyproline content per unit bone, bone mineral density in the left femur, biomechanics indexes of the right femur. RESULTS: The long-term administration of prednisone restrained the increasing of rats body mass (P