Phage display is a widely used gene engineering high technology.Through the display of exogenous peptides or proteins fused specific coat protein on the surface of phages,it is possible to construct proteins or peptides libraries and screen interesting proteins,peptides and antibodies successfully.Most commonly used phage display technology is phagemid/helper phage system,in which helper phages are essential for the replication and assembly of phagemid particles.In this review,in combination with the newest research dynamic status,we summarize phagemid/helper phage double-genome system.We mainly emphasized the features and mutation mechanisms of different helper phages.We also made some prospects for the future directions,in the meanwhile,we also expect that our experience can provide some help for further maturity of the technology.

Possible seasonal differences in serum Insulin-Like Growth Factor-I (IGF-I) concentrations have not been studied in newborn infants. Recently we demonstrated sea- sonal differences in bone mineral content (BMC) in newborn infants: lower BMC was present in summer vs. winter-born infants (J Pediatr Gastroenterol Nutr 1992; 15: 285). In a second stduy, higher serum osteocalcin, an index of bone formation, and lower BMC were found in summer vs. winter (J Pediatr Gastroenterol Nutr 1994; 19: 2207). We speculated that increased serum osteocalcin in summer could be an adaptive response to decreased bone mass. Since growth factors such as IGFs are local regulators of bone formation, we hypothesized that in summer-born infants, serum IGF-I will be higher than in winter, associated with high bone formation activity. Fifty-nine healthy, term appropriate for gestational age (AGA) infants were studied prospectively in winter (Jan-Mar, 29) and in summer (July-Sept., 30). Thirty infants were male, and 29 infants were female. Gestational ages and birth weights were not different by season(in summer, mean+SD, 39.61.1 wk, 3,471360 g,' in winter, 39.31.4 wk, 3,402 392 g). Cord serum IGF-I was measured by radioimmunoassay, modified from Furlanetto et al (1977), after acidification and sep-pack extraction of serum, and osteocalcin concentrations were determined by a kit radio-immunoassay. Cord serum IGF-I concentrations were not different by season of birth(summer vs. winter, 20.11.83 vs. 16.5 1.75 ng/mL, p=0.2). No gender differences were found: 18.21.8 vs. 18.2+1.8 ng/ mL in males vs. females. Serum osteocalcin was higher in summer vs. winter-born infants (8.22.3 vs. 4.951.58 ng/mL, p=0.009). BMC was different by season (87.2+ 14.5 vs. 94.1+16.4 mg/cm, p=0.02). Cord serum IGF-I was not related to serum osteocalcin and BMC. We conclude that serum IGF-I concentrations are not different by season or gender, and are not related to bone formation activity and BMC. Thus, IGF -I concentrations in serum are not seasonally regulated, nor associated with an index of bone formation activity.
Birth Weight ; Bone Density ; Female ; Gestational Age ; Humans ; Infant ; Infant, Newborn* ; Insulin-Like Growth Factor I ; Intercellular Signaling Peptides and Proteins ; Male ; Osteocalcin ; Osteogenesis ; Prospective Studies ; Radioimmunoassay ; Seasons*

Objective To observe the effect of oral minirin in postoperative transsphenoidal surgery patients with central diabetes insipidus. Methods The changes in the urine volume and osomlality after two weeks of minirin medication (0. lmg, 3 times each day) were observed in 34 patients with central diabetes insipidus underwent transsphenoidal surgery. Results After two weeks of minirin therapy,the average daily urine volume decreased from 7985.40 ±410. 36 ml to 2277. 87 ± 328. 94 ml,and the average plasmas osmolarity increased from 301. 68 ± 3. 59 ml/d to 313. 26 ±4. 87 mOsm/ kg. No adverse reaction was observed during the therapy. Conclusions Minirin is effective and safe in the therapy of postoperative transsphenoidal surgery patients with central diabetes insipidus.

Objective To investigate the effects of estrogen replacement therapy on the serum nitric oxide and endothelin-1 level of ovariectomized rat.Methods The ovariectomized animal model and estrogen replacement therapy rat were established,thirty female rats were randomly divided into three groups:group A,ovariectomy;group B,ovariectomy plus estrogen replacement therapy;group C,sham-ovariectomy.The rats were killed after two months.The serum nitric oxide and endothelin-1 level were determined.Results In group A,the serum nitric oxide level was lower as compared with group C,but the serum endothelin-1 level was higher than those in group C.In group B,the serum nitric oxide level was higher and the serum endothelin-1 level was lower than those in group A.Conclusions Estrogen could modulate the productions of the nitric oxide and the endothelin-1 in the vascular endotheliocytes and improve the function of the vascular endothelial cells,which may be a bases of the benificial effect of estrogen in the prevention of atherosclerosis.

Chemokine CXCL12 ; Child ; Humans ; Neoplasm Metastasis ; Neoplasms ; pathology ; Receptors, CXCR4

Objective To investigate expressions of STAT3 and phosphorylated STAT3(p-STAT3)in cutaneous malignant melanoma(CMM)lesions, and to explore their significance. Methods The expressions of STAT3 and p-STAT3 were detected with an immunohistochemical method using polymer enzyme-labeled secondary antibodies in skin specimens from 22 CMM lesions and 23 pigmented nevus lesions. The effects of STAT3 and p-STAT3 expressions on lymph node metastasis of CMM were evaluated. Results The expression rate of STAT3 was significantly higher in CMM lesions than in pigmented nevus lesions (95.5% vs. 56.5%, χ2 = 9.23, P < 0.05), so was that of p-STAT3 (90.9% vs. 43.5%, χ2 =11.38, P < 0.05). STAT3 expression in CMM lesions had no obvious effects on lymph node metastasis of CMM (P > 0.05), while the elevated expression of p-STAT3 in CMM lesions was a predictive factor for lymph node metastasis in CMM (OR = 1.88, 95% CI: 1.05 - 3.38, P < 0.05). Conclusion Increased expression of STAT3 and p-STAT3 in CMM may play important roles in the pathogenesis of CMM, and elevated p-STAT3 expression may contribute to invasion and metastasis of CMM.

Objective To investigate the effects of all -trans retinoic acid (ATRA),acitretin and tazarotene on apoptosis and active caspase-3 of human melanoma cells A375 and to discuss the relevant significance.Methods The effects of retinoids on apoptosis and active caspase-3 of A375 cells were examined in vitro.Early apoptosis analysis by double staining with annexin V-FITC and PI,and active caspase 3 analysis by the staining of FITC conjugated monoclonal rabbit anti active caspase-3 antibody were measured by flow cytometer.Results ATRA and acitretin induced apoptosis of A375 cells (both P＜0.05),but tazarotene was not effective (P＞0.05).ATRA and acitretin elevated the cell population with detectable active caspase-3 (both P＜0.05),but tazarotene was not effective either (P＞0.05).Acitretin played a most prominent role among the retinoids. Early apoptosis ratio was significantly and positively correlated with active caspase-3 percentage in both ATRA and acitretin (P＜0.05).Conclusions Acitretin and ATRA induce apoptosis of A375 cells in which caspase is critical.Retinoids are prospectively applied as an assisting alternative for treating melanoma.

No abstract available.
Humans ; Hyalin* ; Hyaline Membrane Disease* ; Infant, Newborn

No abstract available.
Humans ; Infant, Very Low Birth Weight* ; Critical Care*

No abstract available.
Blood Pressure* ; Humans ; Infant, Newborn*