Hypoxia-responsive factor PHD2 and angiogenic diseases / 药学学报

Prolyl-4-hydroxylase domain (PHDs) family is one of the most important regulatory factors in hypoxic stress. PHD2 plays a critical role in cells and tissues adaptation to the low oxygen environment. Its hydroxylation activity regulates the stability and transcriptional activity of the hypoxia-inducible factor 1 (HIF-1), which is the key factor in response to hypoxic stress. Subsequently, PHD2 acts as an important factor in oxygen homeostasis. Studies have shown that PHD2, through its regulation on HIF-1, plays an important role in the post-ischemic neovascularization. Furthermore, under hypoxic condition, PHD2 also regulates other pathways that positively regulate angiogenesis factors HIF-1 independently. Moreover, recently, several evidences have also shown that PHD2 also affects tumor growth and metastasis in a tumor microenvironment. Based on these facts, PHD2 have been considered as a potential therapeutic target both in treating ischemic diseases and tumors. Here, we review the molecular regulation mechanism of PHD2 and its physiological and pathological functions. We focus on the role of PHD2 in both therapeutic angiogenesis for ischemic disease and tumor angiogenesis, and the current progress in utilizing PHD2 as a therapeutic target.

The therapeutic effect of psychological intervention combined with electroacupuncture and hyperbaric oxygen therapy on patients with depression after traumatic brain injury / 中华物理医学与康复杂志

Objective To investigate the effect of psychological intervention combined with electroacupuncture and hyperbaric oxygen therapy on patients with depression after traumatic brain injury (TBI). Methods Forty-five patients with depression after TBI were randomly divided into a treatment group and a control group. The two groups were both treated with routine medication and anti-depression drugs ( Fluoxetine ) for 8 weeks as a routine course of treatment, but psychological intervention combined with electroacupuncture and hyperbaric oxygen therapy was added to the treatment group's regimen. Hamilton Depression Scale ( HAMD), Modified Edingberg Scandinavian Stroke Scale (MESSS) and Quality of Life-index (QL-INDEX) scores were evaluated at the end of 8 weeks.Results There was no significant difference in the average HAMD, MESSS or QL-INDEX scores of the two groups before therapy. After treatment, the average HAMD and MESSS scores of the treatment group were significantly lower than those of the control group, and the average QL-INDEX score was significantly higher. Conclusions Psychological intervention combined with electroacupuncture and hyperbaric oxygen therapy plays an important role in the treatment of patients with depression after TBI to improve their mental status, treatment effectiveness and quality of life.

Clinical analysis of 70 patients with contusive hyphema / 中国基层医药

Objective To investigate the more effective treatment for contusive hyphema through analysis of clinical data. Methods Clinical data on 70 eyes of contusive hyphema were analyzed. Early stop bleeding and combined modality therapy was put in practice,and surgical treatment should be done when secondary glaucoma and secondary keratohemia was occurred. Results The hyphema was absorbed in 62 eyes. 6 eyes with secondary glaucoma and 2 eyes with secondary keratohemia took place which were done by surgical treatment and intraocular pressure were normal and cornea was almost clear after surgical treatment. Conclusion For contusive hyphema,early stop bleeding, promoting hemorrhage absorption etc was key treatment. For patients with severe complications such as secondary glaucoma,secondary keratohemia,surgical treatment should be done in time. The effect of treatment was satisfied.

Clinical study of retrograding excision of pterygium with amniotic membrane transplantation / 中国基层医药

Objective To observe the effect of retrograding excision of pterygium with amniotic membrane transplantation on the prevention of pterygium relapse. Methods Conjunctival incisions were made along both sides of pterygium body. The conjunctiva was then seperated from the underlying peterygium tissue and cut at the site of pterygium body. It was further seperated from the underlying pterygium tissue toward the caruncle so that the peteygium tissue could be exposed,which was seperated from the sclera and then was excised at the sit of the plica semilunaris and seperated from the cornea retrogradingly. The exposed sclera was then covered by transplanted amniotc membrane. Results After 6-18 months of follow-up,12 eyes in 65 eyes of pterygium relapsed. Conclusion Retrograding excision of pterygium with amniotic membrane transplantation could significantly decrease the relapse of pterygium.

Application of endothelial progenitor cells in vascular tissue engineering / 生物医学工程学杂志

Endothelial progenitor cells (EPCs) are immature endothelial cells which have the capacity to proliferate, migrate and differentiate into mature endothelial cells from bone marrow to the peripheral circulation. EPCs have been shown to participate in postnatal endothelial repair and neovascularization of ischemic organs, and have been used as a new source of seeded cells in vascular tissue engineering. In this review, we focus on the origin, identification, property and function of EPCs as well as their application in vascular tissue engineering.

Study on biomechanical properties of several scaffold materials for tissue engineering / 中国组织工程研究

BACKGROUND:It is still a research focus on constructing substitution of the human tissues and organs, or producing the alliance for grafting by engineering methods in tissue engineering. Among these researches, it is pivotal to choose appropriate materials. The prepared scaffolds should have suitable tensile strength and mechanical toughness to withstand the various outside forces without being damaged. So, it is very necessary to evaluate the biomechanical properties of candidated materials in tissue engineering, which can supply the references for selecting materials for tissue scaffolds and their designation.OBJECTIVE: To investigate the biomechanical properties of nine kinds of scaffold materials, in order to supply a biomechanical basis for the selection and design of scaffold materials for tissue engineering.DESIGN: A repetitive measurement study.SETTING: College of Bioengineering, Chongqing University.MATERIALS: The materials involved in this study were poly (DL-lactic-co - glycolic acid) (PLGA), sodium polymannuronate, gelatine, chitosan, collagen, acellular porcine dermis (APD), acellular vascular matrix (AVM),APD-PLGA, AVM-PLGA, modified gelatine and chitosan.METHODS: All the experiments related to this study were completed in the Biorheology laboratory of the College of Bioengineering, Chongqing University from April 2006 to March 2007. The nine materials above were prepared, gelatine and chitosan were modified. Stress-strain testing was performed at 10 mm per minute by a material testing machine (INSTRON 1011, USA). The Yang's modulus was calculated in the range of 0.005 to 0.02, the ultimate strain and stress were also obtained.MAIN OUTCOME MEASURES: The ultimate strain, ultimate stress and Yang's modulus of the nine materials were analyzed.polymannuronate ＞ AVM-PLGA ＞ collagen ＞ gelatine (P ＜ 0.05). The rate of burst straining of chitosan and PLGA were greater than those of other materials, 133% and 276% respectively (P ＜ 0.05). In addition, after being combined with ultimate stresses of APD and APD-PLGA were greater than that of other materials, i.e., their burst strengths were greater than those of other materials. The data also indicated that the burst strength of APD-PLGA was a little greater than that of APD (P ＞ 0.05). The burst strengths of gelatin, chitosan, and collagen were similar at the range of 7.67 to 9.51 MPa (P ＞ 0.05). The burst strengths of collagen and sodium polymannuronate were from 1.16 to 1.40 MPa, which were the least among all the materials. At the same time, being combined with PLGA, the burst strength of AVM-PLGA greatest, i.e., its rigidity was the greatest. The rigidity of APD was the least. After combined with PLGA, the rigidity of AVM and APD were increased (P ＜ 0.05), and corresponded with PLGA (P＞ 0.05). Except for gelatin, the order of rigidity in the materials was AVM-PLGA ＞ PLGA ＞ APD-PLGA ＞ AVM ＞ chitosan ＞ sodium polymannuronate ＞ collagen ＞ APD.CONCLUSION: AVM and APD have good biomechanical properties, which are very different from the water-soluble collagen. It is promising to improve the biomechanical properties of sodium polymannuronate, gelatin and chitosan by the complex of PLGA.