ABSTRACT
The stem cell biology plays an important role in the application and research of the clinical medicine and biology. The breakthrough of the therapies for a variety of human diseases depends on the rapid growth of stem cell biology. It is of great significance to set up graduate curriculum of stem cell biology in the medical college. This article elaborates the design and implementation of the course of Stem Cell Biology including the selection of the teaching materials, design of course outline, teaching content, evaluation methods, teaching introspection and other aspects, thus providing references and communications in this field.
ABSTRACT
Objective To explore the clinical features and sum up the laws of the hepatic focal nodular hyperplasia (FNH) in its diagnosis and treatment. Methods FNH was an uncommon benign hepatic tumor that often posed diagnostic dilemmas. We analyzed retrospectively the clinical, imaging of ultrasound, imaging of computed tomography (CT) and magnetic resonance images (MRI), and pathological materials of 21 patients with FNH proven by the pathological diagnosis during 5 years from April 1996 through April 2001 in two hospitals. Results The diagnosis of FNH remained a challenge for clinicians and surgeons. Rate of correct diagnosis of FNH was low preoperatively (19.0%). The lesions of FNH were seen in males and females (m/f: 14/7). Only three female patients (3/7) had the history of taking oral contraceptive. Patients with FNH were largely young and middle age persons (81.0% under 50 years), discovered by accident (57.1%), without infection of the hepatitis B virus (95.2%) and with normal liver functions (100%) and serum AFP levels (100%). Color Doppler ultrasound showed blood vessels passing through the lesion (80.0%) and there was abundant in blood (66.7%). CT scan showed that the lesion had transient immediate enhancement in 60.0% of patients and had homogeneous signal in 60.0% after bolus injection. MR imaging demonstrated early vigorous enhancement (64.3%), homogenous signal (57.1%) and having central scar (35.7%) in the lesion. The demonstration of a central scar in the lesion was very helpful for the diagnosis of FNH. MRI was more helpful for the diagnosis of FNH using liver specific contrast agents: superparamagnetic iron oxide(SPIO). All patients underwent focus resection (18 cases) or segmentectomy (2 cases), except one having no treatment. Conclusion FNH shows some typical clinical and imaging features. We could increase the rate of correct diagnosis by comprehensively analyzing the clinical and imaging materials. It is very important and necessary to determine a definite diagnosis of FNH, hepatic adenoma (HA) and primary liver cancer (PLC) preoperatively, because the HA and PLC must be surgically resected, FNH can only be followed up.
ABSTRACT
<p><b>OBJECTIVE</b>To clone a novel liver cancer associated gene, and to explore the molecular basis of liver cancer genesis.</p><p><b>METHODS</b>Using mRNA differential display polymerase chain reaction (DDPCR) and screening the human placenta cDNA library, we got a full-length cDNA of the gene. We prepared and purified the GST fusion protein and the special polyclonal antibody, engaged in the Western blot and immunohistochemical staining analysis, and analyzed the second structures and predicted the function of the protein by the computer soft.</p><p><b>RESULTS</b>We have got a full-length cDNA of the liver cancer associated gene and identified that the full-length cDNA of the gene could be expressed in 293 eukaryocytes by Western blot assay. We localized the target protein in cytoplasm using the immunohistochemical staining methods, and found two SH3 binding domains and several protein kinase phosphorylation sites by analyzing the second structures.</p><p><b>CONCLUSIONS</b>We have got a novel full-length cDNA of human liver cancer associated gene.</p>
Subject(s)
Humans , Amino Acid Sequence , Cell Line , Cloning, Molecular , Cytoplasm , Chemistry , DNA, Neoplasm , Gene Expression Profiling , Methods , Gene Expression Regulation, Neoplastic , Gene Library , Liver Neoplasms , Genetics , Molecular Sequence Data , Neoplasm Proteins , Chemistry , Genetics , Nuclear Proteins , Phosphorylation , Polymerase Chain Reaction , Methods , Protein Structure, Secondary , Proteins , Chemistry , Genetics , Recombinant Proteins , Chemistry , Genetics , Trans-Activators , Transcription FactorsABSTRACT
Objective To clone a new liver cancer associated gene, and to explore the molecular basis of liver cancer genesis. Methods Using mRNA differential display polymerase chain reaction (DDPCR), we investigated the difference in mRNA expression between primary hepatocellular carcinoma and paracarcinoma liver tissue, and achieved a gene probe. The target gene expression was proved in parent tissue by Northern blot. Screening the placenta cDNA library, we got a full length cDNA of this gene. By GST fusion protein methods, we prepared the special polyantibody of C end of the gene. We identified the polyantibody and the expression of this gene by Western blot method. Results We obtained a full length cDNA of proline riched cancer associated gene, and we have prepared the specific polyantibody of this gene. Conclusion The obtaining of a novel liver cancer associated gene and successful preparation of the polyantibody pave the way for further study on gene therapy for liver cancer.