BACKGROUND: Clinical studies have discovered heart rate variability (HRV) is closely correlated with autonomic nervous system, sub-health and sudden death. Medical studies have summarized some chaotic medical science and homeostasis relevance theory. But so far the combination could still not systematically explain the clinical manifestation or summarize the diagnostic standards for sub-health and effective index to prevent sudden death. OBJECTIVE: To elucidate the correlation among autonomic nervous system, sub-health and sudden death by using chaotic medicine and homeostasis, so as to provide theoretical basis for evaluating sub-healthy state using HRV and preventing sudden death HRV. RETRIEVAL STRATEGY: A computer-based online search of Pubmed was undertaken to identify the articles published in English between January 1995 and June 2007 with the keywords of "chaotic medicine, heart rate variability (HRV), Sudden death, Sub-health, homeostasis". Meanwhile, the Weblog and CNKI database were searched for relevant articles dated from January 1995 and June 2007 with the same keywords in Chinese. Fifty-six papers were searched. After the first trial, only articles ①closely correlated with chaotic medical science, sudden death and sub-health, and ②published recently or in authority magazine in same field were selected. Repetitive studies were excluded. LITERATURE EVALUATION: The review articles, basic and clinical experiments about chaotic medical science, HRV, sudden death, sub-health, and homeostasis as well as articles published in related weblogs were selected. DATA SYNTHESIS: ①In any individual composed of multi-cells and multi-system, there are at least three-level chaotic system: overall chaotic system, cardiovascular chaotic system maintaining the blood pressure and cell chaotic system. Healthy state is that the three chaotic systems are in normal condition. Disease and sub-healthy state is the sub-stable state of chaotic system caused by the overstress of central nervous system, overexcitation of autonomic nerves and HRV decrease when there is some cell or cardiovascular system malfunction, and the information is feedback to central nervous system. ②Based on the theory about chaotic medicine and homeostasis, there are four states in individual chaotic motion: health, disease, sub-health, and homeostasis border before sudden death. The health is the homeostasis of body; disease and sub-health are the sub-homeostasis and may develop from healthy state because various factors; they may transform each other and both of them may lead to sudden death for unsteady. ③The extreme tension of central nervous system and over-excitation of autonomic nerves result in the destabilizing overall chaotic motion. Stimulation induces system destabilizing and sudden death because the patient cannot maintain arterial blood pressure. CONCLUSION: Long-term healthy state is unpredictable, but we can forecast 1-2 days situations by short-term HRV testing for 512 times in the early morning of every day, and judge the healthy state after sleep, and the change tendency of healthy state. Accordingly, we could predict person is in healthy state, sub-healthy state or unsteady border state that could cause sudden death.

BACKGROUND: Adipose-derived mesenchymal stem cells (ADSCs) can be induced toward the chondrogenic lineages with chondrogenic medium contained transforming growth factor-β_1(TGF-β_1). However, it remains concerned about the disadvantage with use of TGF-β_1 in vitro, which can induce chemotaxis, activate inflammatory cells, cause local defect and want an ideal matrix to deliver proteins. Therefore, with advanced gene-delivery techniques, TGF-β_1 can be long-lasting expressed by transduced stem cells, which is very useful for Chondrogenic Tissue Engineering.OBJECTIVE: To master the method of construction and transfection of eukaryotic expression vector for rat transforming growth factor-β_1 and to study the possibility of gene transfection to ADSCs with this vector.METHODS: Recombining DNA techniques were applied to construct recombinant plasmid pcDNA3.1-TGF-β_1. And this plasmid was verified by restriction endonuclease mapping and DNA sequencing; Then the plasmid with TGF-β_1 gene or not was transfected into ADSCs by use of LipofectamineTM2000. After infection, transduced ADSCs were diluted and cultured with neomycin (G418). Gene transfer efficiency compared on the basis of green fluorescent protein expression was assessed.RESULTS AND CONCLUSION: Digestion of the plasmid with double restriction endo- nuclease XboⅠand Hind Ⅲ showed about two specific electrophoretic strips (1.35 bp and 5.4 kb), and the sequence of the rat TGF-β_1 gene in recombinant was concorded with that reported in Genbank. There were 80 percent of the cells which were transduced, and the expressions of mRNA and protein of TGF-β_1 in ADSCs were discovered positively. These indicated that the eukaryotic expression vector for rat TGF-β_1 (i.e. pcDNA3.1-TGF-β_1) , which is able to transfect the ADSCs, can be constructed through genetic recombination.