摘要
去分化是发育生物学和形态学领域一个古老又常新的现象,既往研究多注重去分化和肿瘤发生的关系。我们的系列研究发现去分化和细胞组织损伤再生有着重要和必然的联系,在周围神经损伤再生中发现局部有大量施万细胞通过自噬机制吞噬消化自身髓鞘成分和衰老的细胞器,同时以胞质脱落的方式芽生出部分胞质脱落体,细胞内含大量游离核糖体和多聚核糖体等原始细胞器,保留极少量有活力的线粒体和高尔基体,呈现去分化后的幼稚化状态。在长春新碱诱导L02(肝细胞株)细胞损伤实验中发现L02细胞中有大量的自噬体,细胞周围也出现大量发芽脱落后游离于细胞外的胞质脱落体,细胞耐过之后呈现幼稚化,我们也称之为去分化。细胞经过去分化减轻代谢负担,清除衰老和受损的细胞器,恢复活力,接着大量增殖以修复重建损伤组织。在当前大部分科研人员一致看好干细胞在组织损伤再生中的重要作用的背景下,本研究根据长期观察实践,提出成熟细胞去分化幼稚化参与再生重建的观点,以供同行专家讨论。
Dedifferentiation is an important event in developmental biology and morphology but frequently neglected by the biologists. In the past, attention was given predominantly to its relationship with tumorigenesis. In our series of researches, we found important and inherent relations between dedifferentiation and regeneration of damaged cells and tissues in the emergence of large numbers of Schwarm cells that digested their own myelin sheath components and senescent organelles by autophagic mechanism during regeneration of the peripheral nerves following injuries, when some apocytosomes (apo+cyto+sis), by means of apocytosis (apo+cyto+sis), budded from the cells containing such primitive organelles as free ribosomes and polyribosomes and retaining a very small quantity of active mitochondria and Golgi apparatus, all characterizing an immature state of the cells after dedifferentiation. Many autophagic bodies were found enwrapped by membranes L02 cells (a liver cell line) after vincristine-induced damage, with numerous apocytosomes dissociated following budding around the cells. The cells survived the treatment presented immature appearance, a phenomenon we termed as dedifferentiation, after which the metabolic burden of the cells was relieved, the senescent and damaged organelles were cleared, and the cells resumed their viability and proliferated vigorously to repair and reconstruct the damaged tissues. As most researchers have currently give their full attention to the important role of stem cells in the regeneration of damaged cells and tissues, we, after long-term observations and experiments, propose that mature cells also take part in the regeneration and reconstruction process after dedifferentiation.
出处
《第一军医大学学报》
CSCD
北大核心
2004年第7期736-737,共2页
Journal of First Military Medical University
基金
国家自然科学基金(30300191
39870382)
广东省自然科学基金(032898)~~
关键词
去分化
自噬
胞质脱落
胞质脱落体
再生
dedifferentiation
autophagy
apocytosis
apocytosome
regeneration
