肺中的精子发生,欧哈德拉·希科尼斯III. 旗组织的形成
1Biological Institute, Ehime University, Matsuyama 790, Japan.
Development, growth & differentiation
|June 7, 2023
概括
这项研究详细介绍了日本陆地牛精子体的复杂鞭毛形成,揭示了中心球.
科学领域:
- 细胞生物学 细胞生物学
- 精子生成研究 精子生成研究
- 软体动物繁殖 软体动物繁殖
背景情况:
- 鞭子发育对于精子运动和受精至关重要.
- 了解鞭毛组装的精确机制,为细胞形态发生提供了洞察力.
- 日本陆地牛Euhadra hickonis作为研究无脊椎动物精子生成的模型.
研究的目的:
- 为了阐明Euhadra hickonis精子的鞭子形成的详细过程.
- 描述精子生成过程中中心点和相关组件的结构变化.
- 描述轴膜,线粒体衍生物和延长的鞭毛体内的糖原的发展.
主要方法:
- 使用传输电子显微镜可视化精子发生过程中的超结构变化.
- 对核,中心点,轴膜和鞭毛组成部分进行了详细的形态分析.
- 在整个精子体分化阶段进行了比较观察.
主要成果:
- 鞭子的形成始于核缩和中心点重新定位到植入穴中.
- 中心体经历了显著的结构变化,形成了一个带有密集的盖子和改变微管的安排的基底体.
- 发育的鞭毛体具有一个复杂的修饰的线粒体 (主要和次要) 和环绕轴心体的糖原颗粒的复杂外.
结论:
- 这项研究提供了对Euhadra hickonis. flagellar组装的全面超结构性解释.
- 中心点,核和细胞质成分之间的复杂相互作用对于适当的鞭毛形成至关重要.
- 专门的线粒体衍生物和糖原储存突出了精子功能和能量供应的适应.
相关概念视频
01:41Spermatogenesis
102.7K
Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male...
102.7K
01:27Diversity of Protists IV
49
Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
49
01:38Fertilization
71.2K
During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
71.2K
01:39Mechanism of Filopodia Formation
2.4K
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
2.4K
01:05Mechanism of Ciliary Motion
3.7K
The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
3.7K
01:15Sperm Transport
986
The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
The maturation phase occurs in the epididymis, where sperm...
The maturation phase occurs in the epididymis, where sperm...
986