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Spermatogenesis

Spermatogenesis

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 reproductive...

Spermatogenesis

Spermatogenesis

Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
The process of spermatogenesis can be divided into mitosis, meiosis, and spermiogenesis. During mitosis, the spermatogonia or stem cells divide to produce two identical daughter cells, type A and B spermatogonia. Type-A...

Cell Migration

Cell Migration

Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.

Cell Migration

Cell Migration

Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.

Sperm Transport

Sperm Transport

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...

Gastrulation

Gastrulation

Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata will form...

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Isolation of Sertoli Cells and Peritubular Cells from Rat Testes

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Published on: February 8, 2016

La migración de las células germinales a través de las uniones estrechas de las células de Sertoli.

Benjamin E Smith¹, Robert E Braun

¹Department of Genome Sciences, University of Washington School of Medicine, Seattle, WA 98195, USA.

Science (New York, N.Y.)

|September 22, 2012

Resumen

Las células germinales atraviesan la barrera sangre-testículos formando compartimentos transitorios sellados por nuevas uniones estrechas. Estas uniones incorporan temporalmente la claudina 3 antes de que la claudina 11 la reemplace, asegurando la integridad de la barrera.

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Área de la Ciencia:

Biología de la reproducción Biología reproductiva.
Biología celular Biología celular.
Inmunología Inmunología.

Sus antecedentes:

La barrera sangre-testículos (BTB) está formada por las uniones estrechas de las células de Sertoli, cruciales para la función reproductiva masculina y el privilegio inmunológico.
Impide que las sustancias nocivas entren en los túbulos seminiferos y protege el desarrollo de las células germinales.

Objetivo del estudio:

Para investigar los cambios dinámicos en las uniones estrechas de las células de Sertoli (SCTJs) durante la migración de las células germinales.
Para dilucidar los mecanismos moleculares subyacentes al paso de los quistes de células germinales a través de la BTB.

Principales métodos:

Se empleó microscopía confocal para visualizar los componentes estructurales de los SCTJ.
El estudio rastreó el comportamiento de las proteínas de unión apretada durante el tránsito del quiste de la célula germinal.

Principales resultados:

Los quistes de células germinales migran formando compartimentos transitorios delimitados por viejas y nuevas uniones estrechas.
La claudina 3 se integra transitoriamente en las uniones estrechas recién formadas durante este proceso.
Posteriormente, la claudina 11 reemplaza a la claudina 3, restaurando la estructura madura de unión apretada.

Conclusiones:

El tránsito de células germinales a través de la BTB es un proceso dinámico que mantiene la integridad de la barrera.
La incorporación secuencial y el reemplazo de las claudinas (3 y 11) son claves para controlar la permeabilidad del SCTJ durante la migración de las células germinales.