The nurse cells produce substances that are passed into the maturating oocyte.
The nuclei of the nurse cells show numerous impregnated nuclear regions and the intensity and number of regions impregnated by the silver varies according to the stage of oogenesis or oocyte development.
In any stage, the nurse cells present large nuclear masses of thread-like eletrondense material disperse in the nucleoplasm and attached to the nuclear envelope (Figure 3c); as these masses increase in size and number, the nuclei becomes irregular.
Thus, all the RNA and RNP present in the oocyte that will used at the beginning of embryogenesis would be produced in the nurse cells which are clones of the oocyte.
It is noteworthy that many nurse cells burst (apoptosis?
The development of a mechanism by which the sponge nurse cells collect and choose the endosymbiotic bacteria, cyanobacteria, and yeasts to be vertically transmitted to the next sponge generation is evidence of the mutualistic character of this relationship.
One of these interstitial cells forms an oocyte that increases in mass by engulfing or fusing with large numbers of the remaining interstitial cells, referred to as nurse cells.
The nurse cells engulfed by the developing oocyte during oogenesis remain in the egg throughout embryogenesis as spherical, refractile cells with pycnotic nuclei (Zihler, 1972; Honegger et al.
Each cell is filled with about 40 nurse cells [ILLUSTRATION FOR FIGURE 11 OMITTED].
There are nurse cells in all blastomeres, although many more in the cells of the inner cell mass [ILLUSTRATION FOR FIGURE 12 OMITTED].
20The decrease in VEGF level in the peripheral blood of PIH patients suggests that VEGF affects the differentiation and proliferation of nurse cells
causes invasive functional disorder of nurse cells
and affects the physiological changes of spiral arterioles.
As the nurse cells
made exu, they also made fluorescing protein, lighting up this exu, the researchers report in the June 2 NATURE.