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821.
Endoplasmic reticulum (ER) immunolabeling in developing stomatal complexes and in the intervening cells of the stomatal rows
(ICSRs) of Zea mays revealed that the cortical-ER forms distinct aggregations lining locally expanding wall regions. The polarized subsidiary
cell mother cells (SMCs), displayed a cortical-ER-patch lining the wall region shared with the inducing guard cell mother
cell (GMC), which disorganized during mitosis. In dividing SMCs, ER persisted in the preprophase band region and was unequally
distributed in the mitotic spindle poles. The subsidiary cells (SCs) formed initially an ER-patch lining the common wall with
the GMC or the young guard cells and afterwards an ER-ring in the junction of the SC wall with the neighboring ones. Distinct
ER aggregations lined the ICSR wall regions shared with the SCs. The cortical-ER aggregations in stomatal cells of Z. mays were co-localized with actin filament (AF) arrays but both were absent from the respective cells of Triticum turgidum, which follow a different morphogenetic pattern. Experimental evidence showed that the interphase ER aggregations are organized
by the respective AF arrays, while the mitotic ER aggregations by microtubules. These results revealed that AF and ER demarcated
“cortical cytoplasmic domains” are activated below the locally expanding stomatal cell wall regions, probably via a mechanosensing
mechanism triggered by the locally stressed plasmalemma/cell wall continuum. The probable role(s) of the local ER aggregations
are discussed. 相似文献
822.
Charles H. Washabaugh Katia Del Rio-Tsonis Panagiotis A. Tsonis 《Journal of morphology》1993,218(1):107-114
We describe a detailed histological analysis of the affected organs in the Short toes (s) mutation of the Mexican axolotl, Ambystoma mexicanum. The s mutant animals displayed a variation in the response to the mutation such as the time of death and the degree of abnormalities of the affected organs (limbs, kidney, ducts, and reproductive structures). In addition to the numerous histological abnormalities characterized here, we also examined the presence of laminin-related molecules in s mutant kidney tissues to elucidate further the nature of the renal aplasia these animals encounter as a result of this recessive lethal mutation. Our data suggest that there may be a disruption in tissue interactions necessary for proper development and functioning of the affected tissues. © 1993 Wiley-Liss, Inc. 相似文献
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When limb bud mesenchymal cells are cultured at high density, chondrogenesis takes place in vitro. Treatment of such cultures with the tumor promoter 12-O-tetradecanoyl phorbol 13-acetate (TPA) resulted in complete inhibition of chondrogenesis as indicated from staining the cultures for proteoglycans and from RNA hybridization to cDNA probes specific for four cartilage macromolecules. The effect of TPA varied depending on the initial plating density. At high density, TPA inhibited cell proliferation. At low density, cell proliferation was stimulated by TPA and above a certain cell density, chondrogenesis took place even in the presence of TPA. These results are interpreted to mean that the effect of TPA on chondrogenesis is indirect, possibly through its influence on cell proliferation. 相似文献