The altered pattern in the expression of keratin proteins as a function of tumour progression was studied in the hamster cheek pouch and compared the changes with electron microscopic observations using DMBA as a carcinogen. In the case of hyperplasia and well developed tumours a conspicuous loss of 67 K and an increase in 46 K was observed compared to the controls. The increased expression of low molecular weight keratins during tumour growth is well supported by the enhanced expression of tonofilament bundles, electron microscopically. This study suggests a triangular relationship between the presence of low molecular weight keratins-enhanced expression of tonofilament bundles and the undifferentiated nature of the oral tumours.
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http://dx.doi.org/10.1016/0309-1651(88)90031-8 | DOI Listing |
Pharmaceutics
December 2024
National Institute of Gastroenterology S. De Bellis, IRCCS Research Hospital, Via Turi 27, 70013 Castellana Grotte, BA, Italy.
Background/objectives: KRT23 was recently discovered as an epithelial-specific intermediate filament protein in the type I keratin family. Many studies have underlined keratin's involvement in several biological processes as well as in the pathogenesis of different diseases. Specifically, KRT23 was reported to affect the structural integrity of epithelial cells and to trigger cellular signaling leading to the onset of cancer.
View Article and Find Full Text PDFCancers (Basel)
December 2024
Legorreta Cancer Center, The Warren Alpert Medical School, Brown University, Providence, RI 02912, USA.
The epithelial-mesenchymal transition (EMT) program is critical to metastatic cancer progression. EMT results in the expression of mesenchymal proteins and enhances migratory and invasive capabilities. In a small percentage of cells, EMT results in the expression of stemness-associated genes that provide a metastatic advantage.
View Article and Find Full Text PDFBiology (Basel)
November 2024
Institute of Protein Research, Russian Academy of Sciences, 119334 Moscow, Russia.
Neural precursor cells contain two types of intermediate filaments (IFs): neurofilaments consisting of three IV type proteins and vimentin belonging to the type III IF proteins that disappear at the later stages of differentiation. The involvement of vimentin in neurogenesis was demonstrated earlier; however, the role of its temporary expression in neurons is not clear. We showed that the vimentin IFs that interacted with mitochondria maintained their membrane potential at the appropriate level, and thus, ensured their proper function.
View Article and Find Full Text PDFPol J Vet Sci
December 2024
Department of Histology and Embryology, Faculty of Veterinary Medicine, University of Dicle, 21280 Diyarbakır, Turkey.
Intermediate filaments (IFs) play a major role in determining and maintaining cell shape and anchoring intracellular organelles in place, in the tissues and organs of several species, starting from the early stages of development. This study was aimed at the immunohistochemical investigation of the presence, cellular localization and temporal distribution of the intermediate filaments keratin 8 (CK8), keratin 18 (CK18), keratin 19 (CK19), vimentin, desmin and laminin, all of which contribute to the formation of the cytoskeleton in the rat mammary gland during pregnancy, lactation and involution. On days 7, 14 and 21 of pregnancy (pregnancy period), on day 7 post-delivery (lactation period) and on day 7 post-weaning (involution period), under ketamine hydrochloride (Ketalar-Pfizer) (90 mg/kg) anesthesia, two mammary glands were fully excised from the abdominal region.
View Article and Find Full Text PDFCells
November 2024
Division of Oral Biotechnology, Center for Dental Medicine, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Hugstetterstr. 55, 79106 Freiburg, Germany.
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