Dolichol delays G1-arrest for one cell cycle in human fibroblasts subjected to depletion of serum or mevalonate.
نویسندگان
چکیده
It is well-established that some product(s) or metabolite(s) of mevalonate is (are) critical for growth of mammalian cells. In the search for this (these) compound(s) it seems meaningful to distinguish between compounds needed for cell cycle progression in proliferating cells and compounds needed for growth activation of arrested cells. By using time-lapse video recording we have studied the possible regulatory role of cholesterol, dolichol and mevalonate in the cell cycle of human diploid fibroblasts (HDF). HDF, which are serum-dependent, were rapidly growth-arrested in the first part of G1 upon removal of serum factors. They also responded to mevinolin (an HMG CoA reductase inhibitor) by a similar G1-block, indicating that a mevalonate-derived product is involved in the G1-located cell cycle control of HDF. Interestingly, dolichol counteracted the G1-block caused by both types of treatment. Hence, the early G1-cells could traverse the remainder of the cell cycle and divide despite depletion of serum or mevalonate. We also demonstrated that addition of dolichol resulted in a significant decrease in the rate of protein degradation. This protein stabilizing effect may constitute the mechanism by which dolichol delays the G1-arrest of HDF.
منابع مشابه
G1 Phase Arrest and Apoptosis Induction in Human Thyroid Cancer Cell Line Thr.C1.PI33 by 3-Hydrogenkwadaphnin Isolated from Dendrostellera lessertii
Dendrostellera lessertii (Thymelaeaceae) is a toxic plant that grows in parts of Iran. The anti-proliferative properties of its crude methanol extract and one of its active components, 3-hydrogenkwadaphnin (3-HK), have been established using several cancer cell lines. Methods: In a further attempt to determine the mode of action, two groups of synchronously growing cells were treated with a sin...
متن کاملMevalonic acid products as mediators of cell proliferation in simian virus 40-transformed 3T3 cells.
Effects of treatment with serum-free medium and 25-hydroxycholesterol (25-OH) on the cell cycle of simian virus 40-transformed 3T3 fibroblasts, designated SV-3T3 cells, were studied and compared with simultaneous effects on the activity of 3-hydroxy-3-methylglutaryl (HMG) CoA reductase and incorporation of [3H]mevalonic acid into cholesterol, Coenzyme Q, and dolichol. The data confirm our previ...
متن کاملIn Vitro Cell Cycle Synchronization of Sheep Granulosa Cells
Purpose: To investigate the effect of different methods of synchronization on sheep granulosa cell cycle. Materials and Methods: Granulosa cells were aspirated from ovarian follicles and plated in a DMEM medium containing 15% FBS. Upon 70-80% confluency, the medium of the primarycultured as well as the passaged-5 cells were replaced with the medium containing either 0.5% FBS for 24, 48 and 72 h...
متن کاملHuman Lung Carcinoma Reaction against Metabolic Serum Deficiency Stress
Cancer treatment is still of the greatest challenges that health care providers and patients are facing. One of the unsolved problems in cancer treatment is cells’ reaction to metabolic stress caused by harsh nutritional conditions around tumor. In order to be able to treat this disease properly, it is important to understand the true nature of the disease. In fact, the cells inside the central...
متن کاملHuman Lung Carcinoma Reaction against Metabolic Serum Deficiency Stress
Cancer treatment is still of the greatest challenges that health care providers and patients are facing. One of the unsolved problems in cancer treatment is cells’ reaction to metabolic stress caused by harsh nutritional conditions around tumor. In order to be able to treat this disease properly, it is important to understand the true nature of the disease. In fact, the cells inside the central...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Journal of cell science
دوره 103 ( Pt 4) شماره
صفحات -
تاریخ انتشار 1992