Search PubMed⌕ Search

Biomedical subjects

V Bertagnolo

Publications and source records attributed to V Bertagnolo.

32 records · Page 2Linked to original sources
PubMed1992

Discrete subcellular localization of phosphoinositidase C beta, gamma and delta in PC12 rat pheochromocytoma cells.

Phosphoinositidase C activity was revealed in nuclei isolated from PC12 rat pheochromocytoma cells incubated with tritiated phosphatidylinositol, phosphatidylinositol 4-phosphate and phosphatidylinositol 4,5-bisphosphate. Phosphoinositide breakdown was found to be optimal at neutral pH and Ca++ concentrations ranging from endogenous levels to millimolar values. To characterize the enzymes involved, three monoclonal antibodies directed against the beta, gamma and delta phosphoinositidase C isoforms were employed. A combination of Western blot immunochemical analysis on cytoplasmic and nuclear fractions and of in situ immunocytochemistry on intact cells and isolated nuclei indicated that phosphoinositidase C gamma, though predominantly cytoplasmic, was present in both cell compartments. On the contrary, phosphoinositidase C beta was exclusively localized in the nucleus, whereas phosphoinositidase C delta was restricted to the cytoplasm. These data suggest that inositol lipid breakdown is controlled by different phosphoinositidase C isozymes in the various cell compartments, and support the notion that a separate phosphoinositide signalling system is located in the nucleus.

Animals↗
PubMed1992

Nuclear localization and signalling activity of phosphoinositidase C beta in Swiss 3T3 cells.

The hydrolysis of phosphatidylinositol 4,5-bisphosphate (PtdInsP2) is a widespread receptor-coupled signalling system at the plasma membrane of most eukaryotic cells. The existence of an entirely separate nuclear phosphoinositide signalling system is suggested from evidence that purified nuclei synthesize PtdInsP2 and phosphatidylinositol 4-phosphate (PtdInsP) in vitro and that a transient decrease in the mass of these lipids occurs when Swiss 3T3 cells are cultured in the presence of insulin-like growth factor-1 (IGF-1). These IGF-1-dependent changes in inositol lipids coincide with an increase in nuclear diacyglycerol and precede translocation to the nucleus and activation of protein kinase C (refs 5, 6). Circumstantial evidence that links these changes with mitosis comes from the isolation of a 3T3 clone that expresses the type-1 IGF receptor and binds IGF-1 peptide but does not respond mitogenically or show transient mass changes in nuclear inositol lipids. A key question is how IGF-1 initiates the rapid breakdown of PtdInsP and PtdInsP2 in the nucleus. Here we present evidence that nuclei of 3T3 cells contain the beta-isozyme of phosphoinositidase C, whereas the gamma-isozyme is confined to the cytoplasm and that IGF-1 treatment stimulates exclusively the activity of nuclear phosphoinositidase C.

3T3 Cells↗
PubMed1992

Increased phosphorylation of nuclear substrates for rat brain protein kinase C in regenerating rat liver nuclei.

Protein phosphorylation catalysed by rat brain protein kinase C (PKC) has been studied in nuclei isolated from normal and regenerating rat liver. Histone H1 and a 40,000 molecular weight protein were hyperphosphorylated at all the explored regeneration times, ranging from 3 to 22 h after partial hepatectomy. Phosphorylation of the two substrates was totally dependent on calcium and lipids and was abolished by low concentration of staurosporine. The observed early change of phosphate content of histone H1 and of the 40,000 molecular weight protein on the time scale of liver regeneration suggests that PKC might be involved in the initial nuclear events leading to cell proliferation.

Animals↗
PubMed1991

Inositol lipids in Friend erythroleukemia cells: evidence for changes in nuclear metabolism after differentiation.

The incorporation of 32Pi into phospholipids was studied in Friend erythroleukemia cells either induced or not to erythroid differentiation with 4 mM hexamethylenebisacetamide (HMBA). The effect of the differentiating agent on the recovery of radiolabelled phospholipids was compared in whole cells, isolated nuclei and nuclear matrix after in vivo labelling for 1 hr. The procedure employed for the isolation of nuclei was demonstrated to allow only negligible lipid redistribution caused by cell manipulations. Among the lipids extractable from nuclei, acidic phospholipids, and particularly polyphosphoinositides, were more represented than in whole cells, while small differences were found in the other phospholipid classes examined. The comparison between the uninduced and induced condition showed that the relative amounts of nuclear inositol lipids were modified by HMBA treatment of the cells, with a decreased recovery of phosphatidylinositol 4,5 bisphosphate. These results indicate that phosphatidylinositol and its phosphorylation products synthesized in vivo show a different metabolism in nuclei and whole cells. They appear to be tightly bound nuclear components, also present in membrane-deprived nuclei and nuclear matrix, and are probably related to the nuclear events involved in erythroid differentiation.

Acetamides↗
PubMed1991

In vitro phosphorylation of lamin B by protein kinase C in friend erythroleukemia. Effect of chemically induced differentiation.

Nuclear matrix isolated from murine erythroleukemia cells (Friend cells) has been phosphorylated with gamma 32P-ATP and purified protein kinase C in order to identify specific nuclear substrates for the enzyme. HMBA has been employed to induce the cell to differentiate and to compare the changes of phosphorylation profile after erythroid differentiation. Lamin B has been found to be hyperphosphorylated by rat brain PK-C in nuclear matrix purified from uninduced cells. This difference characterizes the cells from 14 to 72 hrs of HMBA treatment and indicates that the ability of lamin B to be phosphorylated by PK-C is linked to the differentiated state. The involvement of PK-C in lamin phosphorylation might represent an early step of the signalling pathway utilized by erythroid differentiating agents to target the cell nucleus.

Acetamides↗
PubMed1990

Uptake and phosphorylation of phosphatidylinositol by rat liver nuclei. Role of phosphatidylinositol transfer protein.

The incorporation of phosphatidyl[2-3H]inositol ([3H]PI) from vesicles or microsomal membranes into rat liver nuclei is greatly stimulated by phosphatidylinositol transfer protein (PI-TP). The nuclei are able to phosphorylate [3H]PI, with the production of phosphatidylinositol 4-phosphate (PIP). Recovery of tritiated inositol trisphosphate, inositol phosphate, glycerophosphoinositol and inositol, suggests that in isolated nuclei a large set of enzymes of the PI cycle is present, similar to the enzymes involved in the plasma membrane PI cycle. Incubation with [gamma-32P]ATP shows that isolated nuclei are able to phosphorylate endogenous PI to PIP and phosphatidylinositol 4,5-bisphosphate (PIP2). In the presence of exogenous PI and detergent the synthesis of PIP is increased, indicating that in nuclei the PI pool is suboptimal for the PI-kinase activity. The present study suggests that PI-TP may be involved in providing substrates for PI metabolism at the nuclear level.

Animals↗
PubMed1990

Nuclear inositol lipids in Friend erythroleukemia cells. Changes related to differentiation induced by hexamethylenebisacetamide.

Subcellular distribution of inositol lipids has been studied in Friend Erythroleukemia Cells following induction to erythroid differentiation with hexamethylenebisacetamide, after labelling with [3H]myo-inositol. In situ autoradiography indicated that inositol-derived molecules were present also in the nuclear compartment of uninduced and induced cells. Fractionation studies showed that the nuclear polyphosphoinositides were deeply changed after short induction times, while the whole cell inositol lipids resulted only slightly modified by the inducer. The nuclear recovery of phosphatidylinositol 4,5-bisphosphate was largely increased after 2 hrs of induction, suggesting that inositol lipid metabolism is involved in the early differentiation events occurring at the nuclear level.

Acetamides↗
PubMed1989

Lipid phosphorylation in isolated rat liver nuclei. Synthesis of polyphosphoinositides at subnuclear level.

Isolated rat liver nuclei and subnuclear fractions synthesize polyphosphoinositides in vitro in a mode dependent on the presence of nuclear membrane, detergent and exogenous substrates. The nuclear membrane is not essential as a source of lipid kinases, since the addition of exogenous phosphatidylinositol or phosphatidylinositol monophosphate to reaction mixtures lacking membranes restores the synthesis of phosphatidylinositol mono- and bisphosphate, respectively. Inositide phosphorylation is best accomplished by high-salt extracted nuclei and pre-detergent lamina. These data suggest that the nucleus, and especially the nuclear periphery, is a cell compartment in which polyphosphoinositide synthesis occurs; this might be related to the progression of phosphatidylinositol metabolism-dependent signals to the genetic apparatus.

Adenosine Triphosphate↗
PubMed1987

RFLP analysis in families with sporadic hemophilia A. Estimate of the mutation ratio in male and female gametes.

To investigate the sporadic occurrence of hemophilia A and to estimate the sex ratio of mutation rates directly, 17 families with isolated cases of the disorder were studied by RFLP analysis and by clotting assays. Three RFLPs, one intragenic and two with close linkage to hemophilia A, were used. In eight families the RFLP study excluded the carrier status of the maternal grandmothers. Since hemostatic studies showed that the eight mothers of these propositi were hemophilia carriers, the origin of the newly mutated genes was inferred from the RFLP patterns: six hemophilic genes derived from the normal maternal grandfathers and two, from maternal grandmothers. The data indicate a higher mutation rate in males than in females, as previously suggested by segregation analysis and coagulation studies. However the sex ratio indicated by the RFLP analysis is lower than previously reported and could explain previous conflicting estimates.

Female↗
PubMedDate not supplied

Ornithine decarboxylase, polyamines and CD11b expression in HL-60 cells during differentiation induced by retinoic acid.

Polyamines (PA) and retinoic acid affect mammalian cell growth, differentiation and apoptosis. Retinoic acid induces granulocytic differentiation of mieloid cell lines and, during this process, is responsible for the expression of CD11b, a surface antigen. In this study we investigate the effects of retinoic acid on HL-60 cells, monitoring ornithine decarboxylase (ODC) activity (enzyme rate of PA), putrescine (PUT), spermidine (SPD), spermine (SPM) levels, CD11b myeloid surface marker differentiation, cell cycle, and apoptosis. ODC activity and PUT levels are correlated with mieloid cell differentiation induced by retinoic acid treatment. Only the ODC/PUT ratio is connected with retinoic acid treated HL-60 cells. Treated cultures show a decrease of proliferation and a cell block in the G0/G1 phase, with consequent diminished S phase. The G0/G1 and S phases are significantly related to ODC activity and to PUT and SPD behavior, whereas in differentiating condition only the decrease of PUT is related to the S phase. CD11b expression, stimulated by retinoic acid treatment, is associated with the SPM trend. Total PA behavior agrees with apoptotic cell increase after 96 h of stimulation. Our data show that retinoic acid treatment modifies ODC activity and the turnover of PA. PUT, SPD and SPM, therefore, have a different role, and may be involved in the differentiative/apoptotic program of retinoic acid treated HL-60 cells.

Apoptosis↗
PubMedDate not supplied

Nuclear protein kinase C-delta: a possible check-point of cell cycle progression.

Protein kinase Cs (PKCs) belong to a serine/threonine kinase family, ubiquitously expressed and claimed to be involved in physiological processes including apoptosis, cell growth and differentiation. The question of the subcellular localization and activity of PKCs remains to be clarified. Here we report that nuclear PKC-delta cooperates to regulate the S-G2/M phase transition of cell cycle, apparently being associated to chromosome condensation and alignment on the metaphase plate.

Cell Cycle↗
PubMedDate not supplied

Fhit protein expression in human gastric cancer and related precancerous lesions.

The FHIT gene is altered in several types of tumors and abnormal expression of Fhit protein have also been reported in some preneoplastic lesions. We have determined the Fhit expression on histological samples of 26 patients affected by preneoplastic lesions who developed a gastric cancer within 2 years. The expression of the Fhit protein was always present in all preneoplastic lesions, while the Fhit protein immunostaining was distributed unevenly in 10 cases and completely lost in 6. The complete loss of Fhit expression only in areas of neoplastic low differentiation suggests that FHIT gene takes part in late gastric carcinogenesis.

Acid Anhydride Hydrolases↗
PubMedDate not supplied

Inositide-modifying enzymes: a cooperative role in regulating nuclear morphology during differentiation of myeloid cells.

Differentiation and functional response of mature myeloid cells require cytoskeleton remodelling in a dynamic system that involves subcellular organization and regional signalling. Within the myeloid lineage, neutrophils constitute a cell type in which different cell compartments, and predominantly the nucleus, undergo distinctive large changes involving actin reorganization. In the context of the progressive elucidation of the nuclear structure and composition that has been achieved in the last two decades, it is now clear that the nucleus possesses an ordered and dynamic skeletal structure which shares many properties with the cytoskeleton, and the full set of substrates and enzymes that participate in the inositol lipid metabolism. Consolidated evidence indicate that the changes in cytoskeleton assembly are regulated also by phosphoinositides in a way dependent on their local concentration and availability. Indeed, enzymes able to affect the amount and phosphorylation of inositol lipids can play fundamental roles in determining the architectural transitions of the cell. The expression pattern and the changes of activity of PLC and PI 3-K in the nucleus during differentiation of tumoral myeloid precursors suggest that these enzymes play a crucial role in modifying the intranuclear pool of phosphoinositides, which in turn induce the changes in nucleoskeleton associated to granulocytic maturation. It can be speculated that defective control of nucleoskeleton assembly is one of the causes of dysregulated cell maturation or differentiative block in the course of myeloid leukemias. Inositide modifying enzymes can thus be regarded as potential targets for molecularly designed therapeutic intervention on hematological malignancies.

Actins↗