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Schönborn M, Gregorczyk-Maga I, Batko K, Maga M, Bogucka K, Gawlik K, Pawlica-Gosiewska D, Maga P. Angiogenic and Microvascular Status Alterations after Endovascular Revascularization of Lower Limb Arteries among Patients with Diabetic Foot Syndrome: A Prospective 12-Month Follow-Up Study. J Clin Med 2023; 12:5581. [PMID: 37685648 PMCID: PMC10488381 DOI: 10.3390/jcm12175581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2023] [Revised: 07/31/2023] [Accepted: 08/25/2023] [Indexed: 09/10/2023] Open
Abstract
Peripheral arterial disease (PAD)-induced ischemia is an important component of diabetic foot syndrome (DFS). The results of revascularization of the lower extremity arteries (including percutaneous transluminal angioplasty [PTA]) do not always give satisfactory long-term results, which is due to many factors. The aim of the study was to investigate the alterations in selected circulating angiogenic factors and microcirculation parameters in 41 patients with DFS following PTA and analyze their relationships with clinical outcomes during 1-year follow-up. Our study revealed a general decrease in pro-angiogenic factor levels after PTA and their subsequent stabilization during subsequent observation. The results indicated a significant association between plasma circulating FGF-2 level and poor outcomes (including the incidence of restenosis/reocclusion of treated arteries) during 12 months of observation. The perioperative changes in FGF-2 showed a significant association with LDF alterations after PTA. Follow-up 1-3 months post-intervention showed a tendency towards elevated TcpO2, VEGF-A, and VEGF-R2 levels in patients free from adverse events. These results may provide a basis for further research on the potential use of selected circulating angiogenic factors for monitoring the treatment of patients with DFS following PTA.
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Affiliation(s)
- Martyna Schönborn
- Department of Angiology, Faculty of Medicine, Jagiellonian University Medical College, 31-008 Krakow, Poland; (M.M.); (P.M.)
- Doctoral School of Medical and Health Sciences, Jagiellonian University, 31-007 Krakow, Poland
- Clinical Department of Angiology, University Hospital in Krakow, 30-688 Kraków, Poland;
| | - Iwona Gregorczyk-Maga
- Faculty of Medicine, Institute of Dentistry, Jagiellonian University Medical College, 31-008 Kraków, Poland;
| | - Krzysztof Batko
- Department of Research and Development, Medicine Economy Law Society (MELS) Foundation, 30-040 Krakow, Poland;
| | - Mikołaj Maga
- Department of Angiology, Faculty of Medicine, Jagiellonian University Medical College, 31-008 Krakow, Poland; (M.M.); (P.M.)
- Clinical Department of Angiology, University Hospital in Krakow, 30-688 Kraków, Poland;
| | - Katarzyna Bogucka
- Clinical Department of Angiology, University Hospital in Krakow, 30-688 Kraków, Poland;
| | - Katarzyna Gawlik
- Department of Clinical Biochemistry, Jagiellonian University Medical College, 31-008 Krakow, Poland; (K.G.); (D.P.-G.)
| | - Dorota Pawlica-Gosiewska
- Department of Clinical Biochemistry, Jagiellonian University Medical College, 31-008 Krakow, Poland; (K.G.); (D.P.-G.)
| | - Paweł Maga
- Department of Angiology, Faculty of Medicine, Jagiellonian University Medical College, 31-008 Krakow, Poland; (M.M.); (P.M.)
- Clinical Department of Angiology, University Hospital in Krakow, 30-688 Kraków, Poland;
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2
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Schönborn M, Gregorczyk-Maga I, Batko K, Bogucka K, Maga M, Płotek A, Pasieka P, Słowińska-Solnica K, Maga P. Circulating Angiogenic Factors and Ischemic Diabetic Foot Syndrome Advancement-A Pilot Study. Biomedicines 2023; 11:1559. [PMID: 37371653 DOI: 10.3390/biomedicines11061559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Revised: 05/21/2023] [Accepted: 05/22/2023] [Indexed: 06/29/2023] Open
Abstract
Despite clear evidence of inadequate angiogenesis in ischemic diabetic foot syndrome (DFS) pathogenesis, angiogenic factor level changes in patients with ischemic DFS remain inconsistent. This study aimed to assess circulating angiogenic factors concerning ischemic DFS advancement and describe their relationships with patients' clinical characteristics, microvascular parameters, and diabetic control. The study included 41 patients with ischemic DFS (67.3 (8.84) years; 82.9% males). Angiogenic processes were assessed by identifying circulating concentrations of five pro- and two anti-angiogenic factors. We found that penetrating ulcers were related to a significantly higher FGF-2 level (8.86 (5.29) vs. 5.23 (4.17) pg/mL, p = 0.02). Moreover, plasma FGF-2 showed a significant correlation with the SINBAD score (r = 0.32, p = 0.04), platelet count (r = 0.43, p < 0.01), white cell count (r = 0.42, p < 0.01), and age (r = -0.35, p = 0.03). We did not observe any significant linear relationship between the studied biomarkers and microcirculatory parameters, nor for glycemic control. In a univariate analysis using logistic regression, an increase in plasma FGF-2 was tied to greater odds of high-grade ulcers (OR 1.16; 95% CI 1.02-1.38, p = 0.043). This suggests that circulating FGF-2 may serve as a potential biomarker for predicting DFU advancement and progression. It is necessary to conduct further studies with follow-up observations to confirm this hypothesis.
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Affiliation(s)
- Martyna Schönborn
- Department of Angiology, Faculty of Medicine, Jagiellonian University Medical College, 30-663 Krakow, Poland
- Doctoral School of Medical and Health Sciences, Jagiellonian University, 31-007 Krakow, Poland
- Clinical Department of Angiology, University Hospital in Krakow, 30-688 Krakow, Poland
| | - Iwona Gregorczyk-Maga
- Faculty of Medicine, Institute of Dentistry, Jagiellonian University Medical College, 30-663 Krakow, Poland
| | - Krzysztof Batko
- Department of Research and Development, Medicine Economy Law Society (MELS) Foundation, 30-040 Krakow, Poland
| | - Katarzyna Bogucka
- Clinical Department of Angiology, University Hospital in Krakow, 30-688 Krakow, Poland
| | - Mikołaj Maga
- Clinical Department of Angiology, University Hospital in Krakow, 30-688 Krakow, Poland
- Department of Rehabilitation in Internal Medicine, Faculty of Health Sciences, Jagiellonian University Medical College, 31-008 Krakow, Poland
| | - Anna Płotek
- Clinical Department of Angiology, University Hospital in Krakow, 30-688 Krakow, Poland
| | - Patrycja Pasieka
- Department of Dermatology, Faculty of Medicine, Jagiellonian University Medical College, 31-008 Krakow, Poland
| | | | - Paweł Maga
- Department of Angiology, Faculty of Medicine, Jagiellonian University Medical College, 30-663 Krakow, Poland
- Clinical Department of Angiology, University Hospital in Krakow, 30-688 Krakow, Poland
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Wachsmann-Maga A, Kaszuba M, Maga M, Włodarczyk A, Krężel J, Kaczmarczyk P, Bogucka K, Maga P. Leukotrienes in the atherosclerotic cardiovascular diseases — a systematic review. Acta Angiologica 2022. [DOI: 10.5603/aa.2022.0013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
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4
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Riegel K, Vijayarangakannan P, Kechagioglou P, Bogucka K, Rajalingam K. Recent advances in targeting protein kinases and pseudokinases in cancer biology. Front Cell Dev Biol 2022; 10:942500. [PMID: 35938171 PMCID: PMC9354965 DOI: 10.3389/fcell.2022.942500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 06/27/2022] [Indexed: 11/24/2022] Open
Abstract
Kinases still remain the most favorable members of the druggable genome, and there are an increasing number of kinase inhibitors approved by the FDA to treat a variety of cancers. Here, we summarize recent developments in targeting kinases and pseudokinases with some examples. Targeting the cell cycle machinery garnered significant clinical success, however, a large section of the kinome remains understudied. We also review recent developments in the understanding of pseudokinases and discuss approaches on how to effectively target in cancer.
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Affiliation(s)
- Kristina Riegel
- Cell Biology Unit, University Medical Center Mainz, JGU-Mainz, Mainz, Germany
| | | | - Petros Kechagioglou
- Cell Biology Unit, University Medical Center Mainz, JGU-Mainz, Mainz, Germany
| | - Katarzyna Bogucka
- Cell Biology Unit, University Medical Center Mainz, JGU-Mainz, Mainz, Germany
| | - Krishnaraj Rajalingam
- Cell Biology Unit, University Medical Center Mainz, JGU-Mainz, Mainz, Germany
- *Correspondence: Krishnaraj Rajalingam,
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5
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Bogucka K, Marini F, Rosigkeit S, Schloeder J, Jonuleit H, David K, Schlackow M, Rajalingam K. ERK3/MAPK6 is required for KRAS-mediated NSCLC tumorigenesis. Cancer Gene Ther 2020; 28:359-374. [PMID: 33070159 DOI: 10.1038/s41417-020-00245-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 09/18/2020] [Accepted: 10/02/2020] [Indexed: 12/26/2022]
Abstract
KRAS is one of the most frequently mutated oncogenes, especially in lung cancers. Targeting of KRAS directly or the downstream effector signaling machinery is of prime interest in treating lung cancers. Here, we uncover that ERK3, a ubiquitously expressed atypical MAPK, is required for KRAS-mediated NSCLC tumors. ERK3 is highly expressed in lung cancers, and oncogenic KRAS led to the activation and stabilization of the ERK3 protein. In particular, phosphorylation of serine 189 in the activation motif of ERK3 is significantly increased in lung adenocarcinomas in comparison to adjacent normal controls in patients. Loss of ERK3 prevents the anchorage-independent growth of KRAS G12C-transformed human bronchial epithelial cells. We further find that loss of ERK3 reduces the oncogenic growth of KRAS G12C-driven NSCLC tumors in vivo and that the kinase activity of ERK3 is required for KRAS-driven oncogenesis in vitro. Our results demonstrate an obligatory role for ERK3 in NSCLC tumor progression and suggest that ERK3 kinase inhibitors can be pursued for treating KRAS G12C-driven tumors.
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Affiliation(s)
- Katarzyna Bogucka
- Cell Biology Unit, University Medical Center of the Johannes Gutenberg University Mainz, 55131, Mainz, Germany
| | - Federico Marini
- Institute of Medical Biostatistics, Epidemiology and Informatics, University Medical Center of the Johannes Gutenberg University Mainz, 55131, Mainz, Germany.,Center for Thrombosis and Hemostasis (CTH), University Medical Center of the Johannes Gutenberg University Mainz, 55131, Mainz, Germany
| | - Sebastian Rosigkeit
- Cell Biology Unit, University Medical Center of the Johannes Gutenberg University Mainz, 55131, Mainz, Germany
| | - Janine Schloeder
- Department of Dermatology of the University Medical Center of the Johannes Gutenberg-University Mainz, Mainz, Germany
| | - Helmut Jonuleit
- Department of Dermatology of the University Medical Center of the Johannes Gutenberg-University Mainz, Mainz, Germany
| | | | | | - Krishnaraj Rajalingam
- Cell Biology Unit, University Medical Center of the Johannes Gutenberg University Mainz, 55131, Mainz, Germany. .,University Cancer Center Mainz, University Medical Center Mainz, Mainz, Germany.
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6
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Bogucka K, Pompaiah M, Marini F, Binder H, Harms G, Kaulich M, Klein M, Michel C, Radsak MP, Rosigkeit S, Grimminger P, Schild H, Rajalingam K. ERK3/MAPK6 controls IL-8 production and chemotaxis. eLife 2020; 9:52511. [PMID: 32314963 PMCID: PMC7192585 DOI: 10.7554/elife.52511] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 04/17/2020] [Indexed: 12/11/2022] Open
Abstract
ERK3 is a ubiquitously expressed member of the atypical mitogen activated protein kinases (MAPKs) and the physiological significance of its short half-life remains unclear. By employing gastrointestinal 3D organoids, we detect that ERK3 protein levels steadily decrease during epithelial differentiation. ERK3 is not required for 3D growth of human gastric epithelium. However, ERK3 is stabilized and activated in tumorigenic cells, but deteriorates over time in primary cells in response to lipopolysaccharide (LPS). ERK3 is necessary for production of several cellular factors including interleukin-8 (IL-8), in both, normal and tumorigenic cells. Particularly, ERK3 is critical for AP-1 signaling through its interaction and regulation of c-Jun protein. The secretome of ERK3-deficient cells is defective in chemotaxis of neutrophils and monocytes both in vitro and in vivo. Further, knockdown of ERK3 reduces metastatic potential of invasive breast cancer cells. We unveil an ERK3-mediated regulation of IL-8 and epithelial secretome for chemotaxis.
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Affiliation(s)
- Katarzyna Bogucka
- Cell Biology Unit, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Malvika Pompaiah
- Cell Biology Unit, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Federico Marini
- Institute of Medical Biostatistics, Epidemiology and Informatics, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany.,Center for Thrombosis and Hemostasis (CTH), University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Harald Binder
- Institute of Medical Biostatistics, Epidemiology and Informatics, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany.,Institute of Medical Biometry and Statistics, Faculty of Medicine and Medical Center - University of Freiburg, Freiburg, Germany
| | - Gregory Harms
- Cell Biology Unit, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany.,Departments of Biology and Physics, Wilkes University, Wilkes Barre, United States
| | - Manuel Kaulich
- Gene Editing Group, Institute of Biochemistry II, Goethe University, Frankfurt, Germany.,Frankfurt Cancer Institute, Frankfurt, Germany
| | - Matthias Klein
- Institute of Immunology, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Christian Michel
- Department of Hematology, Medical Oncology, & Pneumology, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Markus P Radsak
- Department of Hematology, Medical Oncology, & Pneumology, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Sebastian Rosigkeit
- Cell Biology Unit, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Peter Grimminger
- Department of General, Visceral- and Transplant Surgery, University Medical Center, Mainz, Germany
| | - Hansjörg Schild
- Institute of Immunology, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Krishnaraj Rajalingam
- Cell Biology Unit, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany.,University Cancer Center Mainz, University Medical Center Mainz, Mainz, Germany
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7
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Bogucka K, Wojtczak L. [The Crabtree effect as a metabolic strategy of fast growing tumors and other rapidly proliferating cells]. Postepy Biochem 1999; 45:100-8. [PMID: 10581633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Affiliation(s)
- K Bogucka
- Instytut Biologii Doświadczalnej im. M. Nenckiego PAN, Warszawa
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8
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Wojtczak L, Teplova VV, Bogucka K, Czyz A, Makowska A, Wieckowski MR, Duszyński J, Evtodienko YV. Effect of glucose and deoxyglucose on the redistribution of calcium in ehrlich ascites tumour and Zajdela hepatoma cells and its consequences for mitochondrial energetics. Further arguments for the role of Ca(2+) in the mechanism of the crabtree effect. Eur J Biochem 1999; 263:495-501. [PMID: 10406959 DOI: 10.1046/j.1432-1327.1999.00522.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The distribution of Ca(2+) in intact cells was monitored with fluorescent probes: fura-2 for cytosolic [Ca(2+)] and rhod-2 for mitochondrial [Ca(2+)]. It was found that in neoplastic cells, such as Ehrlich ascites tumour and Zajdela hepatoma, but not in non-malignant cells, such as fibroblasts, glucose and deoxyglucose elicited release of Ca(2+) from endoplasmic reticulum stores and an increase in Ca(2+) concentration in the cytosol. Parallel to this, a decrease in the rate of Ca(2+) extrusion from the cell and an enhanced uptake of Ca(2+) by mitochondria were observed. The increase in mitochondrial [Ca(2+)] was accompanied by an increase in the mitochondrial membrane potential and the reduction state of nicotinamide nucleotides. F(1)F(o)-ATPase in submitochondrial particles of Zajdela hepatoma was strongly inhibited in the presence of micromolar Ca(2+) concentrations, whereas this activity in submitochondrial particles from rat liver appeared to be less sensitive to Ca(2+). Indications of glycosylation of Ehrlich ascites tumour cell proteins were also obtained. These data strengthen the proposal [Bogucka, K., Teplova, V.V., Wojtczak, L. and Evtodienko, Y. V. (1995) Biochim. Biophys. Acta 1228, 261-266] that the Crabtree effect is produced by mobilization of cell calcium, which is subsequently taken up by mitochondria and inhibits F(1)F(o)-ATP synthase.
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Affiliation(s)
- L Wojtczak
- Nencki Institute of Experimental Biology, Warsaw, Poland Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Russian Federation.
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9
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Bogucka K, Teplova VV, Wojtczak L, Evtodienko YV, Wojtczaka L [corrected to Wojtczak L]. Inhibition by Ca2+ of the hydrolysis and the synthesis of ATP in Ehrlich ascites tumour mitochondria: relation to the Crabtree effect. Biochim Biophys Acta 1995; 1228:261-6. [PMID: 7893730 DOI: 10.1016/0005-2728(94)00188-b] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Phosphorylation of ADP and hydrolysis of ATP by isolated mitochondria from Ehrlich ascites tumour cells is greatly reduced when the mitochondria have been preloaded with Ca2+ (50 nmol/mg protein or more). Translocation of ADP is diminished in Ca(2+)-loaded mitochondria. However, ATPase in toluene-permeabilized mitochondria and in inside-out submitochondrial particles is also strongly inhibited by micromolar concentrations of Ca2+, indicating that, independently of adenine nucleotide transport, F1Fo-ATPase is also affected. ATP hydrolysis by submitochondrial particles depleted of the inhibitory subunit of F1Fo-ATPase (the Pullman-Monroy protein inhibitor) is insensitive to Ca2+; however, this sensitivity is restored when the particles are supplemented with the inhibitory subunit isolated from beef heart mitochondria. In view of the previous observations that glucose elicits in Ehrlich ascites tumour cells an increase of cytoplasmic free Ca2+ (Teplova, V.V., Bogucka, K., Czyz, A., Evtodienko, Yu.V., Duszyński, J. and Wojtczak, L. (1993) Biochem. Biophys. Res. Commun. 196, 1148-1154) and that this calcium is then taken up by mitochondria, resulting in a strong inhibition of coupled respiration (Evtodienko, Yu.V., Teplova, V.V., Duszyński, J., Bogucka, K. and Wojtczak, L. (1994) Cell Calcium 15, 439-446), the present results are discussed in terms of the mechanism of the Crabtree effect in tumour cells.
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Affiliation(s)
- K Bogucka
- Nencki Institute of Experimental Biology, Department of Cellular Biochemistry, Warsaw, Poland
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10
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Teplova VV, Duszyński J, Bogucka K, Wojtczak L. The role of cytoplasmic [Ca2+] in glucose-induced inhibition of respiration and oxidative phosphorylation in Ehrlich ascites tumour cells: a novel mechanism of the Crabtree effect. Cell Calcium 1994; 15:439-46. [PMID: 8082127 DOI: 10.1016/0143-4160(94)90108-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The effect of Ca2+ on energy-coupling parameters of Ehrlich ascites carcinoma was studied in digitonin-permeabilized cells. In nominally Ca-free medium the permeabilized cells respond to the addition of ADP by increased oxygen uptake with externally added respiratory substrates (succinate or pyruvate), decrease of the mitochondrial membrane potential (delta psi) and alkalinization of the medium. This typical behaviour is drastically changed if Ca2+ is added. The subsequent addition of ADP induces neither State 3 respiration, nor decrease of delta psi, nor alkalinization of the medium, indicating a complete block of ATP synthesis. These effects are produced by both a single pulse of 100 microM Ca2+ and a preincubation for 2 min with 0.4-1.0 microM Ca2+. Preincubation of the cells with glucose or deoxyglucose prior to permeabilization makes them sensitive to Ca2+ concentrations as low as 0.3 microM. In view of the previous finding that glucose and deoxyglucose produce an increase of cytoplasmic [Ca2+] in Ehrlich ascites cells [Teplova VV. Bogucka K. Czyz A. Evtodienko YuV. Duszyński J. Wojtczak L. (1993) Biochem. Biophys. Res. Commun., 196, 1148-1154; Czyz A. Teplova VV. Sabala P. Czarny M. Evtodienko YuV. Wojtczak L. (1993) Acta Biochim. Polon., 40, 539-544], the present results suggest that cytoplasmic Ca2+ plays a crucial role in the Crabtree effect.
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Teplova VV, Bogucka K, Czyz A, Evtodienko YV, Duszyński J, Wojtczak L. Effect of glucose and deoxyglucose on cytoplasmic [Ca2+] in Ehrlich ascites tumor cells. Biochem Biophys Res Commun 1993; 196:1148-54. [PMID: 8250873 DOI: 10.1006/bbrc.1993.2371] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Concentration of free cytoplasmic Ca2+ ([Ca2+]i) in Ehrlich ascites tumor cells, measured using fura-2, amounted to 170-300 nM and was increased by 50-160 nM after addition of 10 mM D-glucose or D-2-deoxyglucose but not 3-O-methylglucose at pH 7.4. In the range of external pH between 6.8 and 7.8 the increase was higher at higher pH. This increase occurred within 30-60 s after addition of hexose and lasted for at least 10 min. This [Ca2+]i rise was observed both in presence and virtual absence of Ca2+ in the external medium. Pretreatment of the cells with thapsigargin resulted in a much smaller [Ca2+]i increase after addition of glucose or deoxyglucose. The mechanism of [Ca2+] in the external medium. Pretreatment of the cells with thapsigargin resulted in a much smaller [Ca2+]i increase after addition of glucose or deoxyglucose. The mechanism of [Ca2+]i rise evoked by glucose and deoxyglucose and its importance in switching cell metabolism from oxidative to glycolytic are discussed.
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Affiliation(s)
- V V Teplova
- Nencki Institute of Experimental Biology, Warsaw, Poland
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12
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Wojtczak L, Bogucka K, Duszyński J, Zabłocka B, Zółkiewska A. Regulation of mitochondrial resting state respiration: slip, leak, heterogeneity? Biochim Biophys Acta 1990; 1018:177-81. [PMID: 2393656 DOI: 10.1016/0005-2728(90)90243-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The contribution of molecular slippage of proton pumps, of proton leak and of coupling heterogeneity of mitochondrial population to the well-known non-linear interrelationship between resting state respiration and the protonmotive force is discussed in view of the following experimental findings. (1) After blocking mitochondrial respiration with cyanide, the rate of dissipation of the membrane potential is non-linearly dependent on the actual membrane potential, similarly to the resting state respiration in mitochondria titrated with small amounts of an inhibitor. In contrast, delta pH dissipates proportionally to its actual value. (2) The rate of electron flow from succinate to ferricyanide depends upon the protonmotive force, similarly to the flow from succinate to oxygen. This strongly suggests that the H+/e- stoichiometry in complexes III and IV of the respiratory chain is constant. (3) Mitochondria 'in situ', in permeabilized Ehrlich ascites cells, exhibit the same non-linear flux/force relationship as isolated mitochondria. These results strongly suggest that the non-ohmic characteristics of the inner mitochondrial membrane, with respect to protons driven by the membrane potential but not by the concentration gradient, is the main factor responsible for the nonlinear flux/force relationship in resting state mitochondria.
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Affiliation(s)
- L Wojtczak
- Department of Cellular Biochemistry, Nencki Institute of Experimental Biology, Warsaw, Poland
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13
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Bogucka K, Wroniszewska A, Bednarek M, Duszyński J, Wojtczak L. Energetics of Ehrlich ascites mitochondria: membrane potential of isolated mitochondria and mitochondria within digitonin-permeabilized cells. Biochim Biophys Acta 1990; 1015:503-9. [PMID: 2302389 DOI: 10.1016/0005-2728(90)90084-h] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Ehrlich ascites tumour cells were treated with digitonin so that they became permeable for low-molecular-weight compounds but, at certain concentrations of digitonin, retained most of their cytoplasmic proteins. Respiration of mitochondria with exogenous substrates and their membrane potential could thus be measured in situ by means of oxygen electrode and tetraphenylphosphonium-sensitive electrode, respectively. The results were compared with data from similar measurements on mitochondria isolated from such digitonin-permeabilized cells. Isolated mitochondria and mitochondria in situ oxidized succinate at similar rates and developed membrane potential of comparable magnitude. Both preparations also exhibited an identical nonlinear relationship between resting state respiration (titrated with a respiratory inhibitor) and the membrane potential. In the cells permeabilized with low concentrations of digitonin (i.e., retaining most of cytoplasmic proteins) and suspended in medium containing NaCl and other major anions and cations at concentrations close to those in mammalian plasma, anaerobiosis did not produce a decrease in the mitochondrial membrane potential, which was collapsed only after a subsequent addition of oligomycin. In this medium, glucose had little effect on either respiration or the membrane potential.
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Affiliation(s)
- K Bogucka
- Department of Cellular Biochemistry, Nencki Institute of Experimental Biology, Warsaw, Poland
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Abstract
The relationship between the respiration rate and the magnitude of the electrochemical proton potential (delta mu H+) in rat liver mitochondria was investigated. (1) Under the active-state conditions, the action of inhibitors of either phosphorylation (oligomycin) or respiration (rotenone, malonate) on the respiration and delta mu H+ was measured. Both inhibitors diminished the respiration, whereas rotenone resulted in a decrease of delta mu H+, and oligomycin produced an increase of this potential. The effect of the inhibitors was much more pronounced on the respiration rate than on delta mu H+; for example, the excess of oligomycin produced a 90% inhibition of the respiration while delta mu H+ was changed only by 9%. (2) Under the resting-state conditions, small concentrations of the uncoupler stimulated the respiration while changing delta mu H+ to a relatively small extent. The uncoupler concentrations which doubled and tripled the respiration rate produced only 5 and 9% decrease of delta mu H+, respectively. (3) The present results enabled us to propose a model describing the interrelationship between respiration and delta mu H+.
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Duszyński J, Bogucka K, Letko G, Küster U, Kunz W, Wojtczak L. Relationship between the energy cost of ATP transport and ATP synthesis in mitochondria. Biochim Biophys Acta 1981; 637:217-23. [PMID: 7295709 DOI: 10.1016/0005-2728(81)90160-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Liver mitochondria form rats kept on a high-protein diet exhibit an increased rate of respiration upon addition of ornithine in the presence of HCO2 and NH+4. This is the manifestation of intramitochondrial utilization of ATP for the synthesis of citrulline. State 3 respiration of these mitochondria could be adjusted to the same rate as that produced by ornithine by either using limiting amounts of hexokinase or titration with atractyloside. Under such conditions, in both systems the proton-motive force, the intramitochondrial ATP/ADP ratio and the redox state of the respiratory chain were the same. In contrast to this, the ATP/O ratio (equal to 2 X citrulline/O ratio) in mitochondria synthesizing citrulline was higher than the glucose 6-phosphate/O ratio in the system where ATP was trapped extramitochondrially. The ratio of these two ratios was close to 1.5 with both glutamate and succinate as respiratory substrates. From these results it can be concluded that the translocation of ATP against ADP and phosphate utilizes an amount of the chemiosmotic proton gradient equal to half of that needed for the synthesis of ATP in the inner compartment.
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Küster U, Letko G, Kunz W, Duszyńsky J, Bogucka K, Wojtczak L. Influence of different energy drains on the interrelationship between the rate of respiration, proton-motive force and adenine nucleotide patterns in isolated mitochondria. Biochim Biophys Acta 1981; 636:32-8. [PMID: 7284343 DOI: 10.1016/0005-2728(81)90072-4] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The respiration of rat liver mitochondria was stimulated by three different ways of energy drain: (a) partial uncoupling (equivalent to direct collapse of the proton-motive force), (b) intramitochondrial utilization of ATP for citrulline synthesis, and (c) extramitochondrial utilization of ATP for glucose phosphorylation. At identical rates of respiration, the intramitochondrial ATP : ADP ratios were the same in all three systems. Furthermore, the proton-motive force was the same in partially uncoupled mitochondria and in the presence of hexokinase plus glucose up to a respiration rate amounting to about 60% of that of the fully active state. However, external ATP : ADP ratios were considerably different in various systems at comparable rates of oxygen uptake, being the lowest under conditions when ATP was being utilized externally. On this basis, it is concluded that the respiratory rate is controlled directly by the proton-motive force and the mitochondrial ATP-synthesizing system operates under near-equilibrium conditions with respect to the membrane energy state parameters. However, a disequilibrium exists at the step of the transport of ATP from mitochondria to the external (cytoplasmic) compartment.
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