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Metabolic Control of Respiration and Glycolysis of Tumoral Cells

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Metabolic Control of Respiration and Glycolysis of Tumoral Cells Advances in Biological Chemistry, 2013, 3, 86-89 ABC http://dx.doi.org/10.4236/abc.2013.31011 Published Online February 2013 (http://www.scirp.org/journal/abc/) Metabolic control of respiration and glycolysis of tumoral cells Mario Gosalvez Laboratorio y Servicio de Bioquímica Experimental, Clinica and Hospital Universitario Puerta de Hierro (1970-2010), Madrid and Majadahonda, Comunidad de Madrid, Spain Email: [email protected] Received 4 December 2012; revised 5 January 2013; accepted 27 January 2013 ABSTRACT 2. THE “RESPIRATORY IMPAIRMENT” OF TUMORS The contribution of the author’s groups on the con- trol of energy metabolism of cancer cells has been The origin of this matter which stems principally from concisely reviewed. It is proposed that Otto War- Otto Warburg’s “exhortation” in Science magazine in burg’s “respiratory defect” of tumoral cells resides in 1956 was countered in a fundamental way by Sydney an alteration of the recurrent filamentation cycle of Weinhouse, Britton Chance and Peter Pedersen, in re- mitochondria. These give those organelles an affinity spect of tissue sections, living cells and isolated mito- lower for ADP than the affinity of the tumor cell chondria, respectively [1-4]. During the author’s stay in isoenzyme of pyruvate kinase. These two findings Philadelphia with the first two, between April 1968 and may explain the essentials of the intimate mechanism July 1970, the basics of the issue were learned while of the aerobic glycolysis of cancer cells. working on mitochondria and glycolysis. Everyone said that Warburg was partly right in certain Keywords: Energy Metabolism; Cancer; Mitochondrial aspects, but the tiny variations found in the respiration Filamentation; Glycolysis; Respiration; Metabolic and glycolysis of tumors were justified, especially on Control account of the great fragility of the tumoral mitochondria and because of the excessive tumor enzyme indifferen- tiation [5]. 1. INTRODUCTION Certainly there is a correlation between the intensity of Over almost the past 45 years the author has dedicated a the aerobic glycolysis and the decrease in respiration substantial part of his efforts in experimental biochemi- throughout the increase in the tumors’ malignancy [6]. Dr. cal investigation to this problem of science. He considers Gosalvez’s group proved, first with Dr. Weinhouse, that himself a disciple of Sydney Weinhouse and Britton this was due to the inability of the mitochondria to com- Chance, two pioneer investigators in the studies of en- pete with ADP, which had been sequestered by the pyru- ergy metabolism. This brief article covers his group’s vate kinase tumoral isoenzyme, the second enzyme of contribution to this, the last riddle of cancer’s molecular glycolysis which uses the ADP to phosphorylate it to physiology, without using graphs or tables, and with only ATP [7-9]. a few references. Experts in this field are well versed in In the visit to Philadelphia he tried to ascertain the contributions made by all authors in the field. How- whether it was possible to treat cancer by correcting the ever, it is arguable if the last 15 years of contributions “respiratory defect” of the cancerous cell. According to have as yet been fully digested. the great Warburg [1], this was the cause of aerobic gly- From the thousands of investigators who have devoted colysis in tumors, a fact that at the same time caused the their lives to aerobic glycolysis and the mitochondria of indifferentiation of the tumoral cell and other primitive tumoral cells, some third party publications, together cells. with his own main ones, have been selected. Genetic He familiarized himself with this theory in 1966 when, aspects are not explored because he does not consider as a clinical oncologist, he had already become disillu- that sufficient experience in this area of investigation sioned with treating cancer with citoxic agents. Very ma- exists. The progress made in molecular genetics has been lignant cancerous cells were much more resistant than marvelous, on account of the significant funding made normal cells to all known cellular toxics. He had experi- available over the last thirty five years due to the very mented on this as a clinician on some head and neck, worthwhile trend in cancer and genes. lung and ovary squamous cell carcinoma. OPEN ACCESS M. Gosalvez / Advances in Biological Chemistry 3 (2013) 86-89 87 Britton Chance accepted him during his postdoctoral thane, also cancerous, as Warburg had demonstrated. stay in order to revisit the Warburg hypothesis, well Back in Madrid, those Philadelphia studies were fur- aware that his guest was just a 27 year old clinician in ther pursued, but tempering even more the mitochondrial anticancer chemotherapy, assistant professor in bio- isolation, principally by raising the temperature to 6˚C, chemistry and physics for doctors, through the reading of to the point where a preparation had to be made every books. Certainly, Chance also knew, from reading his two hours because the mitochondrial deteriorated quickly. doctoral thesis, that he had only learned about tissue cul- Most certainly they were isolated, albeit in a less pure ture, neural microscopy and feline neurosurgery. It was a and concentrated form, as the velocity of the differential true miracle that he was taken under the wing of a centrifugations had also been somewhat decreased. world-renowned professor of Bioenergetics with such a Furthermore, his wife, Mariflor Blanco, intubated the dearth of experience in experimental biochemistry. rats with small doses of rotenone in sunflower oil, so as Chance put him into the small room, adjacent to his to fully understand the dosage received by the animals. office, with his microfluorimeter of reduced pyridine Using those methods they were successful, both with nucleotides. Here, and among many important visitors, carcinogens as well as Rotenone Tumors [10,11]. he was introduced by him to none other than Benno Hess, Additionally, Dr. Weinhouse received help from Dr. Albert Claude and Hans Krebs. Gosalvez’s laboratory in matters pertaining to the com- petition of pyruvate kinase with mitochondrial ADP [7-9]. 3. EVERYONE WAS RIGHT However they learned that the Km of the mitochondria for ADP was very low, 0.03 mM, while that of the pyru- Back in Madrid, in Puerta de Hierro Clinic’s Experimen- vate kinase was very high, 0.1 mM. Something was in- tal Biochemistry Laboratory, the problem that aroused deed amiss. The mitochondria had more affinity with his interest was given long and hard thought. By now, ADP than pyruvate kinase. Why was it that that enzyme how to work on mitochondria and glycolysis had been in tumors was competing favorably with the mitochon- mastered, to the highest level, and his laboratory, albeit dria? modest, was fit-for-purpose. Perhaps the tumoral mitochondria possessed a higher The conclusion, reached in November 1970, some Km for ADP than that of its cellular pyruvate kinase. forty two years ago now, was that everyone was right. Something which might be ascertained if the mitochon- The experiments of the field authors, from Green to dria could be isolated more physiologically—perhaps, Pedersen, including Weinhouse, Chance, Weber, Gullino, much more physiologically. As Sir Hans Krebs had once and countless others of equal merit, were absolutely cor- told him, this might be an impossible challenge for any- rect in so far as their preparatory work and conditions for one, ever. Without becoming totally dispirited, because experimenting. There had to be something that, by stat- Sir Hans had recounted to him that Otto Warburg, his ing all were correct, furnished that “interior vision” of mentor, was an absolute genius, it had to be attempted, Otto Warburg with science’s approval. To exclude the but intermittently. thinking of others was not correct, neither for this or any other matter, he thought on turning 30. 4. MITOCHONDRIAL FILAMENTATION Before Chance sent him off to be with Sydney, in July 1969, the problem, from the standpoint of experimental Finally, between 1994 and 1999, his on-and-off insis- carcinogenesis, had been jointly studied by them at the tence with this nigh on impossible task over 30 years, Jhonson Foundation. was crowned with success [12-14]. This was achieved The mitochondrial isolation had been mechanically with the help of some young collaborators and various softened in order to test the ultimate metabolic derivative other helpers who kindly shared some of their little in the liver of the carcinogen amino fluorine. Dr. Go- available spare time, undoubtedly fascinated by the im- salvez, however, considered that the mitochondrial isola- probable. He was grateful for his wife’s infinite patience, tion method was not very physiological for the study of in dressing and undressing the mitochondria with veils, pharmacological agents. The mechanical, thermic and cones and filaments, to see if they would ever be able to chemical trauma, a requirement to isolate mitochondria define and correct the already proven, albeit in a pre- of such purity and intensity, was huge. liminary way, mitochondrial filamentation defect of can- Those studies were continued with the carcinogen cer [15-17]. aflatoxin and they also tried, without success, to induce Everything appears as if, in the most fundamental as- cancer in rats by feeding them with rotenone food pellets, pects of this field—The Metabolic Control of Respiration as suggested by Chance. Rotenone is a Site 1 inhibitor of and Glycolysis of Tumoral Cells—the mitochondria form the mitochondrial respiratory chain, like anaesthetic ure- in their external membranes, recurrently, more intensely Copyright © 2013 SciRes. OPEN ACCESS 88 M. Gosalvez / Advances in Biological Chemistry 3 (2013) 86-89 with the animal at rest, veils, cones, and short radial fila- neighbor and translator from Spanish into English, Mr. Andrew Guy. ments, 25, 10 and 5 nanometres thick, which uncouples He is anon-scientific translator.
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