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Forner-Cordero I, Pérez-Pomares M, Forner A, Ponce-Garrido A, Muñoz-Langa J. PREVALENCE OF CLINICAL MANIFESTATIONS AND ORTHOPEDIC ALTERATIONS IN PATIENTS WITH LIPEDEMA: A PROSPECTIVE COHORT STUDY. Lymphology 2022. [DOI: 10.2458/lymph.4838] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Lipedema is a chronic disease seen frequently in women that causes abnormal fat deposition in the lower limbs and associated bruising and pain. Despite increasing knowledge concerning lipedema, there are still aspects of diagnosis that need further investigation. We performed a prospective, observational cohort study to describe prevalence of clinical characteristics present in patients with lipedema in an attempt to establish diagnostic criteria. Participants were consecutive patients with lipedema presenting at a public hospital in Spain from September 2012 to December 2019. Patients were examined for the following signs and symptoms of lipedema: symmetrical involvement; disproportion between the upper and lower part of the body; sparing of the feet; pain; bruising; Stemmer' sign; pitting test; fibrosis; venous insufficiency; upper limbs involvement; vascular spiders; skin coldness; and lymphangitis attacks. In addition, orthopedic alterations were examined in all patients. We recruited 138 patients (median age=47.6 years; mean BMI=29.9 Kg/m2). Using waist-to-height-ratio, 41.3% of the patients were slim or healthy. The most frequent type of lipedema was Type III (71%), and most were in stage 1 and 2. The features of lipedema with a prevalence >80% were symmetrical involvement, unaffected feet, pain, bruising, vascular spiders, and disproportion. Pain was nociceptive in 60.2% and neuropathic in 33.1%, and there was a reduced social or working activities in 37.9%. Orthopedic alterations including cavus-feet or valgus-knees were observed in 1/3 of the patients. X-ray of the knees was performed in 63 patients and knee osteoarthritis diagnosed in 37. We found that the most frequent manifestations of lipedema were bilateral involvement, unaffected feet, pain, easy bruising, vascular spiders, and disproportion between the upper and lower parts of the body. These should be considered as major criteria for diagnosis. In addition, our findings on the prevalence of orthopedic alterations in patients with lipedema highlights the need for a multidisciplinary and integrated approach.
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Forner-Cordero I, Perez-Pomares MV, Forner A, Ponce-Garrido AB, Munoz-Langa J. Prevalence of clinical manifestations and orthopedic alterations in patients with lipedema: A prospective cohort study. Lymphology 2021; 54:170-181. [PMID: 35073621] [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] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Lipedema is a chronic disease seen frequently in women that causes abnormal fat deposition in the lower limbs and associated bruising and pain. Despite increasing knowledge concerning lipedema, there are still aspects of diagnosis that need further investigation. We performed a prospective, observational cohort study to describe prevalence of clinical characteristics present in patients with lipedema in an attempt to establish diagnostic criteria. Participants were consecutive patients with lipedema presenting at a public hospital in Spain from September 2012 to December 2019. Patients were examined for the following signs and symptoms of lipedema: symmetrical involvement; disproportion between the upper and lower part of the body; sparing of the feet; pain; bruising; Stemmer' sign; pitting test; fibrosis; venous insufficiency; upper limbs involvement; vascular spiders; skin coldness; and lymphangitis attacks. In addition, orthopedic alterations were examined in all patients. We recruited 138 patients (median age=47.6 years; mean BMI=29.9 Kg/m2). Using waist-to-height-ratio, 41.3% of the patients were slim or healthy. The most frequent type of lipedema was Type III (71%), and most were in stage 1 and 2. The features of lipedema with a prevalence >80% were symmetrical involvement, unaffected feet, pain, bruising, vascular spiders, and disproportion. Pain was nociceptive in 60.2% and neuropathic in 33.1%, and there was a reduced social or working activities in 37.9%. Orthopedic alterations including cavusfeet or valgus-knees were observed in 1/3 of the patients. X-ray of the knees was performed in 63 patients and knee osteoarthritis diagnosed in 37. We found that the most frequent manifestations of lipedema were bilateral involvement, unaffected feet, pain, easy bruising, vascular spiders, and disproportion between the upper and lower parts of the body. These should be considered as major criteria for diagnosis. In addition, our findings on the prevalence of orthopedic alterations in patients with lipedema highlights the need for a multidisciplinary and integrated approach.
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Affiliation(s)
- I Forner-Cordero
- Lymphedema Unit, Physical Medicine and Rehabilitation Service. Hospital Universitari i Politècnic La Fe, University of Valencia, Valencia, Spain
| | - M V Perez-Pomares
- Brain Damage Unit, Physical Medicine and Rehabilitation Service, Hospital La Pedrera de Dénia, Valencia, Spain
| | - A Forner
- Physical Medicine and Rehabilitation Service, Sagunto Hospital, University of Valencia, Valencia, Spain
| | - A B Ponce-Garrido
- Physical Medicine and Rehabilitation Service, Hospital Universitario de Albacete, Valencia, Spain
| | - J Munoz-Langa
- Medical Oncology Department, Hospital Clínico Universitario de Valencia, Valencia, Spain
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Lamarca A, Santos A, Utpatel K, La Casta A, Stock S, Forner A, Adeva Alfonso J, Folseraas T, Fabris L, Macias R, Krawczyk M, Krawczyk M, Cardinale V, Braconi C, Alvaro D, Evert M, Bañales J, Valle J. Liver metastases (LM) from intrahepatic cholangiocarcinoma (iCCA): Outcomes from the European Network for the study of cholangiocarcinoma (ENS-CCA) registry and implications on current American Joint Committee on Cancer (AJCC) staging. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz247.058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Brillantino A, Andreano M, Lanza M, D'Ambrosio V, Fusco F, Antropoli M, Lucia A, Zito ES, Forner A, Ambrosino F, Monte G, Cricrì AM, Robustelli U, De Masi A, Calce R, Ciardiello G, Renzi A, Castriconi M. Advantages of Damage Control Strategy With Abdominal Negative Pressure and Instillation in Patients With Diffuse Peritonitis From Perforated Diverticular Disease. Surg Innov 2019; 26:656-661. [PMID: 31221028 DOI: 10.1177/1553350619857561] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Purpose. To evaluate the results of Damage Control Strategy (DCS) in the treatment of generalized peritonitis from perforated diverticular disease in patients with preoperative severe systemic diseases. Methods. All the patients with diffuse peritonitis (Hinchey 3 and 4) and the American Society of Anesthesiologists (ASA) score ≥3 were included and underwent DCS consisting of a 2-step procedure. The first was peritoneal lavage, perforated colon-stapled resection, and temporary abdominal closure with negative pressure wound therapy combined with instillation. The second step, 48 hours later, included the possibility of restoring intestinal continuity basing on local and general patients' conditions. Results. Thirty patients (18 [60%] women and 12 [40%] men, median age 68.5 [range = 35-84] years) were included (18 [60%] ASA III, 11 [36.7%] ASA IV, and 1 [0.03%] ASA V). Seven patients (23.3%) showed sepsis and 1 (3.33%) septic shock. At second surgery, 24 patients (80%) received a colorectal anastomosis and 6 patients (20%) underwent a Hartmann's procedure. Median hospital stay was 18 days (range = 12-62). Postoperative morbidity rate was 23.3% (7/30) and included 1 anastomotic leak treated with Hartmann's procedure. Consequently, at discharge from hospital, 23 patients (76.6%) were free of stoma. Primary fascial closure was possible in all patients. Conclusions. DCS with temporary abdominal closure by negative pressure wound therapy combined with instillation in patients with diffuse peritonitis from complicated diverticulitis could represent a feasible surgical option both in hemodynamically stable and no stable patients, showing encouraging results including a low stoma rate and an acceptable morbidity rate.
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Noack T, Lurz P, Besler C, Forner A, Bevilaqua C, Seeburger J, Rommel KP, Blazek S, Hartung P, Zimmer M, Mohr FW, Schuler G, Ender J, Linke A. Transcatheter Treatment of Tricuspid Regurgitation Using Edge-to-Edge Repair: Procedural Results, Clinical Implications and Predictors for Success. Thorac Cardiovasc Surg 2018. [DOI: 10.1055/s-0038-1627922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- T. Noack
- Heart Centre Leipzig, University Leipzig, Leipzig, Germany
| | - P. Lurz
- Heart Centre Leipzig, University Leipzig, Leipzig, Germany
| | - C. Besler
- Heart Centre Leipzig, University Leipzig, Leipzig, Germany
| | - A. Forner
- Heart Centre Leipzig, University Leipzig, Leipzig, Germany
| | - C. Bevilaqua
- Heart Centre Leipzig, University Leipzig, Leipzig, Germany
| | - J. Seeburger
- Heart Centre Leipzig, University Leipzig, Leipzig, Germany
| | - K.-P. Rommel
- Heart Centre Leipzig, University Leipzig, Leipzig, Germany
| | - S. Blazek
- Heart Centre Leipzig, University Leipzig, Leipzig, Germany
| | - P. Hartung
- Heart Centre Leipzig, University Leipzig, Leipzig, Germany
| | - M. Zimmer
- Heart Centre Leipzig, University Leipzig, Leipzig, Germany
| | - F.-W. Mohr
- Heart Centre Leipzig, University Leipzig, Leipzig, Germany
| | - G. Schuler
- Heart Centre Leipzig, University Leipzig, Leipzig, Germany
| | - J. Ender
- Heart Centre Leipzig, University Leipzig, Leipzig, Germany
| | - A. Linke
- Heart Centre Leipzig, University Leipzig, Leipzig, Germany
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Forner A, Bruix J. [Contrast-enhanced ultrasonography in the diagnosis of hepatocellular carcinoma]. Radiologia 2012; 55:173-4. [PMID: 23228630 DOI: 10.1016/j.rx.2012.10.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Accepted: 10/04/2012] [Indexed: 12/16/2022]
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Fuentemilla N, Lozares S, Forner A, Otal A, Pellejero S, Miquelez S, Mañeru F, Martín-Albina M, Soto P, Rubio A. EP-1342 MONITOR UNITS VERIFICATION CALCULATION IN INTENSITY MODULATED RADIOTHERAPY. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)71675-4] [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: 10/28/2022]
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Lozares S, Pellejero S, Iriondo U, Forner A, Otal A, Miquelez S, Maneru F, Martin-Albina M, Soto P, Rubio A. 1546 poster ATTENUATION OF CARBON FIBER TREATMENT COUCH AND MANAGEMENT IN ECLIPSE TREATMENT PLANNING SYSTEM. Radiother Oncol 2011. [DOI: 10.1016/s0167-8140(11)71668-1] [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: 10/18/2022]
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Vilana R, Forner A, García A, Ayuso C, Bru C. Diagnóstico por técnicas de imagen del carcinoma hepatocelular. Addendum de carcinoma hepatocelular: diagnóstico, estadificación y estrategia terapéutica. Radiología 2011; 53:156-8. [PMID: 21450323 DOI: 10.1016/j.rx.2010.10.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2010] [Revised: 10/07/2010] [Accepted: 10/07/2010] [Indexed: 01/08/2023]
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Vilana R, Forner A, García Á, Ayuso C, Bru C. Carcinoma hepatocelular: diagnóstico, estadificación y estrategia terapéutica. Radiología 2010; 52:385-98. [DOI: 10.1016/j.rx.2010.05.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2009] [Revised: 03/19/2010] [Accepted: 05/10/2010] [Indexed: 02/08/2023]
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Raoul JL, Sangro B, Forner A, Mazzaferro V, Piscaglia F, Bolondi L, Lencioni R. Evolving strategies for the management of intermediate-stage hepatocellular carcinoma: available evidence and expert opinion on the use of transarterial chemoembolization. Cancer Treat Rev 2010; 37:212-20. [PMID: 20724077 DOI: 10.1016/j.ctrv.2010.07.006] [Citation(s) in RCA: 411] [Impact Index Per Article: 29.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2010] [Accepted: 07/19/2010] [Indexed: 11/17/2022]
Abstract
Transarterial chemoembolization (TACE) is considered the gold standard for treating intermediate-stage hepatocellular carcinoma (HCC). However, intermediate-stage HCC includes a heterogeneous population of patients with varying tumour burdens, liver function (Child-Pugh A or B) and disease aetiology. This suggests that not all patients with intermediate-stage HCC will derive similar benefit from TACE, and that some patients may benefit from other treatment options. Results of an extensive literature review into the treatment of unresectable HCC with TACE were combined with our own clinical experience to identify factors that may predict survival after TACE. We also report contraindications to TACE and propose a treatment algorithm for the repetition of TACE. In addition, we have constructed a number of expert opinions that may be used as a guide to help physicians make treatment decisions for their patients with intermediate-stage HCC. The data included in the literature review related almost exclusively to conventional TACE, rather than to TACE with drug-eluting beads. Therefore, the findings and conclusions of the literature review are only applicable to the treatment of HCC with conventional TACE. Treating physicians may want to consider other treatment options for patients with intermediate-stage HCC who are not suitable for or do not respond to TACE. By distinguishing those patients who represent good candidates for TACE from those where little or no benefit might be expected, it may be possible to make better use of current treatment options and improve outcomes for patients.
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Affiliation(s)
- J-L Raoul
- Department of Medical Oncology, Centre E. Marquis, INSERM U991 and Rennes University, Rennes, France.
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Vilana R, Forner A, García Á, Ayuso C, Bru C. Hepatocellular Carcinoma: Diagnosis, staging, and treatment strategy. Radiología (English Edition) 2010. [DOI: 10.1016/s2173-5107(10)70029-x] [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: 11/15/2022]
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Llovet J, Cheng A, Qin S, Shan M, Nadel A, Burock K, Forner A, Zou J, Bruix J. 6519 Efficacy and safety of sorafenib in patients with advanced hepatocellular carcinoma (HCC): collective results from the phase III sorafenib HCC assessment randomized protocol (SHARP) and Asia-Pacific (AP) trials. EJC Suppl 2009. [DOI: 10.1016/s1359-6349(09)71241-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Forner A, Rodríguez de Lope C, Reig M, Rimola J, Varela M. Diagnóstico precoz del cáncer primario de hígado: imagen versus genética. Rev esp enferm dig 2008; 100:423-9. [DOI: 10.4321/s1130-01082008000700008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Abstract
Hepatocellular carcinoma is one of the major cancer killers. It affects patients with chronic liver disease who have established cirrhosis, and currently is the most frequent cause of death in these patients. The main risk factors for its development are hepatitis B and C virus infection, alcoholism and aflatoxin intake. If acquistion of risk factors is not prevented and cirrhosis is established, the sole option to improve survival is to detect the tumor at an early stage when effective therapy may be indicated. Early detection plans should be based on hepatic ultrasonography every 6 months, whereas determination of tumor markers is not efficient. Upon detection of a hepatic nodule, there is a need to establish unequivocal diagnosis, either through biopsy or through the application of non-invasive criteria based on the specific radiology appearance of the tumor: fast arterial uptake of contrast followed by venous washout. Effective treatment for liver cancer includes surgical resection, liver transplantation and percutaneous ablation. These options provide a high rate of complete responses and are assumed to improve survival that should exceed 50% at 5 years. If the tumor is diagnosed at an advanced stage, the sole option that improves survival is transarterial chemoembolization. Ongoing research should further advance the time at diagnosis and identify new and effective options targeting molecular pathways governing tumor progression.
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Affiliation(s)
- J Bruix
- BCLC Group, Liver Unit, IDIBAPS, Digestive Disease Institute, Hospital Clínic, University of Barcelona, Catalonia, Spain.
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Abstract
Hepatocellular carcinoma is a frequent neoplasm that usually develops in patients with liver cirrhosis. Because it is the main cause of death in these patients, they should be included in a surveillance program in order to identify these tumors at an early stage and be able to indicate curative treatment (liver transplantation, surgical resection or percutaneous ablation therapy) and to reduce mortality. Surveillance should include determination of alpha-fetoprotein and abdominal ultrasound every 6 months. This strategy should only be applied to patients suitable to receive curative treatment if diagnosed of hepatocellular carcinoma. Using this approach, 40-80% of tumors identified are solitary at diagnosis, although only half of these patients can benefit from curative treatment.
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Affiliation(s)
- M Sala
- Unidad de Hepatología, IMD, Hospital Clínic, Universitat de Barcelona, IDIBAPS, Barcelona, Spain
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Felipe V, Forner A, Mata A, Llach J, Bordas JM. [Primary biliary cirrhosis and eosinophilia: regression after treatment with ursodeoxycholic acid]. Gastroenterol Hepatol 2006; 29:60. [PMID: 16393633 DOI: 10.1157/13083255] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Forner A, Großer A, Baumann KH. Stoffübergang fest/flüssig bei oszillierender Relativbewegung zwischen Partikel und Flüssigkeit. CHEM-ING-TECH 2002. [DOI: 10.1002/cite.200290009] [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: 11/11/2022]
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Abstract
The influence of the mechanical characteristics of certain insole materials in the generation and transmission of heel strike impacts while walking was studied. Three insole materials were selected according to their mechanical characteristics under heel strike impacts. The selection of materials has made it possible to distinguish the effect of rigidity and loss tangent in the transmission of heel strike impacts. A lower rigidity and a high loss tangent have been shown to reduce the transmission of impacts to the tibia. A low rigidity was seen to significantly increase the transmission of impacts from tibia to forehead.
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Affiliation(s)
- A Forner
- Institute of Biomechanics of Valencia (IBV), València Parc Tecnologic, Spain
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Barriga C, Pombero I, Duran J, Forner A, Cardesa J, Rodriguez AB. Serum hemolytic and bactericidal activity in breast and formula-fed infants. Rev Esp Fisiol 1995; 51:213-8. [PMID: 8907436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Whether formula or breast feeding influences the functional activity of the complement system from birth to three months of age has been studied. The classical pathway was evaluated by assessing hemolytic activity, based on the capacity of the intact complement system to lyse sheep erythrocytes when coated with specific antibodies. The bactericidal activity of the serum against Staphylococcus aureus and Escherichia coli was used to evaluate the alternative complement pathway. Sera were obtained from neonates (40 +/- 2 weeks of gestation), and one-month or three-month old infants, fed either breast or formula. Control serum was obtained from healthy adults between 22 and 30 years of age. The hemolytic capacity of serum from breast-fed infants of one month and three months of age was significantly greater than that of the serum from infants which had been fed formula milk.
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Affiliation(s)
- C Barriga
- Departamento de Fisiologia (Animal), Facultad de Ciencias Univeridad de Extremadura, Badajoz, Spain
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Ortega E, Forner A, Galán M, de la Fuente M, Barriga C. Influence of age and stress from physical activity on the redistribution of lymphocytes. Rev Esp Fisiol 1994; 50:159-65. [PMID: 7886273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The influence of age and stress on the redistribution of lymphocytes between the intra- and extra-vascular spaces has been studied. Young (12 +/- 4 weeks) and old (68 +/- 6 weeks) mice were made to swim until exhaustion, with and without a previous period of training. Lymphocyte concentration in the blood and in the peritoneal cavity, was evaluated as well as the weight of spleen and thymus in these animals. In parallel, and as an indicator of the level of stress, quantification was made of the serum corticosterone levels and weight as well as the protein, DNA, and RNA content of the adrenal glands. Results indicate that, after being subjected to stress, the young mice present no changes in lymphocyte number in blood or peritoneal cavity. Old mice, however, after acute physical activity, present a greater lymphocyte content in the intravascular compartment, as well as a fall in the peritoneal lymphocyte concentration and spleen weight. The data could indicate that age modifies the response to stress, with an augmentation of lymphocytes in the intravascular compartment at the expense of the extravascular one.
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Affiliation(s)
- E Ortega
- Departamento de Fisiología (Fisiología Animal), Facultad de Ciencias, Universidad de Extremadura, Badajoz, Spain
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Mazo A, Forner A, Domènech C, Busquets M, Gelpí JL, Cortés A. Comparative analysis of the reduction of oxaloacetate by human hepatoma and normal liver extracts. Tumour Biol 1990; 11:120-8. [PMID: 2160721 DOI: 10.1159/000217646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 12/30/2022] Open
Abstract
An apparent activation of the malate dehydrogenase activity is observed in the double-reciprocal plot at high oxaloacetate concentrations when human hepatoma extracts are analyzed. This phenomenon does not occur in healthy liver samples. In hepatoma extracts, the ratio of lactate dehydrogenase to malate dehydrogenase activities becomes five-fold higher than that of normal liver. Experiments performed with mixtures of both purified enzymes and, conversely, by using oxamate, a specific inhibitor of lactate dehydrogenase, reveal that the deviation in Michaelis-Menten behavior observed is due to the oxaloacetate reductase activity of lactate dehydrogenase instead of the presence of a novel malate dehydrogenase isoenzyme.
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Affiliation(s)
- A Mazo
- Departament de Bioquímica i Fisiologia, Facultat de Química, Universitat de Barcelona, Spain
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