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1.
Klin Lab Diagn ; 64(4): 210-215, 2019.
Artigo em Russo | MEDLINE | ID: mdl-31108032

RESUMO

A study of the clinical analysis of blood and major metabolites of ferrokinetics in 107 breast cancer patients before treatment was conducted. In 31 (28.9%) patients revealed anemic syndrome (AS). A feature of the AS is pronounced microcytosis, erythrocyte hypochromia and low hemoglobin content in reticulocytes. Most often (n = 22; 71%) there was iron deficiency (IDA), which was characterized by a low concentration of iron (F), ferritin (FR), hepcidin 25 (GP25), interleukin-6 (IL-6) and high - soluble transferrin receptors (rTFR), transferrin (TRF). In 9 (29%) patients with AS, on the basis of a high concentration of FR, GP25, IL-6, the anemia of chronic disease (AHZ) with functional iron deficiency (FDI) was established. In 23 (74.2%) patients with AS, the was a deficiency of erythropoietin (EPO), the lowest rates were found in the group of patients with a common tumor process and FDI, with less in patients with IDA.


Assuntos
Anemia Ferropriva/diagnóstico , Anemia/diagnóstico , Neoplasias da Mama/complicações , Anemia/complicações , Anemia Ferropriva/complicações , Eritropoetina/sangue , Feminino , Ferritinas/sangue , Hemoglobinas/análise , Hepcidinas/sangue , Humanos , Interleucina-6/sangue , Ferro/sangue , Deficiências de Ferro , Receptores da Transferrina/sangue , Transferrina/análise
2.
Arkh Patol ; 77(3): 37-40, 2015.
Artigo em Russo | MEDLINE | ID: mdl-26226780

RESUMO

Osteochondroma is called a benign cartilage-forming tumor arising from an aberrant subperiosteal cartilage. Multiple osteochondromas syndrome (MOS) is an autosomal dominant disease, the basis for which is mutations in the EXT (EXT1 or EXT2) genes. Osteochondroma is one of the most common benign bone tumors. According to the WHO data, it is detectable in 35% of benign bone tumors and 8% of all surgically removed bone tumors. A total of 491 cases of bone tumors were analyzed in the children and adolescents diagnosed at the Department of Pathoanatomy, Russian Children's Clinical Hospital, Moscow, in 2009 to 2014. All the patients with osteochondroma were divided into 2 groups: 1) sporadic cases (n = 63) and 2) tumors included in MOS (n = 33). Both groups showed a preponderance of boys (39 boys and 24 girls in Group 1 and 21 boys and 12 girls in Group 2). Clinical, radiological, and morphological criteria for the diagnosis and differential diagnosis of osteochondromas in children and adolescents are given.


Assuntos
Exostose Múltipla Hereditária/diagnóstico , Exostose Múltipla Hereditária/patologia , Exostose Múltipla Hereditária/cirurgia , Adolescente , Criança , Pré-Escolar , Diagnóstico Diferencial , Feminino , Humanos , Lactente , Recém-Nascido , Masculino , Estudos Retrospectivos
3.
Bull Exp Biol Med ; 153(6): 869-73, 2012 Oct.
Artigo em Inglês, Russo | MEDLINE | ID: mdl-23113306

RESUMO

Association study of 6 candidate single-nucleotide polymorphisms (rs7921, rs7956547, rs3761243, rs11737764, rs6599400, rs1690916) was carried out in a group of patients with bone tumors of different histological structure (n=68) and control group of normal subjects (n=96). Significant associations of rs6599400 and rs1690916 polymorphisms with disease risk were detected (odds ratio 2.15 [1.06-4.24] and 0.39 [0.19-0.78], respectively). These polymorphisms were located in untranslated genome regions: polymorphism rs6599400 in the 5' region of fibroblast growth factor-3 receptor gene (FGFR3), rs1690916 in the 3' region of mouse MDM2 p53-binding protein homolog (MDM2). These data indicated a possible role of hereditary genetic factors in the formation of predisposition to bone sarcomas and confirmed previous findings according to which these genes should be regarded among the most probable factors involved in tumor development, including tumors of the bone and cartilage tissues.


Assuntos
Neoplasias Ósseas/genética , Condrossarcoma/genética , Osteossarcoma/genética , Proteínas Proto-Oncogênicas c-mdm2/genética , Receptor Tipo 3 de Fator de Crescimento de Fibroblastos/genética , Regiões 3' não Traduzidas , Regiões 5' não Traduzidas , Adolescente , Adulto , Alelos , Animais , Neoplasias Ósseas/patologia , Estudos de Casos e Controles , Condrossarcoma/patologia , Análise Mutacional de DNA , Feminino , Frequência do Gene , Predisposição Genética para Doença , Humanos , Masculino , Camundongos , Pessoa de Meia-Idade , Razão de Chances , Osteossarcoma/patologia , Polimorfismo de Nucleotídeo Único
4.
Bull Exp Biol Med ; 149(5): 628-31, 2010 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-21165404

RESUMO

The content of matrix metalloproteinases 7 and 9 was significantly increased, while the content of metalloproteinase 2 was reduced in ovarian cancer tissue compared to benign tumors. In blood serum from patients with ovarian cancer, the concentrations of matrix metalloproteinases 7 and 9 and their type 1 tissue inhibitor were significantly elevated, while the concentration of matrix metalloproteinase 2 was reduced compared to the corresponding parameters in healthy women. After chemotherapy, tissue and serum concentrations of metalloproteinases and their inhibitor in patients practically returned to normal. A significant positive correlation between serum levels of matrix metalloproteinases 7 and 9 and tissue inhibitor of metalloproteinases-1 in patients with ovarian cancer and the size of primary tumor (ultrasound examination) and a positive correlation between these parameters and the concentration of classical ovarian cancer marker CA-125 were demonstrated.


Assuntos
Biomarcadores Tumorais/sangue , Metaloproteinase 2 da Matriz/sangue , Metaloproteinase 7 da Matriz/sangue , Metaloproteinase 9 da Matriz/sangue , Neoplasias Ovarianas/sangue , Inibidor Tecidual de Metaloproteinase-1/sangue , Adulto , Feminino , Humanos , Pessoa de Meia-Idade , Neoplasias Ovarianas/tratamento farmacológico
5.
Bull Exp Biol Med ; 149(2): 233-5, 2010 Aug.
Artigo em Inglês, Russo | MEDLINE | ID: mdl-21113498

RESUMO

Comparative enzyme immunoassay of matrix metalloproteinases (MMP-2, -7, -9) and their tissue inhibitor-1 (TIMP-1) in the sera of 26 healthy individuals and 54 patients with primary osteal tumors before therapy revealed elevated TIMP-1 levels in the patients with classical central and periosteal osteosarcomas in comparison with the control. In patients, the level of MMP-9 significantly decreased compared to that in healthy individuals, while the levels of MMP-2 and MMP-7 remained unchanged. No differences in serum levels of MMP and TIMP-1 associated with gender, age, primary osteal tumor location and size were detected. Overall 3-year survival of patients with classical central osteosarcoma with serum level of MMP-9 below its median was higher than that of patients with MMP-9 level equal to above the median (90.9 ± 8.7 and 50.8 ± 23%, respectively).


Assuntos
Neoplasias Ósseas/sangue , Metaloproteinase 2 da Matriz/sangue , Metaloproteinase 7 da Matriz/sangue , Metaloproteinase 9 da Matriz/sangue , Inibidor Tecidual de Metaloproteinase-1/sangue , Adolescente , Adulto , Feminino , Humanos , Técnicas Imunoenzimáticas , Masculino , Pessoa de Meia-Idade , Estatísticas não Paramétricas , Análise de Sobrevida
6.
Bull Exp Biol Med ; 148(2): 230-7, 2009 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-20027336

RESUMO

The main biologically significant molecular markers of human tumors are discussed on the basis of modern published data and author's findings of many-year studies: steroid hormone receptors, growth factors and underlying signal proteins, tumor-associated proteases, and angiogenesis markers. Methodological aspects, progress in preclinical studies, international recommendations on the use of these parameters for prediction of the disease course and prescription of effective therapy are analyzed. Latest data on the potentialities and limitations of modern highly productive technologies (microchips) as an alternative to studies of individual molecular markers are presented.


Assuntos
Biomarcadores Tumorais/metabolismo , Neoplasias/metabolismo , Animais , Biomarcadores Tumorais/genética , Humanos , Peptídeos e Proteínas de Sinalização Intercelular/metabolismo , Neoplasias/patologia , Peptídeo Hidrolases/metabolismo , Receptores de Fatores de Crescimento/metabolismo , Fator A de Crescimento do Endotélio Vascular/metabolismo
7.
Bull Exp Biol Med ; 148(2): 246-9, 2009 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-20027339

RESUMO

Serum levels of endostatin, placental growth factor (PlGF), and fibroblast growth factors-1 and -2 (FGF-1 and FGF-2) were measured in 58 patients with primary osteosarcomas before therapy and in 21 healthy subjects. The incidence of serum FGF-1 in bone tumors was 2.5 times higher than in healthy individuals (p=0.004); significant levels of FGF-2, PlGF, and endostatin were detected in all examined subjects. The mean serum level of endostatin in healthy individuals was significantly lower than in the total group of patients with bone tumors (p=0.005). The level of FGF-1 in osteosarcomas was significantly higher than in chondrosarcomas (p<0.05). No appreciable differences in FGF-2 levels were detected in patients with tumors of different histological structure. The mean serum content of PlGF was virtually the same in healthy individuals and patients with bone tumors. A significant relationship between serum PlGF level and maximum tumor size (p=0.008) was detected in osteosarcoma. No relationships between the levels of FGF-1, FGF-2, PlGF, and endostatin were detected in healthy subjects and patients with primary tumors of the bones. Differences in 3-year overall survival values of patients with bone sarcomas with different initial serum levels of FGF-1 and endostatin were detected.


Assuntos
Endostatinas/sangue , Fator 1 de Crescimento de Fibroblastos/sangue , Fator 2 de Crescimento de Fibroblastos/sangue , Osteossarcoma/sangue , Proteínas da Gravidez/sangue , Adolescente , Adulto , Humanos , Pessoa de Meia-Idade , Fator de Crescimento Placentário , Adulto Jovem
8.
Bull Exp Biol Med ; 145(3): 362-6, 2008 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-19039945

RESUMO

Enzyme immunoassay studies revealed increased content of matrix metalloproteinases 2, 3 and 13 in tumors compared to the adjacent histologically unchanged mucosa in 70-90% patients with colorectal cancer, while the increase in the content of type 2 metalloproteinase tissue inhibitor did not reach the level of statistic significance. Plasma concentrations of these proteins did not correlate with the corresponding values in the tumors and did not surpass the normal levels, while their decrease after removal of the primary tumor was observed only in patients with initially high levels of this parameter.


Assuntos
Neoplasias Colorretais/sangue , Metaloproteinase 13 da Matriz/sangue , Metaloproteinase 2 da Matriz/sangue , Metaloproteinase 3 da Matriz/sangue , Inibidor Tecidual de Metaloproteinase-2/sangue , Adulto , Idoso , Neoplasias Colorretais/metabolismo , Neoplasias Colorretais/cirurgia , Feminino , Humanos , Técnicas Imunoenzimáticas , Mucosa Intestinal/metabolismo , Masculino , Pessoa de Meia-Idade
9.
Bull Exp Biol Med ; 145(6): 744-7, 2008 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-19110567

RESUMO

It was found that renal cancer tissue is characterized by increased content of VEGF not depending on the parameters of normal tissue and expression of VEGFR2 receptor. At the same time, the content of VEGFR2 in the tumor is determined by the state of the surrounding tissue and increases in low number of patients with tumors invading the renal capsule. Serum concentrations of VEGF and VEGFR2 in patients with renal cancer did not significantly differ from the corresponding values in the control group. No significant correlations between the levels of VEGF and VEGFR2 in the blood and tumor tissue were found.


Assuntos
Neoplasias Renais/metabolismo , Fator A de Crescimento do Endotélio Vascular/metabolismo , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/metabolismo , Adulto , Idoso , Feminino , Humanos , Neoplasias Renais/sangue , Neoplasias Renais/patologia , Masculino , Pessoa de Meia-Idade , Fator A de Crescimento do Endotélio Vascular/sangue , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/sangue
10.
Int J Biol Markers ; 21(1): 12-9, 2006.
Artigo em Inglês | MEDLINE | ID: mdl-16711509

RESUMO

Protein kinase B (Akt) plays a major role in the regulation of breast cancer growth, survival, hormone, drug and radiosensitivity, but the clinical value of its expression and activation in human tumors is unclear. Activated Akt1 (pAkt1) expression was quantified in a series of 46 breast cancer and adjacent mammary gland samples by a direct Path-Scan PhosphoAkt1 (Ser473) sandwich ELISA kit. VEGF, sVEGFR1 and sVEGFR2 levels were measured simultaneously by standard ELISA kits. Forty-nine percent of the tumors had an increased pAkt1 level as compared to adjacent tissue. pAkt1 levels were significantly higher in stage IIb than in stage I-IIa tumors. The frequency of pAkt1 elevation was positively associated with tumor size and malignancy grade. pAkt1 was also twice as frequently increased in PgR-negative as in PgR-positive tumors, while its mean level was significantly higher in ER-positive than in ER-negative tumors. VEGF, sVEGFR1 and sVEGFR2 were increased in 73-85% of the tumors, but no associations with most clinicobiological factors and pAkt1 level were found. In conclusion, activation of Akt1 is not associated with VEGF signaling protein expression in breast cancer but is related to tumor size, grade of malignancy, and steroid receptor status.


Assuntos
Neoplasias da Mama/metabolismo , Proteínas Proto-Oncogênicas c-akt/análise , Fator A de Crescimento do Endotélio Vascular/análise , Adulto , Idoso , Biomarcadores Tumorais/análise , Neoplasias da Mama/patologia , Ensaio de Imunoadsorção Enzimática/métodos , Feminino , Humanos , Pessoa de Meia-Idade , Fosforilação , Transdução de Sinais , Receptor 1 de Fatores de Crescimento do Endotélio Vascular/análise , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/análise
11.
Biochemistry (Mosc) ; 67(2): 240-5, 2002 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-11952421

RESUMO

Studies concerning the expression of the receptor CD95 (Fas) by tumor cells and the role of this protein in apoptosis induced by the effector host cells that bear Fas-ligand are mainly focused on the membrane-bound form of Fas. There are only a few data about the production of the soluble form of Fas by the tumor cells, its role in the interaction with the effector host cells, and the possible changes in the synthesis of this protein during tumor progression. In the present work, three in vitro transformed parental cell lines of different origin and 24 of their variants isolated after a short cycle of natural selection in vivo were studied. It was demonstrated for the first time that: 1) production of the soluble Fas by all selected in vivo variant tumor cell lines increased significantly (2-10-fold) in comparison to the initial (parental) cell lines and did not depend on the origin of the parental lines. At the same time, the expression of the membrane-bound form of Fas decreased considerably; 2) variations of the balance between membrane-bound and soluble forms of Fas in selected in vivo variant cells and the expression of the [H(2)O(2)(CA) + PGE(S)]-phenotype by these cells (this phenotype determines one of the essential mechanisms of the protection of a tumor cell in vivo) possibly represent independent secondary changes acquired during tumor progression in vivo.


Assuntos
Fibroblastos/metabolismo , Seleção Genética , Células Tumorais Cultivadas/metabolismo , Receptor fas/metabolismo , Animais , Antígenos de Superfície/análise , Membrana Celular , Transformação Celular Neoplásica/metabolismo , Cricetinae , Técnicas Imunoenzimáticas , Técnicas In Vitro , Mesocricetus , Isoformas de Proteínas/metabolismo , Solubilidade
12.
Biochemistry (Mosc) ; 66(3): 256-66, 2001 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-11333148

RESUMO

This review analyzes data on the biological role of 3alpha-hydroxysteroid dehydrogenase (3alpha-HSD) in animal and human tissues and describes its main characteristics, mechanism of action, and regulation of activity. Based on published data, a scheme for the actions of androgen, progestin, and glucocorticoids involving the participation of 3alpha-HSD is proposed. According to this scheme, in the mechanism of steroid action 3alpha-HSD not only regulates the concentration of the main effector androgen, 5alpha-dihydrotestosterone, in target cells, but also switches androgen, progestin, and glucocorticosteroid genomic activity to non-genomic activity.


Assuntos
3-Hidroxiesteroide Desidrogenases/metabolismo , 3-Hidroxiesteroide Desidrogenases/fisiologia , 3-Hidroxiesteroide Desidrogenases/química , 3-alfa-Hidroxiesteroide Desidrogenase (B-Específica) , Androgênios/metabolismo , Animais , Sítios de Ligação , Di-Hidrotestosterona/metabolismo , Glucocorticoides/metabolismo , Humanos , Concentração de Íons de Hidrogênio , Cinética , Modelos Biológicos , Modelos Químicos , Progestinas/metabolismo
13.
Clin Chim Acta ; 287(1-2): 59-67, 1999 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-10509896

RESUMO

Phospatidylinositol 3-kinase (PI 3-kinase) expression was analysed by Western blotting with monoclonal antibodies to the p85 subunit in a series of tumour and adjacent mammary gland samples collected at surgery from 33 breast cancer patients. Seventy-nine percent of the investigated pairs of the samples were characterised by an increased level of PI 3-kinase in the tumour in comparison with the adjacent mammary gland. PI 3-kinase activation was not associated with tumour steroid receptor status, histologic grade and other clinico-morphological characteristics. Furthermore, immunoblotting of epidermal growth factor receptor (EGFR) in the tumours with increased PI 3-kinase and corresponding adjacent tissues revealed no association between EGFR and PI 3-kinase activation. Thus, increased PI 3-kinase expression appears to be a widespread feature of breast cancer not associated with the main biological markers of its prognosis and hormone sensitivity.


Assuntos
Biomarcadores Tumorais/metabolismo , Neoplasias da Mama/enzimologia , Fosfatidilinositol 3-Quinases/metabolismo , Adulto , Idoso , Idoso de 80 Anos ou mais , Western Blotting , Ativação Enzimática , Feminino , Humanos , Pessoa de Meia-Idade
14.
Int J Cancer ; 66(6): 747-52, 1996 Jun 11.
Artigo em Inglês | MEDLINE | ID: mdl-8647644

RESUMO

We have previously demonstrated that hamster embryo fibroblasts (HEFs) transformed by Rous Sarcoma virus, Schmidt-Ruppin strain (RSV-SR) are highly resistant to damage by H202 (H2O2R), (in contrast to HEFs transformed spontaneously, or by bovine adenovirus and SV40), while N-ras transfection of RSV-SR transformants leads to suppression of pp6Ov-scr and of H2O2R. In this study we have examined (1) mechanisms of antioxidant activity (AOA) of HEFs transformed by these agents and (2) the possible role of the v-src gene in unusually high AOA of RSV-SR transformants and of activated ras oncogenes in its suppression. All transformants exhibit increased catalase and glutathione peroxidase (GP) activities, while SOD, glutathione and glutathione reductase (GR) were reduced. As compared with other transformants, the significantly higher catalase and the low SOD activities were characteristic of RSV-SR-transformants, while an increase in GP was observed in all types of transformants. Correspondingly, RSV-SR-transformants showed an extremely high H202-catabolizing activity (H2O2CA) and no lipid peroxidation chain reaction (LPCR). N-ras-induced suppression of pp60v-scr of RSV-SR-transformed HEFs coincided with the suppression of catalase, GP, H202 and H202CA. However, suppression of catalase and GP was also observed in N-ras- and Ha-ras-transfected, spontaneously transformed HEFs. Thus, extremely high catalase activity and suppression of LPCR are apparently the main mechanisms of the unusually high H202R of RSV-SR transformants, while its suppression by activated ras oncogenes may also take place in some transformants, free of v-src activity.


Assuntos
Antioxidantes/metabolismo , Vírus do Sarcoma Aviário/fisiologia , Catalase/metabolismo , Fibroblastos/patologia , Genes ras , Glutationa Peroxidase/metabolismo , Peróxido de Hidrogênio/farmacologia , Proteínas de Neoplasias/metabolismo , Proteínas Proto-Oncogênicas p21(ras)/fisiologia , Superóxido Dismutase/metabolismo , Animais , Bovinos , Linhagem Celular Transformada/efeitos dos fármacos , Transformação Celular Viral , Cricetinae , Fibroblastos/efeitos dos fármacos , Fibroblastos/metabolismo , Regulação Neoplásica da Expressão Gênica , Regulação Viral da Expressão Gênica , Glutationa/metabolismo , Glutationa Redutase/metabolismo , Mastadenovirus/fisiologia , Mesocricetus , Proteína Oncogênica pp60(v-src)/metabolismo , Estresse Oxidativo , Vírus 40 dos Símios/fisiologia , Transfecção
15.
Cancer ; 76(12): 2524-9, 1995 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-8625080

RESUMO

BACKGROUND: Epidermal growth factor (EGF) and EGF-regulated processes play an important role in steroid signal transduction. Comparative analysis of EGF and steroid receptor expression and the sensitivity of early stages of proliferation induction, such as activation of phospholipid turnover to EGF and steroids, may provide a useful new approach to characterizing the sensitivity of endometrial cancer to hormone therapy. METHODS: Progesterone (PR), estradiol (ER), and EGF receptor (EGFR) content was measured by radioligand competitive methods in surgically excised tumors from 26 patients with primary endometrial cancer. In short term cell cultures isolated from 11 of these tumors, the influence of a 10-minute treatment with 10(-8)M EGF either alone or combined with 10(-8)M progesterone on 32P-incorporation into phospholipids was studied. Phospholipids were fractionated by thin-layer chromatography and were located by autoradiography, and quantification of the labeled compounds was made by densitometric scanning of the autoradiograms. RESULTS: Epidermal growth factor receptor was found in 15 of 26 (58%) endometrial cancer samples. Eighty-two percent of the tumors studied contained PR, and 81% contained ER. No significant correlations were revealed between EGFR and ER/PR status or concentration. Epidermal growth factor stimulated 32P-incorporation by more than 120% of the control level in five of seven EGFR-positive and in one of four EGFR-negative endometrial cancer samples. An inverse relationship was revealed between EGFR content and the percentage of EGF-induced stimulation of phospholipid turnover in endometrial cancer cells (r = -0.6; P = 0.15) and between EGFR content in EGFR-positive samples and the extent of progesterone suppression of EGF-induced turnover (r = -0.77; P = 0.04). CONCLUSIONS: Determination of EGF sensitivity on a receptor and a functional level may provide important additional information about the hormonal sensitivity of endometrial cancer.


Assuntos
Neoplasias do Endométrio/fisiopatologia , Fator de Crescimento Epidérmico/fisiologia , Hormônios Esteroides Gonadais/fisiologia , Adulto , Idoso , Neoplasias do Endométrio/química , Receptores ErbB/análise , Feminino , Humanos , Pessoa de Meia-Idade , Receptores de Estradiol/análise , Receptores de Progesterona/análise
16.
Immunol Lett ; 33(3): 239-45, 1992 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-1427998

RESUMO

A biological assay for PGE in commercial preparations, or secreted by tumor cells in culture fluid was developed on the basis of the immunosuppressive effect of PGE on the cytotoxic activity of NK cells. The assay is simple, rapid and convenient for detecting PGE cell secretion, either spontaneous or induced by various signals. The sensitivity of the bioassay is limited by the sensitivity of NK cells to the immunosuppressive activity of PGE (i.e., about 10(-8) M).


Assuntos
Bioensaio/métodos , Células Matadoras Naturais/efeitos dos fármacos , Prostaglandinas E/análise , Animais , Cricetinae , Testes Imunológicos de Citotoxicidade , Citotoxicidade Imunológica/efeitos dos fármacos , Dinoprostona/farmacologia , Estudos de Avaliação como Assunto , Humanos , Imunossupressores/análise , Imunossupressores/farmacologia , Técnicas In Vitro , Células Matadoras Naturais/imunologia , Mesocricetus , Prostaglandinas E/metabolismo , Prostaglandinas E/farmacologia , Células Tumorais Cultivadas/metabolismo
17.
Int J Cancer ; 44(5): 904-7, 1989 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-2583870

RESUMO

The expression of two discrete cell properties related to the host natural effector mechanisms, i.e., resistance to damage by H2O2, a cytotoxic product of activated macrophages, and the ability to secrete PGE, which inhibits NK-cell cytotoxicity, has been examined in parental Syrian hamster embryo cells spontaneously transformed in vitro (STHE strain) and in 18 in vivo selected sublines. In all cell variants, resistance to H2O2 and PGE-releasing activity were either both expressed, or not expressed at all. Parental STHE cells and 5 variants selected in vivo, which were equally highly susceptible to H2O2-induced damage, did not release any detectable amount of PGE upon contact with NK cells. In contrast, 13 other STHE variants selected in vivo and characterized by their resistance to H2O2, all released PGE upon contact with NK cells. Thus, these two biochemically unrelated cell phenotypic characteristics are likely to be either simultaneously selected in vivo, or united in cluster which pre-exist or appear in rare cell variants of the parental cell population in the conditions of in vivo natural selection pressure.


Assuntos
Transformação Celular Neoplásica/patologia , Metástase Neoplásica , Animais , Células Cultivadas , Cricetinae , Peróxido de Hidrogênio/farmacologia , Mesocricetus , Prostaglandinas E/metabolismo
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