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N M Papadopoulos

Publications and source records attributed to N M Papadopoulos.

At least 55 records · Page 3Linked to original sources
PubMed1982

Incidence of gamma-globulin banding in a healthy population by high-resolution electrophoresis.

We report the incidence of electrophoretically homogeneous protein bands occurring in the gamma-globulin region in serum samples from 600 healthy adults, as determined with a high-resolution electrophoretic system. One or more electrophoretically homogeneous protein bands of various intensities were detected in the gamma-globulin region of 30 specimens when we used an improved agarose electrophoretic system, and in two specimens when we used a cellulose acetate electrophoretic system. Improvement of the agarose gel electrophoretic system thus enhanced its sensitivity in defining homogeneous protein bands in the gamma-globulin region. The incidence of these bands in a healthy population is approximately 5%.

Adult↗
PubMed1982

Lactate dehydrogenase isoenzymes in normal and malignant human lymphoid cells.

Intracellular lactate dehydrogenase (LD) isoenzyme patterns were studied in the malignant cells of patients with a variety of lymphoid malignancies. These were compared with intracellular LD isoenzyme patterns of normal lymphoid cells and were also correlated with immunologic cell surface marker characteristics. Results showed that, in general, the malignant B cells of Burkitt's lymphoma and the lymphoblasts of T-cell acute lymphoblastic leukemia had isoenzyme patterns similar to those of normal B and T cells, respectively. The isoenzyme patterns of malignant lymphoid cells from patients with non-T, and non-B acute lymphoblastic leukemia, cutaneous T-cell lymphoma, and chronic lymphocytic leukemia were more heterogeneous. These data, although based on small numbers of patients, are consistent with the hypothesis that LD isoenzymes may reflect differences in the maturational status of cells within a single diagnostic category.

B-Lymphocytes↗
PubMed1982

Five creatine kinase isoenzymes in serum of a patient with severe heart disease.

Abnormal creatine kinase (CK) isoenzyme patterns were observed in the serum of a 64-year-old woman with severe heart disease. Agarose electrophoresis revealed the presence of all the usual CK isoenzymes (MM, MB, and BB) plus an extra band between MM and MB. Total serum CK activity was within the normal range. Within 2 h after the patient suffered cardiorespiratory arrest, a fifth CK isoenzyme appeared, cathodal to MM. After cardiac valve replacement, the patient's serum showed a high activity of CK, but the isoenzyme pattern showed only MM and, transiently, an MB band. With return of the serum CK activity to normal, the CK isoenzymes pattern also became normal, virtually ruling out genetic variant(s). The abnormal CK isoenzyme patterns might have been the consequence of severe hypoxemia in the patient, thus such patients may represent an ominous prognostic sign. The association of the abnormal pattern upon admission with rapid deterioration of the condition of the patient suggests prompt attention for the prevention of complications.

Alanine Transaminase↗
PubMed1982

High-resolution zone electrophoresis, combined with immunofixation, in the detection of an occult myeloma paraprotein.

A high-resolution agarose gel electrophoretic technique, coupled with immunofixation, was used to follow paraprotein concentrations retrospectively in a patient with multiple myeloma of nine years' duration. Although the patient's IgA lambda gammopathy "disappeared" shortly after the initiation of therapy, as judged by routine cellulose acetate electrophoresis and immunoelectrophoresis, high-resolution zone electrophoresis demonstrated a monoclonal band that we identified by immunofixation as the IgA lambda paraprotein. The combination of the two simple, inexpensive, and reliable techniques of high-resolution agarose electrophoresis and immunofixation thereby permitted detection and identification of a myeloma protein in a patient otherwise thought to be in complete remission. We believe this approach is useful in assessing persistent or recurrent disease in patients with a known history of myeloma; this combination of techniques may also prove beneficial in the early diagnosis of multiple myeloma.

Adult↗
PubMed1981

Isoenzymes of lactate dehydrogenase in human leukemic cells in culture treated with inducers of differentiation.

The human leukemic cell lines HL60 and K562, were induced to differentiate terminally by chemical agents. The isoenzyme patterns of lactate dehydrogenase (LD) in the cells before and after differentiation were determined electrophoretically on agarose gels. In general, treatment of the leukemic cells with inducers of differentiation resulted in a quantitative shift of the isoenzyme pattern towards anodic or cathodic forms. This was correlated with the conversion of the chemically treated cells to morphologically more normal cells, as verified by light microscopy and/or synthesis of hemoglobin. The LD isoenzyme patterns of the chemically differentiated cells were: (a) characteristic for the particular cell type obtained rather than for the nature of the inducer used; and (b) not similar to those of normally differentiated cells of the corresponding lineage, indicating that incomplete differentiation had occurred.

Acetamides↗
PubMed1981

Method variation in lactate dehydrogenase isoenzyme determination.

Differences between methods for determining lactate dehydrogenase isoenzymes are illustrated, which can account for discrepant results. They should be taken into consideration in the interpretation of test results for the diagnosis of myocardial infarction.

Colorimetry↗
PubMed1980

Lysozyme determination in parotid saliva from patients with Sjögren's syndrome.

Lysozyme and total protein concentrations in parotid saliva were measured in 17 patients with primary Sjögren's syndrome, in six patients with Sjögren's syndrome secondary to hyperlipoproteinemia and in 14 age- and sex-matched healthy control subjects. Increased lysozyme concentrations were found only in patients with primary Sjögren's syndrome and correlated well with the presence of parotid gland enlargement. The total protein concentration in the saliva of patients with Sjögren's syndrome was not different from that of the control subjects. Parotid saliva lysozyme determination may be useful as an early adjunctive diagnostic test of primary Sjögren's syndrome.

Humans↗
PubMed1979

Myocardial infarction?--a conflict between electrocardiographic changes and biochemical data.

We present a case of hypovolemic shock accompanied by electrocardiographic changes classically associated with acute myocardial infarction. Prompt therapeutic intervention, which included correction of the hypovolemic shock, resulted in stabilization of the patient's clinical course, increased activities of the cardiac-specific enzymes in serum were not documented. Serial electrophoretic determinations of the isoenzymes of serum lactate dehydrogenase did not show the characteristic changes associated with myocardial infarction. Accurate determination of the serum isoenzymes provided valuable diagnostic information which, accompanied by the patient's clinical improvement, militated strongly against the occurrence of myocardial infarction.

Aged↗
PubMed1979

Abrnomal lipoprotein patterns in human serum as determined by agarose gel electrophoresis.

Two groups of abnormal electrophoretic patterns of serum lipoproteins are reported here. One demonstrates a deficiency or absence of lipoprotein fractions, which is characteristic of patients with abeta-lipoproteinemia, hypo-beta-lipoproteinemia, or Tangier disease. The other shows the presence of extra lipoprotein fractions, as found in cholestasis and multiple myeloma. These patterns, together with those of hyperlipoproteinemia phenotypes previously reported (Clin. Chem. 24:227, 1978), form a reference record and a basis for the detection and evaluation of lipoprotein abnormalities in normal and dyslipoproteinemic subjects, as determined by a sensitive, accurate, rapid, and inexpensive electrophoretic technique.

Abetalipoproteinemia↗
PubMed1978

Evaluation of lactate dehydrogenase isoenzyme patterns in serum of patients undergoing cardiac surgery.

Serial determinations of serum lactate dehydrogenase (LD) isoenzymes were performed in 50 patients undergoing cardiac surgery for coronary artery bypass and heart valve replacement. A sequence of LD isoenzyme patterns was established in the patients with uncomplicated recovery. These patterns served as controls for the detection of abnormal patterns associated with clinical complications. Perioperative myocardial infarction was detected in seven patients by a characteristic reversal of the LD1:LD2 ratio. These studies established that accurate determination of LD isoenzymes improved their diagnostic specificity. These isoenzymes were determined by (1) using the same technique for tissues and for serum samples, (2) applying a volume of serum containing a standard amount of enzymatic activity, and (3) making a clear separation, which allows accurate quantitation. This test can provide useful information to the surgeon for the evaluation of operative procedures and to the clinician for the appropriate management of the patient undergoing cardiac surgery.

Adult↗
PubMed1978

Hyperlipoproteinemia phenotype determination by agarose gel electrophoresis updated.

Hyperlipoproteinemia phenotyping has been re-evaluated by an improved agarose gel electrophoretic test. Eight varieties of serum lipoprotein electrophoretic patterns are demonstrated, two from clinically normal normolipidemic subjects and six from patients with hyperlipoproteinemia that include the phenotypes 1, 2a, 2b, 3, 4, and 5. The sharp delineation of the lipoprotein patterns achieved by this technique facilitates the differentiation and identifcation of the lipoprotein phenotypes. Furthermore, the lipoprotein patterns can be visually evaluated, correlated with their corresponding serum lipid values, and associated with the clinical and hereditary features of the hyperlipoproteinemia phenotypes. This test system can also be used in clinical trials and epidemiological studies.

Cholesterol↗