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Biomedical subjects

D Charron

Publications and source records attributed to D Charron.

At least 235 records · Page 13Linked to original sources
PubMed1979

Biochemical and histological analysis of bone marrow collagen in myelofibrosis.

Total protein, collagen (hydroxyproline) and glycoproteins (hexosamine) content of control and myelofibrosis (MF) bone marrow samples was determined using a sequential extraction procedure. MF marrow extracts contained higher amounts of collagen than control extracts. The collagen content appeared to increase with the duration of the disease. In more recent MF cases (less than 2 years) at least 60% of the total collagen was extracted in 0.5 M NaCl. this proportion decreases to 33% in older cases (greater than 4 years), indicating a progressive insolubilization (crosslinking) of collagen. The hexosamine content of the extracts decreased in MF as compared to controls reflecting a decrease in glycosaminoglycans (and possibly of structural glycoproteins). The reticulin content of the same bone marrows was estimated by a quantitative morphometric procedure. There was a positive correlation between the morphometrically estimated reticulin surface and the total hydroxyproline content of the marrow samples. The slopes of the least square lines correlating increase of reticulin surface to hydroxyproline content were, however, significantly different in control and MF marrows, indicating a 44% higher increase in histochemically detectable reticulin per unit increase in hydroxyproline content than in the control marrows. This result may indicate a more efficient fibrogenetic process in MF marrow than in normal bone marrow. The above results confirm the collagenous nature of the fibrous reticulin like material deposited in MR marrows and suggests a correlation between the progression of the disease and the rate of synthesis and deposition of collagen fibres.

Adult↗
PubMed1979

Identification of a pure splenic form of chronic lymphocytic leukaemia.

We have recently proposed a new staging system for chronic lymphocytic leukaemia (CLL) in which patients with isolated splenomegaly are classified into a distinct stage (stage II). Twenty-three such patients (from two institutions) have been studied without recorded death in a follow-up of 18 months to 30 years. This favourable prognosis justifies separation of these 'pure splenic forms' (SCLL) which must be distinguished from what Galton has termed prolymphocytic leukaemia (PL). This distinction can be made on the basis of three criteria: (i) Clinically, SCLL has a slow uneventful course and neither anaemia and/or thrombocytopenia: (ii) cytologically PL can be distinguished from other forms of CLL though atypical forms of CLL may be confused with the former; and (iii) the study of surface membrane immunoglobulins (SmIg) showed that while lymphocytes from most patients with both PL and SCLL bore uniform SmIg, suggesting a monoclonal B-cell proliferation, there was a major quantitative difference in that whereas PL lymphocytes had a number of antigenic sites close to that of normal lymphocytes (mean: 82 000 sites per cell), SCLL lymphocytes had a drastically reduced number of sites. It is our opinion that this is an important criterion for the differential diagnosis between PL and SCLL.

Aged↗
PubMed1979

[Quantitative study of medullary adipocytes in marrow aplasia (author's transl)].

Quantification of adipocyte surface in relation to hematopoietic tissue was performed quantitatively with a classimat on 21 marrow biopsies from patients belonging to the Cooperative Marrow Aplasia Group. This analysis revealed two quantitative parameters, distribution and homogeneity, which permitted the classification of the biopsies into four groups. Each of these categories has been correlated with clinical and kinetic data.

Adipose Tissue↗
PubMed1978

[Comparative study of the peripheral lymphocyte count in controls and in patients with chronic lymphocytic leukemias 4 hours after injection of hydrocortisone (author's transl)].

The peripheral lymphocyte count was investigated prior to and 4 h after a single intravenous injection of 400 mg of hydrocortisone (HSHC) in 23 controls and 43 patients with chronic lymphocytic leukemia. A reduction in the peripheral lymphocyte count was observed in all normal controls, the mean decrease being 51.9%, with differences according to age.

Aged↗
PubMed1978

[A new parameter for chronic lymphocytic leukemia : determination of the large lymphocytes by means of Hemalog D (author's transl)].

The munber of large peripheral lymphoid cells and the ratio of these large unstained cells (LUC) to the total number of peripheral lymphocytes were determined by means of the Hemalog D in 57 patients with chronic lymphocytic leukemia (CLL) and in 100 controls. While the absolute number of LUC per mm3 is simply a reflection of peripheral lymphocytosis, the ratio LUC/total lymphocyte count was shown to correlate with clinical staging. In controls, this ratio ranged from 3.2% to 11.2%. In CLL is was less than 11.2% in 43 patients and less than 11.2% in 14 patients. This latter group corresponded statistically to patients with advanced disease in our clinical staging system (stages III and IV). An increase in the LUC/total lymphocyte ratio is therefore a statistical criterion of poor prognosis.

Autoanalysis↗
PubMed1977

Investigation of a new parameter in chronic lymphocytic leukemia: the percentage of large peripheral lymphocytes determined by the Hemalog D. Prognostic significance.

The number of large peripheral lymphoid cells and the ratio of these large unstained cells to the total number of peripheral lymphocytes was determined by means of the Hemalog D in 57 patients with chronic lymphocytic leukemia (CLL) and in 100 control subjects. Although the absolute number of large unstained cells/mm3 is simply a reflection of peripheral lymphocytosis, the ratio large unstained cells to total lymphocyte count was shown to correlate with clinical staging. In control subjects, this ratio ranged from 3.2 per cent to 11¿per cent. In those with CLL it was less than 11.2 per cent in 43 patients and greater than 11.2 per cent in 14 patients. These 14 patients corresponded statistically to patients with advanced disease in our clinical staging system (stages III and IV). An increase in the large unstained cells to total lymphocyte ratio is therefore a statistical criterion of poor prognosis.

Humans↗
PubMed1977

Variations in lymphocyte counts four hours after administration of hydrocortisone in patients with chronic lymphocytic leukemia.

The peripheral lymphocyte count and the number of large unstained cells (LUC) were investigated prior to and 4 hr after a single intravenous injection of 400 mg of hydrocortisone in 23 controls and 51 patients with lymphoid disorders (43 chronic lymphocytic leukemia, 3 cases of Waldenström macroglobulinemia, 2 hairy cell leukemias, 1 Sézary syndrome, and 2 cases of infectious mononucleosis). A reduction in both the peripheral lymphocyte counts and the number of LUC was observed in all normal controls, the mean decrease being 54% and greater than 60%, respectively, with differences according to age. In chronic lymphocytic leukemia (CLL), the peripheral lymphocyte count showed a variable response: decrease, no change, or increase. A correlation was shown to exist between a decrease in peripheral lymphocyte counts and anatomical-clinical staging: patients with involvement restricted to blood and bone marrow very often exhibited a drop in their peripheral lymphocyte count (p less than 0.01). In addition, the percentage of circulating T lymphocytes was higher (54%) in CLL patients whose peripheral lymphocyte count dropped than in other CLL patients (p less than 0.001).

Age Factors↗
PubMed1976

Unclassified haemolytic anaemia with splenomegaly and erythrocyte cation abnormalities--a disease of the spleen?

An unclassified case of haemolytic anaemia with voluminous splenomegaly is reported. This anaemia was normocytic without any specific morphologic aspect of red blood cells (RBC); Coombs test was negative; the osmotic fragility was normal; the increased autohaemolysis was not affected by the presence of glucose; Hb studies were normal; no RBC enzyme deficiency was found; RBC lipids and membrane proteins were normal; there was a marked reduction in RBC survival with exclusive splenic uptake of erythrocytes. Before splenectomy, RBC cations and water content were abnormal: 1) the RBC water was decreased moderately; 2) the RBC sodium was about twice the normal mean with an increased 22Na turn-over; 3) the RBC potassium was markedly reduced and 42K influx was twice the normal mean; 4) the RBC calcium content was increased. Splenectomy was followed by rapid disappearance of haemolysis and RBC water and cation disturbances. Because of this extremely rapid disappearance after splenectomy the authors suggest this case of haemolytic anaemia could be a primary disease of the spleen.

Adult↗
PubMedDate not supplied

Spread of clonal T-cell expansions in rheumatoid arthritis patients.

Despite a large number of studies identifying expanded T-cell clones among infiltrating lymphocytes, little is known about their distribution in patients suffering from rheumatoid arthritis. To evaluate the clonality of alpha/beta T-cell populations in arthritic locations and PBL, we determined the CDR3 size lengths of TCR beta-chain transcripts using BV (Vbeta), BC (Cbeta), BJ (Jbeta), and clonotype-specific primers. Transcripts from PBL of healthy donors show gaussian profiles of approximately eight CDR3 size peaks in most BV subfamilies. Dominant peaks standing out above the normal background identify expansions of one or several T-cell clones within a given BV subfamily. The analysis of six patients suffering from rheumatoid arthritis showed clonal expansions in all samples including PBL. Synovial tissue infiltrates revealed less complex repertoires with a greater number of expanded clones than PBL. Expanded clones varied from one patient to another; no recurrences were observed. Most interestingly, identical clones were identified bilaterally in arthritic knee joints and PBL from the same patient. Our data show that given T-cell clones are not only locally expanded but can also be found in the periphery, and strongly suggest that many similar clones spread throughout the bodies of patients.

Adult↗