Biomedical subjects

A L Lightsey

Publications and source records attributed to A L Lightsey.

22 records · Page 2Linked to original sources

PubMed1976

Different antiplatelet antibody specificities in immune thrombocytopenic purpura.

It is generally accepted that patients with immune thrombocytopenic purpura (ITP) produce antibody against platelet-associated antigens; however, it is not known if these antiplatelet antibodies are directed towards the same or different antigenic sites. In the present studies, quantities of antiplatelet antibody from different ITP patients, sufficient to saturate platelet antigenic sites, were simultaneously incubated with normal platelets and the quantity of platelet-binding IgG (PBIgG) was determined. In each of the five comparisons made, the amount of PBIgG bound after incubation of normal platelets with saturating quantities of two ITP antibodies approximated to the sum of the PBIgG bound after incubation with the antibodies separately. These data suggest that the antiplatelet antibody from these ITP patients differed in antigenic specificity.

Antibody Specificity↗

PubMed1976

In vitro production of platelet-binding IgG in childhood idiopathic thrombocytopenic purpura.

We studied two boys, 9 and 10 years old, respectively, who underwent splenectomy eight months and six weeks after initially presenting as "typical" cases of childhood ITP. Splenic leukocytes from each child were cultured and net synthesis rates of IgG determined. Splenic synthesis rates of IgG were five-and sevenfold greater, respectively, than in spleens of control subjects. A significant portion of the splenic culture-produced IgG from each patient demonstrated specificity for homologous and autologous platelets. Synthesis rates of IgG were determined on serial cultures of bone marrow cells from the 10-year-old boy who failed to respond to splenectomy. His initial marrow synthesis rate of IgG was five times greater than mean control values. His synthesis rate of IgG in marrow decreased to the control range in association with immunosuppressive therapy and intesive platelet transfusions. These data suggest that (1) the spleen was a production site of platelet-binding IgG in the two children, and (2) the bone marrow may have been an additional site of production in our second patient.

Antibodies↗

PubMed1975

Childhood idiopathic thrombocytopenic purpura. Aggressive management of life-threatening complications.

Idiopathic thrombocytopenic purpura (ITP) in childhood is usually a benign, self-limited illness. Life-threatening complications, such as central nervous system (CNS) hemorrhage, occur in less than 1% of cases. We report a case in which the patient failed to respond to splenectomy and high-dose corticosteroid therapy. Immunosuppressive therapy with cyclophosphamide, vincristine sulfate, and corticosteroids in conjunction with frequent transfusions of platelets was associated with a complete remission that persisted after therapy was discontinued.

Age Factors↗

PubMed1975

The micromeasurement of free erythrocyte protoporphyrin as a means of differentiating alpha thalassemia trait from iron deficiency anemia.

Free erythrocyte protoporphyrin levels were measured in 29 individuals with alpha thalassemia trait, 19 with proved iron deficiency anemia, and 25 normal control subjects. Individuals with alpha thalassemia trait and normal iron studies had FEP levels in the normal range despite marked degrees of microcytosis. In contrast, individuals with iron deficiency anemia had marked elevation of FEP levels with similar degrees of microcytosis. Measurement of FEP levels appears to be a useful tool in differentiating alpha thalassemia trait from iron deficiency anemia.

Anemia, Hypochromic↗