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Biomedical subjects

L Guy

Publications and source records attributed to L Guy.

26 records · Page 2Linked to original sources

[Treatment using percutaneous arterial embolization of post-traumatic priapism in children].

High flow rate priapism was diagnosed in a 14-year-old adolescent 5 days after a fall onto the perineum. Highly selective embolization of the 2 internal pudendal arteries was performed with gelatin (SPONGEL). Rapid resolution of the priapism as well as return of normal erection were observed within 48 hours. Doppler ultrasound revealed a high flow rate and identified the side of the traumatized artery. Endovascular embolization allows effective treatment of traumatic arteriocavernous fistula.

Accidental Falls↗

Glucocorticoids do not regulate the expression of proteolytic genes in skeletal muscle from Cushing's syndrome patients.

Glucocorticoids signal enhanced proteolysis in various instances of muscle atrophy and increased gene expression of components of the lysosomal, Ca(2+)-dependent, and/or ubiquitin-proteasome proteolytic pathways in both rat skeletal muscle and myotubes. Cushing's syndrome is characterized by chronic excessive glucocorticoid production, which results in muscle wasting. We report here no change in messenger RNA levels for cathepsin D (a lysosomal proteinase), m-calpain (a Ca(2+)-activated proteinase), ubiquitin, 14-kDa ubiquitin-activating enzyme E2, and 20S proteasome subunits (i.e. critical components of the ubiquitin-proteasome proteolytic process) in skeletal muscle from such patients. Thus, in striking contrast with animal studies, glucocorticoids did not regulate the expression of muscle proteolytic genes in Cushing's syndrome. In humans, messenger RNA levels, for at least ubiquitin and proteasome subunits, are elevated in acute situations of muscle wasting, such as head trauma or sepsis. Because Cushing's syndrome is a chronic catabolic condition, we suggest that the lack of regulation of proteolytic genes in such patients may represent an adaptive regulatory mechanisms, preventing sustained increased protein breakdown and avoiding rapid muscle wasting.

Adult↗

Human immunodeficiency virus infection and invasive cervical carcinoma.

BACKGROUND AND METHODS: To determine the relationship between cervical cancer and human immunodeficiency virus (HIV) infection, 84 women of known HIV status with invasive cervical carcinoma were assessed. Sixteen of 84 patients (19%) were HIV seropositive. The disease characteristics, recurrence rates, survival rates, and immune status of 16 seropositive and 68 seronegative women were compared. RESULTS: HIV-infected women with cervical cancer had significantly more advanced disease than those who were not infected with the virus. Only 1 of 16 (6%) HIV-infected women had early-stage surgical pathologic disease compared with 40% in the HIV-negative group. The response to therapy and prognosis were poorer among HIV-infected women, with higher recurrence and death rates compared with uninfected women. The mean CD4 counts, CD4:CD8 ratios, and percentage of CD4 cells were 360/mm3, 0.57, and 26.8% in HIV-infected women compared with 830/mm3, 1.71, and 41.2% in HIV-negative group. The patient's immune status had a significant impact on subsequent disease because only seropositive patients with CD4 counts greater than 500/mm3 had prolonged or disease-free follow-up. Surgery was performed safely in patients with relatively good immune function. CONCLUSIONS: HIV-infected women represent a unique subset of patients with cervical carcinoma that have more aggressive disease and a poorer prognosis. However, positive serostatus alone does not uniformly confer an unfavorable outcome because patients with initial adequate immune status may do well. HIV testing is recommended in all relatively young women with cervical cancer, and unique therapeutic strategies are advocated in women with these two potentially fatal diseases.

Adenocarcinoma↗

DM-GRASP, a novel immunoglobulin superfamily axonal surface protein that supports neurite extension.

We have identified a 95 kd cell surface protein, DM-GRASP, that is expressed on a restricted population of axons. Its expression begins early in chick embryogenesis, and within the spinal cord it is localized to axons in the dorsal funiculus, midline floorplate cells, and motoneurons. Antibodies to DM-GRASP impair neurite extension on axons, and purified DM-GRASP supports neurite extension from chick sensory neurons. We have cloned and sequenced the cDNA corresponding to this protein and find that it is a new member of the immunoglobulin superfamily of adhesion molecules. Consequently we have named this protein DM-GRASP, since it is an immunoglobulin-like restricted axonal surface protein that is expressed in the dorsal funiculus and ventral midline of the chick spinal cord.

Activated-Leukocyte Cell Adhesion Molecule↗