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Biomedical subjects

H Cam

Publications and source records attributed to H Cam.

8 recordsLinked to original sources
PubMed2004

Hepatitis B vaccination in children with juvenile idiopathic arthritis.

OBJECTIVES: To evaluate the responsiveness of children with juvenile idiopathic arthritis (JIA) to hepatitis B vaccination and to determine the most useful vaccination schedule. METHODS: 39 children with JIA were enrolled in the study; all were in remission and negative to serological testing for hepatitis B surface antigen (HbsAg). The control group consisted of 41 healthy children. There were two different vaccination schedules: group I was vaccinated at 0, 1, and 3 months; group II was vaccinated at 0, 1, and 6 months. Positive responsiveness to the vaccine was defined as an anti-hepatitis B antibody titre above 10 mIU/ml. RESULTS: All the children except one with systemic JIA developed an antibody response. None of the JIA patients experienced a flare up or clinical deterioration related to the vaccination. The antibody levels in children with JIA were significantly lower than in the healthy controls. Comparison of the antibody levels between the two vaccination schedules showed no statistical difference in the controls; in the JIA subjects the group II schedule resulted in a trend to a greater response than the group I schedule (p<0.07). Vaccine responsiveness was not influenced by either methotrexate or prednisolone treatment. CONCLUSIONS: Children with JIA had an adequate response to hepatitis B vaccination and the response was not affected by immunosuppressive treatment. A vaccination schedule at 0, 1, and 6 months seems to be preferable to 0, 1, and 3 months.

Adolescent↗
PubMed2001

Active repression and E2F inhibition by pRB are biochemically distinguishable.

To understand mechanistically how pRB represses transcription, we used a reconstituted transcription assay and compared pRB activity on naked versus chromatin templates. Surprisingly, when pRB was directly recruited to a naked template, no transcriptional repression was observed. However, we observed active repression when the same promoter was assembled into chromatin. Histone deacetylases do not appear to play a role in this observed repression. Further experiments showed repression could occur after preinitiation complex assembly, in contrast with pRB inhibition of E2F, suggesting discrete mechanisms by which pRB directly inhibits an activator such as E2F or actively represses proximally bound transcription factors.

Carrier Proteins↗
PubMed1995

Reduced immune response to hepatitis B vaccine in children with insulin dependent diabetes.

Twenty-four patients with moderately controlled insulin dependent diabetes with a duration of diabetes ranging from 2 to 10 years as well as 17 control subjects were vaccinated against hepatitis B virus using Gen Hevac B vaccine. The vaccine was injected 0.5 mL intramuscularly into the deltoid region on three separate occasions at intervals of 1 month. If subjects were still negative for anti-hepatitis B surface antigen (HBs) or had inadequate antibody after the third injection, a fourth administration of vaccine was given 3 months later. The mean anti-HBs titer was 243.3 +/- 97.2 mi.u./mL in control subjects and 39.8 +/- 53.2 in diabetic patients (P < 0.001). In the control group optimal protection was obtained in 100% of subjects, whereas 11 diabetic patients (45.8%) had low anti-HBs titer (< 10 mi.u./mL). All of 11 diabetic patients showed adequate (> 10 mi.u./mL) anti-HBs titer after the fourth dose of vaccine. In diabetic patients the most striking feature was the reduced CD4/CD8 ratio which was significantly lower (P < 0.001) than that of the control group. We conclude that diabetic children have an impaired immune response to hepatitis B vaccine. It is suggested that diabetic children should be vaccinated against hepatitis B virus with four injections instead of three.

Adolescent↗