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Effects of growth hormone on the factor VIII complex in patients with growth hormone deficiency
Insights
Growth hormone administration significantly increased factor VIII complex levels in children with growth hormone deficiency. While not essential for maintaining normal basal levels, growth hormone influences factor VIII activity, coagulant antigen, and related antigen levels.
Area of Science:
- Pediatric Endocrinology
- Hematology
- Growth Hormone Research
Background:
- Factor VIII complex is crucial for hemostasis.
- Growth hormone deficiency can impact various physiological processes.
- The relationship between growth hormone and coagulation factors is not fully understood.
Purpose of the Study:
- To investigate the effect of human growth hormone administration on factor VIII activity (VIII C), factor VIII coagulant antigen (VIII C:Ag), factor VIII-related antigen (VIII R:Ag), and Ristocetin cofactor (R:Cof) in children with growth hormone deficiency.
Main Methods:
- Studied eight children with growth hormone deficiency.
- Measured basal levels of factor VIII complex components.
- Assessed levels at 60, 120, and 180 minutes post-administration of human growth hormone (4 U/m2).
Main Results:
- Basal levels of factor VIII complex components were within normal limits.
- Significant increases in VIII C, VIII C:Ag, VIII R:Ag, and R:Cof were observed after human growth hormone administration.
- Growth hormone is not required for maintaining normal basal factor VIII complex levels.
Conclusions:
- Growth hormone administration influences factor VIII complex levels in children with growth hormone deficiency.
- The precise mechanisms underlying the rise in factor VIII complex levels post-growth hormone administration require further investigation.
Abstract:
Factor VIII activity (VIII C), factor VIII coagulant antigen (VIII C:Ag), factor VIII-related antigen (VIII R:Ag), Ristocetin cofactor (R:Cof), and growth hormone were studied in eight children with growth hormone deficiency prior to, and 60, 120, and 180 minutes after administration of human growth hormone (Crescormone, Kabi), 4 U/m2. Growth hormone has been administered for 1.0 to 6.8 years but was stopped one week prior to this investigation. Basal levels of VIII C, VIII C:Ag, VIII R:Ag, and R:Cof were within the normal limits. After administration of human growth hormone, VIII C, VIII C:Ag, VIII R:Ag, and R:Cof showed a significant rise. Our study shows that growth hormone is not necessary to maintain the basal levels of the factor VIII complex within the normal limits. However, out data suggest that growth hormone has some influences on the levels of the factor VIII complex. The mechanisms for the rise of the factor VIII complex--whether this is a direct effect of growth hormone or not--are not clear at this point.