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    GH strongly affects serum concentrations of mannan-binding lectin: evidence for a new IGF-I independent immunomodulatory effect of GH.

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    Authors
    Hansen, T K
    Thiel, S
    Dall, R
    Rosenfalck, A M
    Trainer, Peter J
    Flyvbjerg, Allan
    Jørgensen, J O
    Christiansen, J S
    Affiliation
    Medical Department M (Endocrinology and Diabetes), Aarhus University Hospital, DK-8000 Aarhus C, Denmark. tkh@dadlnet.dk
    Issue Date
    2001-11
    
    Metadata
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    Abstract
    Studies in animals and humans indicate that GH and IGF-I modulate immune function. Recently, it was reported that GH therapy increased the mortality in critically ill patients. The excessive mortality was almost entirely attributable to septic shock or multiorgan failure, suggesting that a GH-induced modulation of immune function was involved. In the present study, we examined whether GH or IGF-I influences the serum concentrations of mannan-binding lectin (MBL). MBL is a plasma protein of the innate immune system that initiates the complement cascade and activates inflammation after binding to carbohydrate structures on microbial surfaces. We performed a cross-over study of 16 healthy men examined during a control period, and during treatment with either GH or IGF-I for 6 d. The levels of MBL were more than doubled during GH treatment, whereas no changes were observed in the IGF-I group or during the control period (P < 0.001). IGF-I levels were elevated similarly during treatment with GH and IGF-I. Subsequently, we studied 30 healthy persons and 25 GH-deficient (GHD) patients randomized to treatment with GH or placebo in a double-blinded manner, and further included samples from 23 patients with active acromegaly examined before and after treatment with octreotide or the GH-receptor antagonist pegvisomant for 3 months. Baseline concentrations of MBL were lower in GHD patients and higher in acromegalic patients than in healthy subjects (P < 0.02). Treatment with GH doubled the MBL concentrations in healthy subjects and almost quadrupled the concentrations in GHD patients; whereas in acromegalic patients, the levels of MBL were reduced to approximately two thirds of the initial values during treatment with octreotide or pegvisomant. Our results demonstrate that treatment with GH, but not IGF-I, significantly increases MBL concentrations. The clinical consequences of this new link between the endocrine and the immune system remain to be elucidated.
    Citation
    GH strongly affects serum concentrations of mannan-binding lectin: evidence for a new IGF-I independent immunomodulatory effect of GH. 2001, 86 (11):5383-8 J. Clin. Endocrinol. Metab.
    Journal
    The Journal of Clinical Endocrinology and Metabolism
    URI
    http://hdl.handle.net/10541/81997
    PubMed ID
    11701711
    Type
    Article
    Language
    en
    ISSN
    0021-972X
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    All Christie Publications

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