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LPS and HIV gp120 modulate monocyte/macrophage CYP27B1 and CYP24A1 expression leading to vitamin D consumption and hypovitaminosis D in HIV-infected individuals

Pinzone, Marilia Rita and Di Rosa, Michelino and Celesia, Benedetto Maurizio and Condorelli, Fabrizio and Malaguarnera, Mariano and Madeddu, Giuseppe and Martellotta, Ferdinando and Castronuovo, D. and Gussio, Maria and Coco, Christian and Palermo, F. and Cosentino, Stefano and Cacopardo, Bruno and Nunnari, Giuseppe (2013) LPS and HIV gp120 modulate monocyte/macrophage CYP27B1 and CYP24A1 expression leading to vitamin D consumption and hypovitaminosis D in HIV-infected individuals. European Review for Medical and Pharmacological Sciences, Vol. 17 (14), p. 1938-1950. ISSN 1128-3602. Article.

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AIM: Vitamin D deficiency is very common among HIV-infected subjects. We cross-sectionally evaluated the prevalence and risk factors for hypovitaminosis D in 91 HIV-infected Italian patients.
PATIENTS AND METHODS: We studied in a cohort of 91 HIV-infected Italian patients the metabolism of Vitamin D by evaluating the in vitro expression of CYP27B1, CYP24A1 and vitamin D receptor (VDR) by monocytes and macrophages stimulated with the viral envelope protein gp120 or lipopolysaccharide (LPS).
RESULTS: The prevalence of vitamin D deficiency (25OHD < 10 ng/ml) and vitamin D insufficiency (25OHD 10-30 ng/ml) was 31% and 57%, respectively. In univariate analysis, female sex (p = 0.01), increasing age (p = 0.05), higher highly sensitive-C reactive protein (p = 0.025), higher parathyroid hormone (PTH) (p = 0.043) and lower BMI (p = 0.04) were associated with vitamin D deficiency. In multivariate analysis, the association was still significant only for PTH (p = 0.03) and female sex (p = 0.03).
Monocyte stimulation with LPS (100 ng/ml) or gp120 (1 µg/ml) significantly upregulated CYP27B1 mRNA expression. Moreover, gp120 significantly increased VDR mRNA levels. On the contrary, neither LPS nor gp120 modified CYP24A1 levels. Macrophage stimulation with LPS (100 ng/ml) significantly upregulated CYP27B1 and CYP24A1 mRNA expression.
When monocytes were cultured in the presence of 25OHD (40 ng/ml) and stimulated with LPS we detected significantly lower levels of 25OHD in the supernatant.
CONCLUSIONS: Vitamin D deficiency was very common in our cohort of HIV-infected patients. Chronic inflammation, including residual viral replication, may contribute to hypovitaminosis D, by modulating vitamin D metabolism and catabolism. Systematic screening may help identifying subjects requiring supplementation.

Item Type:Article
ID Code:9245
Uncontrolled Keywords:Gp 120, HIV-infected patients, lipopolysaccharide, parathormone, vitamin D deficiency, vitamin D receptor
Subjects:Area 06 - Scienze mediche > MED/36 Diagnostica per immagini e radioterapia
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Medicina Clinica e Sperimentale
Deposited On:03 Oct 2013 10:08

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