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2016 ; 40
(9
): 1424-34
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Cathelicidin suppresses lipid accumulation and hepatic steatosis by inhibition of
the CD36 receptor
#MMPMID27163748
Hoang-Yen Tran D
; Hoang-Ngoc Tran D
; Mattai SA
; Sallam T
; Ortiz C
; Lee EC
; Robbins L
; Ho S
; Lee JE
; Fisseha E
; Shieh C
; Sideri A
; Shih DQ
; Fleshner P
; McGovern DP
; Vu M
; Hing TC
; Bakirtzi K
; Cheng M
; Su B
; Law I
; Karagiannides I
; Targan SR
; Gallo RL
; Li Z
; Koon HW
Int J Obes (Lond)
2016[Sep]; 40
(9
): 1424-34
PMID27163748
show ga
BACKGROUND AND OBJECTIVES: Obesity is a global epidemic which increases the risk
of the metabolic syndrome. Cathelicidin (LL-37 and mCRAMP) is an antimicrobial
peptide with an unknown role in obesity. We hypothesize that cathelicidin
expression correlates with obesity and modulates fat mass and hepatic steatosis.
MATERIALS AND METHODS: Male C57BL/6?J mice were fed a high-fat diet.
Streptozotocin was injected into mice to induce diabetes. Experimental groups
were injected with cathelicidin and CD36 overexpressing lentiviruses. Human
mesenteric fat adipocytes, mouse 3T3-L1 differentiated adipocytes and human HepG2
hepatocytes were used in the in vitro experiments. Cathelicidin levels in
non-diabetic, prediabetic and type II diabetic patients were measured by
enzyme-linked immunosorbent assay. RESULTS: Lentiviral cathelicidin
overexpression reduced hepatic steatosis and decreased the fat mass of high-fat
diet-treated diabetic mice. Cathelicidin overexpression reduced mesenteric fat
and hepatic fatty acid translocase (CD36) expression that was reversed by
lentiviral CD36 overexpression. Exposure of adipocytes and hepatocytes to
cathelicidin significantly inhibited CD36 expression and reduced lipid
accumulation. Serum cathelicidin protein levels were significantly increased in
non-diabetic and prediabetic patients with obesity, compared with non-diabetic
patients with normal body mass index (BMI) values. Prediabetic patients had lower
serum cathelicidin protein levels than non-diabetic subjects. CONCLUSIONS:
Cathelicidin inhibits the CD36 fat receptor and lipid accumulation in adipocytes
and hepatocytes, leading to a reduction of fat mass and hepatic steatosis in
vivo. Circulating cathelicidin levels are associated with increased BMI. Our
results demonstrate that cathelicidin modulates the development of obesity.