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2018 ; 8
(1
): 4607
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Helminth infection protects against high fat diet-induced obesity via induction
of alternatively activated macrophages
#MMPMID29545532
Su CW
; Chen CY
; Li Y
; Long SR
; Massey W
; Kumar DV
; Walker WA
; Shi HN
Sci Rep
2018[Mar]; 8
(1
): 4607
PMID29545532
show ga
Epidemiological studies indicate an inverse correlation between the prevalence of
the so-called western diseases, such as obesity and metabolic syndrome, and the
exposure to helminths. Obesity, a key risk factor for many chronic health
problems, is rising globally and is accompanied by low-grade inflammation in
adipose tissues. The precise mechanism by which helminths modulate metabolic
syndrome and obesity is not fully understood. We infected high fat diet
(HFD)-induced obese mice with the intestinal nematode parasite Heligmosomoides
polygyrus and observed that helminth infection resulted in significantly
attenuated obesity. Attenuated obesity corresponded with marked upregulation of
uncoupling protein 1 (UCP1), a key protein involved in energy expenditure, in
adipose tissue, suppression of glucose and triglyceride levels, and alteration in
the expression of key genes involved in lipid metabolism. Moreover, the
attenuated obesity in infected mice was associated with enhanced helminth-induced
Th2/Treg responses and M2 macrophage polarization. Adoptive transfer of
helminth-stimulated M2 cells to mice that were not infected with H. polygyrus
resulted in a significant amelioration of HFD-induced obesity and increased
adipose tissue browning. Thus, our results provide evidence that the
helminth-dependent protection against obesity involves the induction of M2
macrophages.