Increase or decrease hydrogen sulfide exert opposite lipolysis, but reduce global insulin resistance in high fatty diet induced obese mice.
OBJECTIVE
Adipose tissue expressed endogenous cystathionine gamma lyase (CSE)/hydrogen sulfide (H2S) system. H2S precursor inhibited catecholamine stimulated lipolysis. Thus, we hypothesized that CSE/H2S system regulates lipolysis which contributed to the pathogenesis of insulin resistance.


METHODS
We treated rat adipocyte with DL-propargylglycine (PAG, a CSE inhibitor), L-cysteine (an H2S precursor) plus pyridoxial phosphate (co-enzyme) or the H2S chronic release donor GYY4137, then the glycerol level was assayed for assessing the lipolysis. Then, the effects of PAG and GYY4137 on insulin resistance in high fatty diet (HFD) induced obese mice were investigated.


RESULTS
Here, we found that PAG time-dependently increased basal or isoproterenol stimulated lipolysis. However, L-cysteine plus pyridoxial phosphate or GYY4137 significantly reduced it. PAG increased phosphorylated protein kinase A substrate, perilipin 1 and hormone sensitive lipase, but L-cysteine and GYY4137 decreased the parameters. In HFD induced obese mice, PAG increased adipose basal lipolysis, thus blunted fat mass increase, resulting in lowering insulin resistance evidenced by reduction of fasting glucose, insulin level, HOMA index, oral glucose tolerance test (OGTT) curve area and elevating the insulin tolerance test (ITT) response. GYY4137 inhibited lipolysis in vivo without increasing fat mass, but also ameliorated the insulin resistance in HFD mice.


CONCLUSIONS
These results implicated that inhibition endogenous CSE/H2S system in adipocytes increased lipolysis by a protein kinase A-perilipin/hormone-sensitive lipase pathway, thus blunted fat mass increase and reduced insulin resistance in obese mice; giving H2S donor decreased lipolysis, also reduced insulin resistance induced by HFD. Our data showed that increase or decrease H2S induced opposite lipolysis, but had the same effect on insulin resistance. The paradoxical regulation may be resulted from different action of H2S on metabolic and endocrine function in adipocyte.
Department of Physiology and Pathophysiology, School of Basic Medical Science, Peking University, Bei Jing, P.R. China.
Bin
B
Geng
Bo
B
Cai
Feng
F
Liao
Yang
Y
Zheng
Qiang
Q
Zeng
Xiaofang
X
Fan
Yongsheng
Y
Gong
Jichun
J
Yang
Qing Hua
QH
Cui
Chaoshu
C
Tang
Guo Heng
GH
Xu
D017667:Adipocytes / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D000480:Alkynes / Q000494:pharmacology*; D000818:Animals; D001786:Blood Glucose / Q000378:metabolism; D002352:Carrier Proteins / Q000378:metabolism; D003542:Cystathionine gamma-Lyase / Q000037:antagonists & inhibitors / Q000378:metabolism; D003545:Cysteine / Q000378:metabolism / Q000494:pharmacology; D059305:Diet, High-Fat / Q000009:adverse effects; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D005990:Glycerol / Q000378:metabolism; D005998:Glycine / Q000031:analogs & derivatives* / Q000494:pharmacology; D006862:Hydrogen Sulfide / Q000378:metabolism*; D007328:Insulin / Q000097:blood; D007333:Insulin Resistance; D007545:Isoproterenol / Q000494:pharmacology; D008066:Lipolysis / Q000187:drug effects*; D051379:Mice; D009025:Morpholines / Q000494:pharmacology; D009765:Obesity / Q000188:drug therapy* / Q000209:etiology / Q000378:metabolism; D009946:Organothiophosphorus Compounds / Q000494:pharmacology; D000070778:Perilipin-1; D010750:Phosphoproteins / Q000378:metabolism; D061251:Primary Cell Culture; D011732:Pyridoxal Phosphate / Q000378:metabolism / Q000494:pharmacology; D051381:Rats; D002787:Sterol Esterase / Q000378:metabolism
D000480:Alkynes; D001786:Blood Glucose; D002352:Carrier Proteins; D004791:Enzyme Inhibitors; C529376:GYY 4137; D007328:Insulin; D009025:Morpholines; D009946:Organothiophosphorus Compounds; D000070778:Perilipin-1; D010750:Phosphoproteins; C000602979:Plin1 protein, mouse; C000602981:Plin1 protein, rat; D011732:Pyridoxal Phosphate; C009055:propargylglycine; D002787:Sterol Esterase; D003542:Cystathionine gamma-Lyase; D003545:Cysteine; D007545:Isoproterenol; D005990:Glycerol; D005998:Glycine; D006862:Hydrogen Sulfide