Promoted interaction of nuclear factor-κB with demethylated cystathionine-β-synthetase gene contributes to gastric hypersensitivity in diabetic rats

Hong Hong Zhang, Ji Hu, You Lang Zhou, Shufen Hu, Yong Meng Wang, Wei Chen, Ying Xiao, Li-Yen Huang, Xinghong Jiang, Guang Yin Xu

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Patients with long-standing diabetes frequently demonstrate gastric hypersensitivity with an unknown mechanism. The present study was designed to investigate roles for nuclear factor-κB (NF-κB) and the endogenous H2S-producing enzyme cystathionine-β-synthetase (CBS) signaling pathways by examining cbs gene methylation status in adult rats with diabetes. Intraperitoneal injection of streptozotocin (STZ) produced gastric hypersensitivity in female rats in response to gastric balloon distention. Treatment with the CBS inhibitor aminooxyacetic acid significantly attenuated STZ-induced gastric hypersensitivity in a dose-dependent fashion. Aminooxyacetic acid treatment also reversed hyperexcitability of gastric-specific dorsal root ganglion (DRG) neurons labeled by the dye DiI in diabetic rats. Conversely, the H2S donor NaHS enhanced neuronal excitability of gastric DRG neurons. Expression of CBS and p65 were markedly enhanced in gastric DRGs in diabetic rats. Blockade of NF-κB signaling using pyrrolidine dithiocarbamate reversed the upregulation of CBS expression. Interestingly, STZ treatment led to a significant demethylation of CpG islands in the cbs gene promoter region, as determined by methylation-specific PCR and bisulfite sequencing. STZ treatment also remarkably downregulated the expression of DNA methyltransferase 3a and 3b. More importantly, STZ treatment significantly enhanced the ability of cbs to bind DNA at the p65 consensus site, as shown by chromatin immunoprecipitation assays. Our findings suggest that upregulation of cbs expression is attributed to cbs promoter DNA demethylation and p65 activation and that the enhanced interaction of the cbs gene and p65 contributes to gastric hypersensitivity in diabetes. This finding may guide the development and evaluation of new treatment modalities for patients with diabetic gastric hypersensitivity.

Original languageEnglish (US)
Pages (from-to)9028-9038
Number of pages11
JournalJournal of Neuroscience
Volume33
Issue number21
DOIs
StatePublished - May 22 2013

Fingerprint

Cystathionine beta-Synthase
Stomach
Hypersensitivity
Streptozocin
Genes
Aminooxyacetic Acid
Spinal Ganglia
Methylation
Gastric Balloon
Up-Regulation
Therapeutics
Neurons
CpG Islands
Chromatin Immunoprecipitation
Diagnosis-Related Groups
DNA
Intraperitoneal Injections
Genetic Promoter Regions
Coloring Agents
Down-Regulation

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Promoted interaction of nuclear factor-κB with demethylated cystathionine-β-synthetase gene contributes to gastric hypersensitivity in diabetic rats. / Zhang, Hong Hong; Hu, Ji; Zhou, You Lang; Hu, Shufen; Wang, Yong Meng; Chen, Wei; Xiao, Ying; Huang, Li-Yen; Jiang, Xinghong; Xu, Guang Yin.

In: Journal of Neuroscience, Vol. 33, No. 21, 22.05.2013, p. 9028-9038.

Research output: Contribution to journalArticle

Zhang, Hong Hong ; Hu, Ji ; Zhou, You Lang ; Hu, Shufen ; Wang, Yong Meng ; Chen, Wei ; Xiao, Ying ; Huang, Li-Yen ; Jiang, Xinghong ; Xu, Guang Yin. / Promoted interaction of nuclear factor-κB with demethylated cystathionine-β-synthetase gene contributes to gastric hypersensitivity in diabetic rats. In: Journal of Neuroscience. 2013 ; Vol. 33, No. 21. pp. 9028-9038.
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abstract = "Patients with long-standing diabetes frequently demonstrate gastric hypersensitivity with an unknown mechanism. The present study was designed to investigate roles for nuclear factor-κB (NF-κB) and the endogenous H2S-producing enzyme cystathionine-β-synthetase (CBS) signaling pathways by examining cbs gene methylation status in adult rats with diabetes. Intraperitoneal injection of streptozotocin (STZ) produced gastric hypersensitivity in female rats in response to gastric balloon distention. Treatment with the CBS inhibitor aminooxyacetic acid significantly attenuated STZ-induced gastric hypersensitivity in a dose-dependent fashion. Aminooxyacetic acid treatment also reversed hyperexcitability of gastric-specific dorsal root ganglion (DRG) neurons labeled by the dye DiI in diabetic rats. Conversely, the H2S donor NaHS enhanced neuronal excitability of gastric DRG neurons. Expression of CBS and p65 were markedly enhanced in gastric DRGs in diabetic rats. Blockade of NF-κB signaling using pyrrolidine dithiocarbamate reversed the upregulation of CBS expression. Interestingly, STZ treatment led to a significant demethylation of CpG islands in the cbs gene promoter region, as determined by methylation-specific PCR and bisulfite sequencing. STZ treatment also remarkably downregulated the expression of DNA methyltransferase 3a and 3b. More importantly, STZ treatment significantly enhanced the ability of cbs to bind DNA at the p65 consensus site, as shown by chromatin immunoprecipitation assays. Our findings suggest that upregulation of cbs expression is attributed to cbs promoter DNA demethylation and p65 activation and that the enhanced interaction of the cbs gene and p65 contributes to gastric hypersensitivity in diabetes. This finding may guide the development and evaluation of new treatment modalities for patients with diabetic gastric hypersensitivity.",
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