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Liao MC, Lo CS, Pang YC, Yang WX, Su K, Zhao XP, Miyata KN, Peng J, Ingelfinger JR, Chan JSD, Zhang SL. Heterogeneous nuclear ribonucleoprotein F deficiency in mouse podocyte promotes podocytopathy mediated by methyltransferase-like 14 nuclear translocation resulting in Sirtuin 1 gene inhibition. Transl Res 2024; 267:1-9. [PMID: 38195017 DOI: 10.1016/j.trsl.2024.01.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 11/25/2023] [Accepted: 01/06/2024] [Indexed: 01/11/2024]
Abstract
Heterogeneous nuclear ribonucleoprotein F (HnRNP F) is a key regulator for nucleic acid metabolism; however, whether HnRNP F expression is important in maintaining podocyte integrity is unclear. Nephroseq analysis from a registry of human kidney biopsies was performed. Age- and sex-matched podocyte-specific HnRNP F knockout (HnRNP FPOD KO) mice and control (HnRNP Ffl/fl) were studied. Podocytopathy was induced in male mice (more susceptible) either by adriamycin (ADR)- or low-dose streptozotocin treatment for 2 or 8 weeks. The mouse podocyte cell line (mPODs) was used in vitro. Nephroseq data in three human cohorts were varied greatly. Both sexes of HnRNP FPOD KO mice were fertile and appeared grossly normal. However, male 20-week-old HnRNP FPOD KO than HnRNP Ffl/fl mice had increased urinary albumin/creatinine ratio, and lower expression of podocyte markers. ADR- or diabetic- HnRNP FPOD KO (vs. HnRNP Ffl/fl) mice had more severe podocytopathy. Moreover, methyltransferase-like 14 (Mettl14) gene expression was increased in podocytes from HnRNP FPOD KO mice, further enhanced in ADR- or diabetic-treated HnRNP FPOD KO mice. Consequently, this elevated Mettl14 expression led to sirtuin1 (Sirt1) inhibition, associated with podocyte loss. In mPODs, knock-down of HnRNP F promoted Mettl14 nuclear translocation, which was associated with podocyte dysmorphology and Sirt1 inhibition-mediated podocyte loss. This process was more severe in ADR- or high glucose- treated mPODs. Conclusion: HnRNP F deficiency in podocytes promotes podocytopathy through activation of Mettl14 expression and its nuclear translocation to inhibit Sirt1 expression, underscoring the protective role of HnRNP F against podocyte injury.
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Affiliation(s)
- Min-Chun Liao
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Saint Denis Street, Montréal, QC H2×0A9, Canada
| | - Chao-Sheng Lo
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Saint Denis Street, Montréal, QC H2×0A9, Canada
| | - Yu-Chao Pang
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Saint Denis Street, Montréal, QC H2×0A9, Canada
| | - Wen-Xia Yang
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Saint Denis Street, Montréal, QC H2×0A9, Canada
| | - Ke Su
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Saint Denis Street, Montréal, QC H2×0A9, Canada
| | - Xin-Ping Zhao
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Saint Denis Street, Montréal, QC H2×0A9, Canada
| | - Kana N Miyata
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Saint Denis Street, Montréal, QC H2×0A9, Canada; Division of Nephrology, Department of Internal Medicine, Saint Louis University, 1008 Spring Ave. St Louis, MO 63110, USA
| | - Junzheng Peng
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Saint Denis Street, Montréal, QC H2×0A9, Canada
| | - Julie R Ingelfinger
- Pediatric Nephrology Unit, Mass General Hospital for Children at Massachusetts General Hospital, Harvard Medical School, 55 Fruit Street, Boston, MA, 02114, USA
| | - John S D Chan
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Saint Denis Street, Montréal, QC H2×0A9, Canada.
| | - Shao-Ling Zhang
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), 900 Saint Denis Street, Montréal, QC H2×0A9, Canada.
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Zhao XP, Chang SY, Pang Y, Liao MC, Peng J, Ingelfinger JR, Chan JSD, Zhang SL. Hedgehog interacting protein activates sodium-glucose cotransporter 2 expression and promotes renal tubular epithelial cell senescence in a mouse model of type 1 diabetes. Diabetologia 2023; 66:223-240. [PMID: 36260124 DOI: 10.1007/s00125-022-05810-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 08/17/2022] [Indexed: 12/13/2022]
Abstract
AIMS/HYPOTHESIS Senescent renal tubular cells may be linked to diabetic kidney disease (DKD)-related tubulopathy. We studied mice with or without diabetes in which hedgehog interacting protein (HHIP) was present or specifically knocked out in renal tubules (HhipRT-KO), hypothesising that local deficiency of HHIP in the renal tubules would attenuate tubular cell senescence, thereby preventing DKD tubulopathy. METHODS Low-dose streptozotocin was employed to induce diabetes in both HhipRT-KO and control (Hhipfl/fl) mice. Transgenic mice overexpressing Hhip in renal proximal tubular cells (RPTC) (HhipRPTC-Tg) were used for validation, and primary RPTCs and human RPTCs (HK2) were used for in vitro studies. Kidney morphology/function, tubular senescence and the relevant molecular measurements were assessed. RESULTS Compared with Hhipfl/fl mice with diabetes, HhipRT-KO mice with diabetes displayed lower blood glucose levels, normalised GFR, ameliorated urinary albumin/creatinine ratio and less severe DKD, including tubulopathy. Sodium-glucose cotransporter 2 (SGLT2) expression was attenuated in RPTCs of HhipRT-KO mice with diabetes compared with Hhipfl/fl mice with diabetes. In parallel, an increased tubular senescence-associated secretory phenotype involving release of inflammatory cytokines (IL-1β, IL-6 and monocyte chemoattractant protein-1) and activation of senescence markers (p16, p21, p53) in Hhipfl/fl mice with diabetes was attenuated in HhipRT-KO mice with diabetes. In contrast, HhipRPTC-Tg mice had increased tubular senescence, which was inhibited by canagliflozin in primary RPTCs. In HK2 cells, HHIP overexpression or recombinant HHIP increased SGLT2 protein expression and promoted cellular senescence by targeting both ataxia-telangiectasia mutated and ataxia-telangiectasia and Rad3-related-mediated cell arrest. CONCLUSIONS/INTERPRETATION Tubular HHIP deficiency prevented DKD-related tubulopathy, possibly via the inhibition of SGLT2 expression and cellular senescence.
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Affiliation(s)
- Xin-Ping Zhao
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Shiao-Ying Chang
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Yuchao Pang
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Min-Chun Liao
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Junzheng Peng
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Julie R Ingelfinger
- Harvard Medical School, Pediatric Nephrology Unit, Massachusetts General Hospital, Boston, MA, USA
| | - John S D Chan
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Shao-Ling Zhang
- Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Department of Medicine, Université de Montréal, Montréal, QC, Canada.
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Protecting glomerulus: role of angiotensin-II type 2 receptor. Clin Sci (Lond) 2022; 136:1467-1470. [DOI: 10.1042/cs20220396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 09/21/2022] [Accepted: 09/23/2022] [Indexed: 11/17/2022]
Abstract
Abstract
Podocyte injury due to either drug, toxin, infection, or metabolic abnormality is a great concern as it increases the risk of developing focal segmental glomerulosclerosis (FSGS) and proteinuric kidney diseases. The direct podocyte injury due to doxorubicin is associated with an increase in proinflammatory cytokines and induction of cathepsin L. The increased activity of cathepsin L in turn may degrade the glomerular slit diaphragm resulting in proteinuric kidney injury. The angiotensin-II type 2 receptor (AT2R) has earlier been reported to be associated with the preservation of slit diaphragm proteins and prevention of proteinuria. Recent in vivo findings by Zhang and colleagues further support the anti-proteinuric role of AT2R in preventing podocyte injury via down-regulating cytokines ccl2, and hence, cathepsin L, thereby, limiting the progression of FSGS.
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Angiotensin II type-2-receptor stimulation ameliorates focal and segmental glomerulosclerosis in mice. Clin Sci (Lond) 2022; 136:715-731. [PMID: 35502764 PMCID: PMC9851172 DOI: 10.1042/cs20220188] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 04/28/2022] [Accepted: 04/29/2022] [Indexed: 01/21/2023]
Abstract
Podocyte damage and loss are the early event in the development of focal segmental glomerulosclerosis (FSGS). Podocytes express angiotensin II type-2-receptor (AT2R), which may play a key role in maintaining kidney integrity and function. Here, we examined the effects of AT2R deletion and AT2R agonist compound 21 (C21) on the evolution of FSGS. FSGS was induced by adriamycin (ADR) injection in both male wild-type (WT) and AT2R knockout (KO) mice. C21 was administered to WT-FSGS mice either one day before or 7 days after ADR (Pre-C21 or Post-C21), using two doses of C21 at either 0.3 (low dose, LD) or 1.0 (high dose, HD) mg/kg/day. ADR-induced FSGS was more severe in AT2RKO mice compared with WT-FSGS mice, and included profound podocyte loss, glomerular fibrosis, and albuminuria. Glomerular cathepsin L expression increased more in AT2RKO-FSGS than in WT-FSGS mice. C21 treatment ameliorated podocyte injury, most significantly in the Pre C21-HD group, and inhibited glomerular cathepsin L expression. In vitro, Agtr2 knock-down in mouse podocyte cell line given ADR confirmed the in vivo data. Mechanistically, C21 inhibited cathepsin L expression, which protected synaptopodin from destruction and stabilized actin cytoskeleton. C21 also prevented podocyte apoptosis. In conclusion, AT2R activation by C21 ameliorated ADR-induced podocyte injury in mice by the inhibition of glomerular cathepsin L leading to the maintenance of podocyte integrity and prevention of podocyte apoptosis.
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Liao MC, Pang YC, Chang SY, Zhao XP, Chenier I, Ingelfinger JR, Chan JSD, Zhang SL. AT 2R deficiency in mice accelerates podocyte dysfunction in diabetic progeny in a sex-dependent manner. Diabetologia 2021; 64:2108-2121. [PMID: 34047808 DOI: 10.1007/s00125-021-05483-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Accepted: 03/11/2021] [Indexed: 10/21/2022]
Abstract
AIMS/HYPOTHESIS The angiotensin II receptor type 2 (AT2R) may be a potential therapeutic target for the treatment of hypertension and chronic kidney disease (CKD). The expression and function of AT2R in the vasculature and kidney appear sexually dimorphic. We hypothesised that Agtr2 knockout dams (AT2RKO) with gestational diabetes would program their offspring for subsequent hypertension and CKD in a sex-dependent manner. METHODS Age- and sex-matched offspring of non-diabetic and diabetic dams of wild-type (WT) and AT2RKO mice were followed from 4 to 20 weeks of age and were monitored for development of hypertension and nephropathy; a mouse podocyte cell line (mPOD) was also studied. RESULTS Body weight was progressively lower in female compared with male offspring throughout the lifespan. Female but not male offspring from diabetic AT2RKO dams developed insulin resistance. Compared with the offspring of non-diabetic dams, the progeny of diabetic dams had developed more hypertension and nephropathy (apparent glomerulosclerosis with podocyte loss) at 20 weeks of age; this programming was more pronounced in the offspring of AT2RKO diabetic dams, particularly female AT2RKO progeny. Female AT2RKO offspring had lower basal ACE2 glomerular expression, resulting in podocyte loss. The aberrant ACE2/ACE ratio was far more diminished in glomeruli of female progeny of diabetic AT2RKO dams than in male progeny. Knock-down of Agtr2 in mPODs confirmed the in vivo data. CONCLUSIONS/INTERPRETATION AT2R deficiency accelerated kidney programming in female progeny of diabetic dams, possibly due to loss of protective effects of ACE2 expression in the kidney.
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Affiliation(s)
- Min-Chun Liao
- Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | - Yu-Chao Pang
- Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | - Shiao-Ying Chang
- Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | - Xin-Ping Zhao
- Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | - Isabelle Chenier
- Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | - Julie R Ingelfinger
- Pediatric Nephrology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - John S D Chan
- Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | - Shao-Ling Zhang
- Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada.
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Increased AT 2R expression is induced by AT 1R autoantibody via two axes, Klf-5/IRF-1 and circErbB4/miR-29a-5p, to promote VSMC migration. Cell Death Dis 2020; 11:432. [PMID: 32514012 PMCID: PMC7280191 DOI: 10.1038/s41419-020-2643-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Revised: 05/24/2020] [Accepted: 05/26/2020] [Indexed: 02/06/2023]
Abstract
Vascular remodeling can be caused by angiotensin II type 1 receptor (AT1R) autoantibody (AT1-AA), although the related mechanism remains unknown. Angiotensin II type 2 receptor (AT2R) plays multiple roles in vascular remodeling through cross-talk with AT1R in the cytoplasm. Here, we aimed to explore the role and mechanism of AT2R in AT1-AA-induced vascular smooth muscle cell (VSMC) migration, which is a key event in vascular remodeling. In vitro and in vivo, we found that AT2R can promote VSMC migration in AT1-AA-induced vascular remodeling. Moreover, AT2R expression was upregulated via Klf-5/IRF-1-mediated transcriptional and circErbB4/miR-29a-5p-mediated posttranscriptional mechanisms in response to AT1-AA. Our data provide a molecular basis for AT1-AA-induced AT2R expression by transcription factors, namely, a circular RNA and a microRNA, and showed that AT2R participated in AT1-AA-induced VSMC migration during the development of vascular remodeling. AT2R may be a potential target for the treatment of AT1-AA-induced vascular diseases.
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Miyata KN, Zhao XP, Chang SY, Liao MC, Lo CS, Chenier I, Ethier J, Cailhier JF, Lattouf JB, Troyanov S, Chiasson JL, Ingelfinger JR, Chan JSD, Zhang SL. Increased urinary excretion of hedgehog interacting protein (uHhip) in early diabetic kidney disease. Transl Res 2020; 217:1-10. [PMID: 31794697 DOI: 10.1016/j.trsl.2019.11.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 10/21/2019] [Accepted: 11/12/2019] [Indexed: 02/02/2023]
Abstract
Glomerular endothelial cell (GEC) dysfunction occurs in diabetic kidney disease (DKD) and generally precedes albuminuria. We recently reported that hedgehog interacting protein (Hhip), highly expressed in GECs, contributes to DKD development in diabetic mice. Here, we hypothesized that urinary Hhip (uHhip) could identify early DKD; we tested uHhip in mice and humans with diabetes (DM). In both type 1 (Akita) and type 2 (db/db) DM mice, uHhip is elevated prior to the development of albuminuria, while non-DM controls excrete minimal amount of uHhip. In 87 type 2 DM patients and 39 healthy controls, the uHhip/creatinine (Cr) ratio provides a significant discrimination between non-DM and DM groups; 0 [0-69.5] in non-DM, 9.9 [1.7-39.5] in normoalbuminuric DM, 167.7 [95.7-558.7] in microalbuminuric DM, and 207.9 [0-957.2] in macroalbuminuric DM (median [IQR] ng/mmol, P < 0.0001). The log-uHhip/Cr is positively correlated with urine albumin/Cr ratio (UACR) (spearman correlation coefficient 0.47, P < 0.0001). The log-uHhip/Cr is also associated with eGFR, pulse pressure, and urinary cytokines (IL-1β, IL-6, IL-8, and TGFβ1) independent of UACR. By immunostaining, Hhip is localized in glomeruli and tubules, and is increased in human DM kidneys compared with non-DM kidneys. TGFβ1 shares the similar staining pattern as Hhip in human DM kidneys. Thus, uHhip appears to be a novel indicator of diabetic GEC injury and is elevated in early DKD before the development of microalbuminuria in mice and humans. Clinical value for detecting early DKD warrants further investigation.
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Affiliation(s)
- Kana N Miyata
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Quebec, Canada
| | - Xin-Ping Zhao
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Quebec, Canada
| | - Shiao-Ying Chang
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Quebec, Canada
| | - Min-Chun Liao
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Quebec, Canada
| | - Chao-Sheng Lo
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Quebec, Canada
| | - Isabelle Chenier
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Quebec, Canada
| | - Jean Ethier
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Quebec, Canada
| | - Jean-Francois Cailhier
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Quebec, Canada
| | - Jean-Baptiste Lattouf
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Quebec, Canada
| | - Stephan Troyanov
- Nephrology Division, Hôpital du Sacré-Coeur de Montreal, Montreal, Quebec, Canada
| | - Jean-Louis Chiasson
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Quebec, Canada
| | - Julie R Ingelfinger
- Pediatric Nephrology Unit, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - John S D Chan
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Quebec, Canada
| | - Shao-Ling Zhang
- Department of Medicine, Université de Montréal, Centre de recherche du Centre hospitalier de l'Université de Montréal (CRCHUM), Montréal, Quebec, Canada.
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Hedgehog Interacting Protein (Hhip) Regulates Insulin Secretion in Mice Fed High Fat Diets. Sci Rep 2019; 9:11183. [PMID: 31371780 PMCID: PMC6673691 DOI: 10.1038/s41598-019-47633-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 07/15/2019] [Indexed: 12/15/2022] Open
Abstract
Hedgehog interacting protein (Hhip) is essential for islet formation and beta-cell proliferation during pancreatic development; abnormally elevated Hhip expression has been linked to human pancreatitis. Here, we investigate the role of Hhip in modulating insulin secretion in adult Hhip mice (Hhip +/− vs. Hhip+/+) fed high fat diets (HFD). Both sexes of HFD-Hhip +/+ mice developed impaired glucose intolerance, that was only ameliorated in male HFD-Hhip +/− mice that had high levels of circulating plasma insulin, but not in female HFD-Hhip +/− mice. HFD stimulated Hhip gene expression, mainly in beta cells. Male HFD-Hhip +/+ mice had more large islets in which insulin content was reduced; islet architecture was disordered; and markers of oxidative stress (8-OHdG and Nox 2) were increased. In contrast, male HFD-Hhip +/− mice had more small islets with increased beta cell proliferation, enhanced GSIS, less oxidative stress and preserved islet integrity. In vitro, recombinant Hhip increased Nox2 and NADPH activity and decreased insulin-positive beta cells. siRNA-Hhip increased GSIS and abolished the stimulation of sodium palmitate (PA)-BSA on Nox2 gene expression. We conclude that pancreatic Hhip gene inhibits insulin secretion by altering islet integrity and promoting Nox2 gene expression in beta cells in response to HDF-mediated beta cell dysfunction, a novel finding.
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Hedgehog Interacting Protein Promotes Fibrosis and Apoptosis in Glomerular Endothelial Cells in Murine Diabetes. Sci Rep 2018; 8:5958. [PMID: 29654303 PMCID: PMC5899163 DOI: 10.1038/s41598-018-24220-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 03/28/2018] [Indexed: 12/14/2022] Open
Abstract
We investigated whether renal hedgehog interacting protein (Hhip) expression contributes to the progression of diabetic nephropathy (DN) and studied its related mechanism(s) in vivo and in vitro. Here, we show that Hhip expression is highly elevated in glomerular endothelial cells of adult type 1 diabetic (T1D) Akita and T2D db/db mouse kidneys as compared to non-diabetic control littermates. Hyperglycemia enhances reactive oxygen species (ROS) generation via NADPH oxidase 4 (Nox4) activation and stimulates renal Hhip gene expression, and that elevated renal Hhip gene expression subsequently activates the TGFβ1- Smad2/3 cascade and promotes endothelial to mesenchymal transition associated with endothelial cell fibrosis/apoptosis in vivo and in vitro. Furthermore, kidneys of low-dose streptozotocin-induced diabetic heterozygous Hhip deficient (Hhip+/−) mice displayed a normal albumin/creatinine ratio with fewer features of DN (glomerulosclerosis/fibrosis and podocyte apoptosis/loss) and less evidence of renal compensation (glomerular hypertrophy and hyperfiltration) as compared to diabetic wild type controls (Hhip+/+). Thus, our studies demonstrated that renal Hhip expression is associated with nephropathy development in diabetes and that hyperglycemia-induced renal Hhip expression may mediate glomerular endothelial fibrosis and apoptosis in diabetes, a novel finding.
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Shu B, Fang Y, He W, Yang J, Dai C. Identification of macrophage-related candidate genes in lupus nephritis using bioinformatics analysis. Cell Signal 2018; 46:43-51. [PMID: 29458096 DOI: 10.1016/j.cellsig.2018.02.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Revised: 02/14/2018] [Accepted: 02/15/2018] [Indexed: 01/02/2023]
Abstract
Lupus nephritis (LN) is a chronic autoimmune disorder. Here we try to identify the candidate genes in macrophages related to LN. We performed a systematic search in the Gene Expression Omnibus (GEO) database for microarray in human mononuclear cells and mouse macrophages of LN. The results of clustering and venn analysis of different GEO datasets showed that 8 genes were up-regulated and 2 genes down-regulated in samples from both human and mouse LN. The data from gene network and GO analysis revealed that CD38 and CCL2 were localized in the core of the network. Immunofluorescence staining showed that CD38 expression was markedly increased in macrophages from kidneys with LN. Our study identifies the gene expression profile for macrophages and demonstrated the induction of CCL2 and CD38 in macrophages from patients with LN. However, regarding the limited patient number included in this study, the results are preliminary and more studies are still needed to further decipher the macrophage-related candidate genes for the pathogenesis of LN.
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Affiliation(s)
- Bingyan Shu
- Center for Kidney Disease, 2nd Affiliated Hospital of Nanjing Medical University, 262 North Zhongshan Road, Nanjing, Jiangsu, China
| | - Yi Fang
- Center for Kidney Disease, 2nd Affiliated Hospital of Nanjing Medical University, 262 North Zhongshan Road, Nanjing, Jiangsu, China
| | - Weichun He
- Center for Kidney Disease, 2nd Affiliated Hospital of Nanjing Medical University, 262 North Zhongshan Road, Nanjing, Jiangsu, China
| | - Junwei Yang
- Center for Kidney Disease, 2nd Affiliated Hospital of Nanjing Medical University, 262 North Zhongshan Road, Nanjing, Jiangsu, China
| | - Chunsun Dai
- Center for Kidney Disease, 2nd Affiliated Hospital of Nanjing Medical University, 262 North Zhongshan Road, Nanjing, Jiangsu, China.
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