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Biswal J, Sen N, Joseph A, Sharma VK, Singh KK, Shenoy KT, Pant HJ. A microfluidic route for synthesis of scandium oxide microspheres, their characterization and neutron activation. Appl Radiat Isot 2024; 207:111245. [PMID: 38430827 DOI: 10.1016/j.apradiso.2024.111245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 02/18/2024] [Accepted: 02/19/2024] [Indexed: 03/05/2024]
Abstract
Radioactive scandium-46 microspheres have applications in mapping flow in a chemical reactor through a technique known as radioactive particle tracking (RPT). In the present study a novel microfluidic method has been developed for synthesis of controlled size scandium oxide microspheres. An inline/in-situ mixing of the scandium precursor and gelling agents was implemented which makes the microfluidic platform amenable for truly continuous operation. Microspheres of size varying from 937 to 666 μm were produced by varying O/A ratio from 10 to 30. Perfectly spherical and monodispersed (PDI <10 %) microspheres were obtained at O/A 15 and beyond. The morphology, elemental composition, and structure of the microspheres were analysed by SEM, EDS and XRD, respectively. Subsequently the microspheres were irradiated with thermal neutrons in a nuclear reactor to obtain radioactive Sc-46 oxide microspheres. The activity produced on each Sc-46 microspheres with different sizes was in the range 19.5-34.0 MBq.
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Affiliation(s)
- Jayashree Biswal
- Isotope and Radiation Application Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India; Homi Bhabha National Institute, Anushakti Nagar, Mumbai, 400094, India
| | - Nirvik Sen
- Chemical Engineering Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
| | - Annie Joseph
- Process Development Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
| | - V K Sharma
- Isotope and Radiation Application Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
| | - K K Singh
- Chemical Engineering Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
| | - K T Shenoy
- Chemical Engineering Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
| | - H J Pant
- Isotope and Radiation Application Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India.
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Bu S, Singh A, Nguyen HC, Peddi B, Bhatt K, Ravendranathan N, Frisbee JC, Singh KK. Protein Disulfide Isomerase 4 Is an Essential Regulator of Endothelial Function and Survival. Int J Mol Sci 2024; 25:3913. [PMID: 38612722 PMCID: PMC11011381 DOI: 10.3390/ijms25073913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Revised: 03/29/2024] [Accepted: 03/29/2024] [Indexed: 04/14/2024] Open
Abstract
Endothelial autophagy plays an important role in the regulation of endothelial function. The inhibition of endothelial autophagy is associated with the reduced expression of protein disulfide isomerase 4 (PDIA-4); however, its role in endothelial cells is not known. Here, we report that endothelial cell-specific loss of PDIA-4 leads to impaired autophagic flux accompanied by loss of endothelial function and apoptosis. Endothelial cell-specific loss of PDIA-4 also induced marked changes in endothelial cell architecture, accompanied by the loss of endothelial markers and the gain of mesenchymal markers consistent with endothelial-to-mesenchymal transition (EndMT). The loss of PDIA-4 activated TGFβ-signaling, and inhibition of TGFβ-signaling suppressed EndMT in PDIA-4-silenced endothelial cells in vitro. Our findings help elucidate the role of PDIA-4 in endothelial autophagy and endothelial function and provide a potential target to modulate endothelial function and/or limit autophagy and EndMT in (patho-)physiological conditions.
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Affiliation(s)
- Shuhan Bu
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, 1151 Richmond St. N., London, ON N6A 3K7, Canada; (S.B.); (A.S.); (H.C.N.); (B.P.); (K.B.); (N.R.); (J.C.F.)
| | - Aman Singh
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, 1151 Richmond St. N., London, ON N6A 3K7, Canada; (S.B.); (A.S.); (H.C.N.); (B.P.); (K.B.); (N.R.); (J.C.F.)
| | - Hien C. Nguyen
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, 1151 Richmond St. N., London, ON N6A 3K7, Canada; (S.B.); (A.S.); (H.C.N.); (B.P.); (K.B.); (N.R.); (J.C.F.)
- Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON N6A 3K7, Canada
| | - Bharatsinai Peddi
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, 1151 Richmond St. N., London, ON N6A 3K7, Canada; (S.B.); (A.S.); (H.C.N.); (B.P.); (K.B.); (N.R.); (J.C.F.)
| | - Kriti Bhatt
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, 1151 Richmond St. N., London, ON N6A 3K7, Canada; (S.B.); (A.S.); (H.C.N.); (B.P.); (K.B.); (N.R.); (J.C.F.)
| | - Naresh Ravendranathan
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, 1151 Richmond St. N., London, ON N6A 3K7, Canada; (S.B.); (A.S.); (H.C.N.); (B.P.); (K.B.); (N.R.); (J.C.F.)
| | - Jefferson C. Frisbee
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, 1151 Richmond St. N., London, ON N6A 3K7, Canada; (S.B.); (A.S.); (H.C.N.); (B.P.); (K.B.); (N.R.); (J.C.F.)
| | - Krishna K. Singh
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, 1151 Richmond St. N., London, ON N6A 3K7, Canada; (S.B.); (A.S.); (H.C.N.); (B.P.); (K.B.); (N.R.); (J.C.F.)
- Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON N6A 3K7, Canada
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Singh A, Kaur M, Swaminathan C, Siby J, Singh KK, Sajid MS. Laparoscopic versus robotic cholecystectomy: a systematic review with meta-analysis to differentiate between postoperative outcomes and cost-effectiveness. Transl Gastroenterol Hepatol 2024; 9:3. [PMID: 38317744 PMCID: PMC10838610 DOI: 10.21037/tgh-23-56] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Accepted: 11/16/2023] [Indexed: 02/07/2024] Open
Abstract
Background Robotic cholecystectomy (RC) has shown promising outcomes in multiple studies when compared with the gold standard laparoscopic cholecystectomy (LC). The objective of this study is to compare the postoperative surgical outcomes and cost in patients undergoing RC versus LC. Methods Studies reporting postoperative outcomes and costs in patients undergoing RC versus LC were selected from medical electronic databases and analysis was conducted by the values of systematic review on the statistical software RevMan version 5. Results Six trials on 1,013 affected individuals for post-operative outcomes and cost comparison were used. Random effect model analysis was used in the analysis. Duration of operation (mean difference: -10.23, 95% CI: -16.23 to -4.22, Z=3.34, P=0.0008) was shorter in the LC group with moderate heterogeneity. Bile leak (odds ratio: 3.34, 95% CI: 0.85 to 13.03, Z=1.73, P=0.08) and no heterogeneity was seen, Postoperative complications (odds ratio: 1.49, 95% CI: 0.50 to 4.46, Z=0.72, P=0.47) with moderate heterogeneity. Both were statistically similar. LC had reduced cost (standardised mean difference: -7.42, 95% CI: -13.10 to -1.74, Z=2.56, P=0.01) with significant heterogeneity. Conclusions RC failed to prove any clinical advantage over LC for postoperative outcomes including longer duration of operation moreover LC was more cost effective. Due to the paucity of randomised control trial (RCT) and significant heterogeneity, a major multicentre RCT is required to strengthen and validate the findings.
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Affiliation(s)
| | | | - Christie Swaminathan
- Department of Gastrointestinal Surgery, Royal Sussex County Hospital, Brighton, UK
| | | | - Krishna K. Singh
- Department of Gastrointestinal Surgery, Royal Sussex County Hospital, Brighton, UK
| | - Muhammad S. Sajid
- Department of Gastrointestinal Surgery, Royal Sussex County Hospital, Brighton, UK
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Halvorson BD, Bao Y, Singh KK, Frisbee SJ, Hachinski V, Whitehead SN, Melling CWJ, Chantler PD, Goldman D, Frisbee JC. Thromboxane-induced cerebral microvascular rarefaction predicts depressive symptom emergence in metabolic disease. J Appl Physiol (1985) 2024; 136:122-140. [PMID: 37969083 DOI: 10.1152/japplphysiol.00410.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 11/14/2023] [Accepted: 11/14/2023] [Indexed: 11/17/2023] Open
Abstract
Previous studies have suggested that the loss of microvessel density in the peripheral circulation with evolving metabolic disease severity represents a significant contributor to impaired skeletal muscle oxygenation and fatigue-resistance. Based on this and our recent work, we hypothesized that cerebral microvascular rarefaction was initiated from the increased prooxidant and proinflammatory environment with metabolic disease and is predictive of the severity of the emergence of depressive symptoms in obese Zucker rats (OZRs). In male OZR, cerebrovascular rarefaction followed the emergence of elevated oxidant and inflammatory environments characterized by increased vascular production of thromboxane A2 (TxA2). The subsequent emergence of depressive symptoms in OZR was associated with the timing and severity of the rarefaction. Chronic intervention with antioxidant (TEMPOL) or anti-inflammation (pentoxifylline) therapy blunted the severity of rarefaction and depressive symptoms, although the effectiveness was limited. Blockade of TxA2 production (dazmegrel) or action (SQ-29548) resulted in a stronger therapeutic effect, suggesting that vascular production and action represent a significant contributor to rarefaction and the emergence of depressive symptoms with chronic metabolic disease (although other pathways clearly contribute as well). A de novo biosimulation of cerebrovascular oxygenation in the face of progressive rarefaction demonstrates the increased probability of generating hypoxic regions within the microvascular networks, which could contribute to impaired neuronal metabolism and the emergence of depressive symptoms. The results of the present study also implicate the potential importance of aggressive prodromic intervention in reducing the severity of chronic complications arising from metabolic disease.NEW & NOTEWORTHY With clinical studies linking vascular disease risk to depressive symptom emergence, we used obese Zucker rats, a model of chronic metabolic disease, to identify potential mechanistic links between these two negative outcomes. Depressive symptom severity correlated with the extent of cerebrovascular rarefaction, after increased vascular oxidant stress/inflammation and TxA2 production. Anti-TxA2 interventions prevasculopathy blunted rarefaction and depressive symptoms, while biosimulation indicated that cerebrovascular rarefaction increased hypoxia within capillary networks as a potential contributing mechanism.
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Affiliation(s)
- Brayden D Halvorson
- Department of Medical Biophysics, University of Western Ontario, London, Ontario, Canada
| | - Yuki Bao
- Department of Biomedical Engineering, University of Western Ontario, London, Ontario, Canada
| | - Krishna K Singh
- Department of Medical Biophysics, University of Western Ontario, London, Ontario, Canada
| | - Stephanie J Frisbee
- Department of Pathology and Laboratory Medicine, University of Western Ontario, London, Ontario, Canada
| | - Vladimir Hachinski
- Department of Anatomy and Cell Biology, University of Western Ontario, London, Ontario, Canada
| | - Shawn N Whitehead
- Department of Anatomy and Cell Biology, University of Western Ontario, London, Ontario, Canada
| | - C W James Melling
- Department of Kinesiology, University of Western Ontario, London, Ontario, Canada
| | - Paul D Chantler
- Division of Exercise Physiology, West Virginia University, Morgantown, West Virginia, United States
| | - Daniel Goldman
- Department of Medical Biophysics, University of Western Ontario, London, Ontario, Canada
| | - Jefferson C Frisbee
- Department of Medical Biophysics, University of Western Ontario, London, Ontario, Canada
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Peristeri DV, Nour HM, Ahsan A, Abogabal S, Singh KK, Sajid MS. Alcohol-Containing Versus Aqueous-Based Solutions for Skin Preparation in Abdominal Surgery: A Systematic Review and Meta-analysis. J Surg Res 2023; 291:734-741. [PMID: 37573638 DOI: 10.1016/j.jss.2023.06.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 04/17/2023] [Accepted: 06/13/2023] [Indexed: 08/15/2023]
Abstract
INTRODUCTION The use of optimal skin antiseptic agents for the prevention of surgical site infection (SSI) is of critical importance, especially during abdominal surgical procedures. Alcohol-based chlorhexidine gluconate (CHG) and aqueous-based povidone-iodine (PVI) are the two most common skin antiseptics used nowadays. The objective of this article is to evaluate the effectiveness of alcohol-based CHG versus aqueous-based PVI used for skin preparation before abdominal surgery to reduce SSIs. METHODS Standard medical databases such as MEDLINE, Embase, Pubmed, and Cochrane Library were searched to find randomized, controlled trials comparing alcohol-based CHG skin preparation versus aqueous-based PVI in patients undergoing abdominal surgery. The combined outcomes of SSIs were calculated using odds ratio with 95% confidence intervals. All data were analyzed using Review Manager Software 5.4, and the meta-analysis was performed with a random effect model analysis. RESULTS A total of 11 studies, all randomized, controlled trials, were included (n = 12,072 participants), recruiting adult patients undergoing abdominal surgery. In the random effect model analysis, the use of alcohol-based CHG in patients undergoing abdominal surgery was associated with a reduced risk of SSI compared to aqueous-based PVI (odds ratio: 0.84; 95% confidence interval [0.74, 0.96], z = 2.61, P = 0.009). CONCLUSIONS Alcohol-based CHG may be more effective for preventing the risk of SSI compared to aqueous-based PVI agents in abdominal surgery. The conclusion of this meta-analysis may add a guiding value to reinforce current clinical practice guidelines.
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Affiliation(s)
- Dimitra V Peristeri
- Department of Gastrointestinal Surgery, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK.
| | - Hussameldin M Nour
- Department of Gastrointestinal Surgery, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - Amiya Ahsan
- Department of Gastrointestinal Surgery, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - Sameh Abogabal
- Department of Gastrointestinal Surgery, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - Krishna K Singh
- Department of Gastrointestinal Surgery, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - Muhammad Shafique Sajid
- Department of Gastrointestinal Surgery, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
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Singh A, Kaur M, Swaminathan C, Subramanian A, Singh KK, Sajid MS. Preoperative antibiotic prophylaxis in acute cholecystectomy: a systematic review and meta-analysis of randomised controlled trials. Transl Gastroenterol Hepatol 2023; 8:37. [PMID: 38021359 PMCID: PMC10643220 DOI: 10.21037/tgh-23-48] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Accepted: 10/07/2023] [Indexed: 12/01/2023] Open
Abstract
Background Laparoscopic cholecystectomy (LC) in patients admitted with acute cholecystitis is considered the preferred, feasible and safe mode of managing gallstone disease. The objective of this study is to evaluate the role of single-dose pre-operative prophylactic antibiotics in patients undergoing emergency LC for mild to moderate acute cholecystitis. Methods All randomized control trials (RCTs) reporting the use of single-dose pre-operative prophylactic antibiotics in patients undergoing acute cholecystectomy were retrieved from the search of standard medical electronic databases and analysis was conducted by using the principles of meta-analysis on the statistical software RevMan version 5. Results Standard medical databases search produced only 3 RCTs on 781 patients undergoing acute cholecystectomy. There were 384 patients in single dose pre-operative antibiotics group whereas 397 patients were recruited in the no-antibiotics group. In the random effects model analysis, the use of single-dose preoperative prophylactic antibiotics in patients undergoing acute cholecystectomy for mild to moderate cholecystitis failed to demonstrate any extra advantage of reducing the risk of [risk ratio (RR) =0.69; 95% confidence interval (CI): 0.46-1.03; Z=1.80; P=0.07] infective complications. There was no heterogeneity [Tau2 =0; Chi2 =1.74, df =2 (P=0.42; I2=0%)] among included studies. Conclusions A preoperative single dose of prophylactic antibiotics in patients undergoing acute LC for mild to moderate acute cholecystitis does not offer extra benefits to reduce infective complications.
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Affiliation(s)
- Anurag Singh
- Department of Gastrointestinal Surgery, Royal Sussex County Hospital Brighton, Brighton, UK
| | - Mandeep Kaur
- Department of Gastrointestinal Surgery, Royal Sussex County Hospital Brighton, Brighton, UK
| | - Christie Swaminathan
- Department of Gastrointestinal Surgery, Royal Sussex County Hospital Brighton, Brighton, UK
| | - Atreya Subramanian
- Department of Gastrointestinal Surgery, Royal Sussex County Hospital Brighton, Brighton, UK
| | - Krishna K Singh
- Department of Gastrointestinal Surgery, Royal Sussex County Hospital Brighton, Brighton, UK
| | - Muhammad S Sajid
- Department of Gastrointestinal Surgery, Royal Sussex County Hospital Brighton, Brighton, UK
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Nikfarjam S, Singh KK. DNA damage response signaling: A common link between cancer and cardiovascular diseases. Cancer Med 2023; 12:4380-4404. [PMID: 36156462 PMCID: PMC9972122 DOI: 10.1002/cam4.5274] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 07/10/2022] [Accepted: 07/19/2022] [Indexed: 11/10/2022] Open
Abstract
DNA damage response (DDR) signaling ensures genomic and proteomic homeostasis to maintain a healthy genome. Dysregulation either in the form of down- or upregulation in the DDR pathways correlates with various pathophysiological states, including cancer and cardiovascular diseases (CVDs). Impaired DDR is studied as a signature mechanism for cancer; however, it also plays a role in ischemia-reperfusion injury (IRI), inflammation, cardiovascular function, and aging, demonstrating a complex and intriguing relationship between cancer and pathophysiology of CVDs. Accordingly, there are increasing number of reports indicating higher incidences of CVDs in cancer patients. In the present review, we thoroughly discuss (1) different DDR pathways, (2) the functional cross talk among different DDR mechanisms, (3) the role of DDR in cancer, (4) the commonalities and differences of DDR between cancer and CVDs, (5) the role of DDR in pathophysiology of CVDs, (6) interventional strategies for targeting genomic instability in CVDs, and (7) future perspective.
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Affiliation(s)
- Sepideh Nikfarjam
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, Canada.,Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, Canada
| | - Krishna K Singh
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, Canada.,Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, Canada
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Nguyen HC, Bu S, Nikfarjam S, Rasheed B, Michels DCR, Singh A, Singh S, Marszal C, McGuire JJ, Feng Q, Frisbee JC, Qadura M, Singh KK. Loss of fatty acid binding protein 3 ameliorates lipopolysaccharide-induced inflammation and endothelial dysfunction. J Biol Chem 2023; 299:102921. [PMID: 36681124 PMCID: PMC9988587 DOI: 10.1016/j.jbc.2023.102921] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 12/03/2022] [Accepted: 12/09/2022] [Indexed: 01/20/2023] Open
Abstract
Circulating fatty acid-binding protein 3 (FABP3) is an effective biomarker of myocardial injury and peripheral artery disease (PAD). The endothelium, which forms the inner most layer of every blood vessel, is exposed to higher levels of FABP3 in PAD or following myocardial injury, but the pathophysiological role of endothelial FABP3, the effect of FABP3 exposure on endothelial cells, and related mechanisms are unknown. Here, we aimed to evaluate the pathophysiological role of endothelial FABP3 and related mechanisms in vitro. Our molecular and functional in vitro analyses show that (1) FABP3 is basally expressed in endothelial cells; (2) inflammatory stress in the form of lipopolysaccharide (LPS) upregulated endothelial FABP3 expression; (3) loss of endogenous FABP3 protected endothelial cells against LPS-induced endothelial dysfunction; however, exogenous FABP3 exposure exacerbated LPS-induced inflammation; (4) loss of endogenous FABP3 protected against LPS-induced endothelial dysfunction by promoting cell survival and anti-inflammatory and pro-angiogenic signaling pathways. Together, these findings suggest that gain-of endothelial FABP3 exacerbates, whereas loss-of endothelial FABP3 inhibits LPS-induced endothelial dysfunction by promoting cell survival and anti-inflammatory and pro-angiogenic signaling. We propose that an increased circulating FABP3 in myocardial injury or PAD patients may be detrimental to endothelial function, and therefore, therapies aimed at inhibiting FABP3 may improve endothelial function in diseased states.
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Affiliation(s)
- Hien C Nguyen
- Department of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada; Department of Anatomy and Cell Biology, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Shuhan Bu
- Department of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Sepideh Nikfarjam
- Department of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada; Department of Anatomy and Cell Biology, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Berk Rasheed
- Department of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada; Department of Anatomy and Cell Biology, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - David C R Michels
- Department of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Aman Singh
- Department of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Shweta Singh
- Department of Applied Science, Fanshawe College, London, Ontario, Canada
| | - Caroline Marszal
- Department of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - John J McGuire
- Department of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Qingping Feng
- Physiology and Pharmacology, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Jefferson C Frisbee
- Department of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Mohammad Qadura
- Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
| | - Krishna K Singh
- Department of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada; Department of Anatomy and Cell Biology, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada.
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Zamzam A, Syed MH, Rotstein OD, Eikelboom J, Klein DJ, Singh KK, Abdin R, Qadura M. Validating fatty acid binding protein 3 as a diagnostic and prognostic biomarker for peripheral arterial disease: A three-year prospective follow-up study. EClinicalMedicine 2023; 55:101766. [PMID: 36531981 PMCID: PMC9755058 DOI: 10.1016/j.eclinm.2022.101766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 11/14/2022] [Accepted: 11/15/2022] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Patients with peripheral arterial disease (PAD) often remain undiagnosed and therefore suboptimally managed. Here, we investigated the diagnostic and prognostic potential of fatty acid binding protein 3 (FABP3) in patients with PAD. METHODS In the discovery phase, 374 PAD and 184 non-PAD patients were recruited from vascular surgery ambulatory clinics at St. Michael's Hospital (Toronto, Ontario, Canada) between October 4, 2017 to October 29, 2018. The diagnostic ability of baseline FABP3 level was investigated through receiver operator characteristic (ROC) curves to determine two cutoff points: 1) an exclusionary "rule out" cutoff point, and 2) a confirmatory "rule in" cutoff point. Next, these cutoff points were confirmed in the external validation phase using a separate cohort of 312 patients (180 PAD and 132 non-PAD) recruited from ambulatory vascular surgery clinics at St. Michael's Hospital (Canada) between November 6, 2018-July 30, 2019. Cox regression analyses were used to explore the independent association between FABP3 and major adverse limb events (MALE - defined as need for arterial revascularization or major amputation) and decrease in ankle-brachial index (ABI -defined as drop ≥0.15) during 3 years of follow-up. FINDINGS In the discovery phase, FABP3 levels were significantly elevated in patients with PAD compared to non-PAD patients. ROC analysis demonstrated that FABP3 had an AUC of 0.83 (95% CI: 0.81-0.86, p-value < 0.001). FABP3 exclusionary cutoff was <1.55 ng/ml (sensitivity = 96%; specificity = 40%), whereas FABP3 confirmatory cutoff was >3.55 ng/ml (sensitivity = 43%; specificity = 95%) - values that were confirmed in the external validation phase. Cox regression analysis demonstrated FABP3 to be an independent predictor of increase in MALE [HR = 1.14 (1.03-1.29); p-value = 0.010] and worsening PAD status (drop in ABI >0.15 [HR = 1.11 (1.02-1.19); p-value = 0.009]). INTERPRETATION Our findings suggested that FABP3 levels can be used as both a diagnostic and prognostic biomarker for PAD, and may facilitate risk stratification in select individuals for purposes of vascular evaluation or intensive medical management. FUNDING Funding for this study was provided by the Bill and Vicky Blair Foundation.
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Affiliation(s)
- Abdelrahman Zamzam
- Division of Vascular Surgery, St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada
| | - Muzammil H. Syed
- Division of Vascular Surgery, St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada
| | - Ori D. Rotstein
- Department of Surgery, University of Toronto, Toronto, ON, M5S 1A1, Canada
- Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada
| | - John Eikelboom
- Population Health Research Institute, McMaster University, Hamilton, Ontario, Canada
- Department of Medicine, McMaster University, Hamilton, ON, L8S 4K1, Canada
| | - David J. Klein
- Dalla Lana School of Public Health, University of Toronto, Toronto, ON M5T 3M7, Canada
- Department of Critical Care, St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada
| | - Krishna K. Singh
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London ON, N6A 5C1, Canada
| | - Rawand Abdin
- Department of Medicine, McMaster University, Hamilton, ON, L8S 4K1, Canada
| | - Mohammad Qadura
- Division of Vascular Surgery, St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada
- Department of Surgery, University of Toronto, Toronto, ON, M5S 1A1, Canada
- Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada
- Corresponding author. St. Michael's Hospital, 30 Bond St, 7-076 Bond Wing, Toronto, Ontario, M5B 1W8, Canada.
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10
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Wang AN, Carlos J, Singh KK, Fraser GM, McGuire JJ. Endothelium dysfunction in hind limb arteries of male Zucker Diabetic-Sprague Dawley rats. Biochem Pharmacol 2022; 206:115319. [PMID: 36279920 DOI: 10.1016/j.bcp.2022.115319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 10/14/2022] [Accepted: 10/17/2022] [Indexed: 12/14/2022]
Abstract
Endothelium dysfunction produces peripheral vascular disease comorbidities in type 2 diabetes, including hypertension, and critical limb ischemia. In this study we aimed to test endothelial dysfunction, the vasodilator effects of a proteinase-activated receptor 2 (PAR2) agonist (2fLIGRLO), and thromboxane A2 synthase inhibitor (ozagrel) on PAR2 vasodilation in hind limb arteries ex vivo, using Zucker Diabetic-Sprague Dawley (ZDSD) rats, a model of type 2 diabetes. Male Sprague Dawley rats (SD) and ZDSD were fed a high-fat content 'Western diet' from 16 to 20 weeks of age (wks) then fed a standard laboratory diet. We identified diabetic ZDSD rats by two consecutive blood glucose measurements > 12.5 mM, based on weekly monitoring. We used acetylcholine, 2fLIGRLO, and nitroprusside with wire-myograph methods to compare relaxations of femoral, and saphenous arteries from diabetic ZDSD (21-23 wks) to age-matched normoglycemic SD. All arteries showed evidence of endothelium dysfunction using acetylcholine (reduced maximum relaxations, reduced sensitivity), and higher sensitivities to 2fLIGRLO, and nitroprusside in ZDSD vs SD. Ozagrel treatment of ZDSD distal segments, and end-branches of saphenous arteries decreased their sensitivities to 2fLIGRLO. We tested aortas for altered expression of endothelium-specific gene targets using PCR array and qPCR. PAR2, and placental growth factor gene transcripts were 1.5, and 4-times higher in ZDSD than SD aortas. Hind limb arteries of ZDSD exhibit endothelium dysfunction having less GPCR agonist induced vasodilation by endothelial NO-release. Different expression of several endothelial genes in ZDSD vs SD aortas, including PAR2, suggests altered inflammatory, and angiogenesis signaling pathways in the endothelium of ZDSD.
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Affiliation(s)
- Andrea N Wang
- Department of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Joselia Carlos
- Department of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Krishna K Singh
- Department of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Graham M Fraser
- Division of BioMedical Sciences, Faculty of Medicine, Memorial University, St. John's, Newfoundland and Labrador, Canada
| | - John J McGuire
- Department of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada; Department of Physiology and Pharmacology, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada.
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11
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Carroll SP, Phyo S, Oldam J, Singh KK, Ceisel A, Semel J, Prosser B, Agnetti G. Early desmin cytoskeleton remodeling in experimental cardiac hypertrophy. J Mol Cell Cardiol 2022. [DOI: 10.1016/j.yjmcc.2022.08.157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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12
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Bu S, Nguyen HC, Nikfarjam S, Michels DCR, Rasheed B, Maheshkumar S, Singh S, Singh KK. Endothelial cell-specific loss of eNOS differentially affects endothelial function. PLoS One 2022; 17:e0274487. [PMID: 36149900 PMCID: PMC9506615 DOI: 10.1371/journal.pone.0274487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Accepted: 08/29/2022] [Indexed: 12/01/2022] Open
Abstract
The endothelium maintains and regulates vascular homeostasis mainly by balancing interplay between vasorelaxation and vasoconstriction via regulating Nitric Oxide (NO) availability. Endothelial nitric oxide synthase (eNOS) is one of three NOS isoforms that catalyses the synthesis of NO to regulate endothelial function. However, eNOS’s role in the regulation of endothelial function, such as cell proliferation and migration remain unclear. To gain a better understanding, we genetically knocked down eNOS in cultured endothelial cells using sieNOS and evaluated cell proliferation, migration and also tube forming potential in vitro. To our surprise, loss of eNOS significantly induced endothelial cell proliferation, which was associated with significant downregulation of both cell cycle inhibitor p21 and cell proliferation antigen Ki-67. Knockdown of eNOS induced cell migration but inhibited formation of tube-like structures in vitro. Mechanistically, loss of eNOS was associated with activation of MAPK/ERK and inhibition of PI3-K/AKT signaling pathway. On the contrary, pharmacologic inhibition of eNOS by inhibitors L-NAME or L-NMMA, inhibited cell proliferation. Genetic and pharmacologic inhibition of eNOS, both promoted endothelial cell migration but inhibited tube-forming potential. Our findings confirm that eNOS regulate endothelial function by inversely controlling endothelial cell proliferation and migration, and by directly regulating its tube-forming potential. Differential results obtained following pharmacologic versus genetic inhibition of eNOS indicates a more complex mechanism behind eNOS regulation and activity in endothelial cells, warranting further investigation.
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Affiliation(s)
- Shuhan Bu
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | - Hien C. Nguyen
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
- Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | - Sepideh Nikfarjam
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
- Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | - David C. R. Michels
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | - Berk Rasheed
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
- Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | - Sauraish Maheshkumar
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | - Shweta Singh
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | - Krishna K. Singh
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
- Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
- * E-mail:
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13
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Mauro AN, Turgeon PJ, Gupta S, Brand-Arzamendi K, Chen H, Malone JH, Ng R, Ho K, Dubinsky M, Di Ciano-Oliveira C, Spring C, Plant P, Leong-Poi H, Marshall JC, Marsden PA, Connelly KA, Singh KK. Automated in vivo compound screening with zebrafish and the discovery and validation of PD 81,723 as a novel angiogenesis inhibitor. Sci Rep 2022; 12:14537. [PMID: 36008455 PMCID: PMC9411172 DOI: 10.1038/s41598-022-18230-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 08/08/2022] [Indexed: 11/25/2022] Open
Abstract
Angiogenesis is a critical process in tumor progression. Inhibition of angiogenesis by blocking VEGF signaling can impair existing tumor vessels and halt tumor progression. However, the benefits are transient, and most patients who initially respond to these therapies develop resistance. Accordingly, there is a need for new anti-angiogenesis therapeutics to delay the processes of resistance or eliminate the resistive effects entirely. This manuscript presents the results of a screen of the National Institutes of Health Clinical Collections Libraries I & II (NIHCCLI&II) for novel angiogenesis inhibitors. The 727 compounds of the NIHCCLI&II library were screened with a high-throughput drug discovery platform (HTP) developed previously with angiogenesis-specific protocols utilizing zebrafish. The screen resulted in 14 hit compounds that were subsequently narrowed down to one, with PD 81,723 chosen as the lead compound. PD 81,723 was validated as an inhibitor of angiogenesis in vivo in zebrafish and in vitro in human umbilical vein endothelial cells (HUVECs). Zebrafish exposed to PD 81,723 exhibited several signs of a diminished endothelial network due to the inhibition of angiogenesis. Immunochemical analysis did not reveal any significant apoptotic or mitotic activity in the zebrafish. Assays with cultured HUVECs elucidated the ability of PD 81,723 to inhibit capillary tube formation, migration, and proliferation of endothelial cells. In addition, PD 81,723 did not induce apoptosis while significantly down regulating p21, AKT, VEGFR-2, p-VEGFR-2, eNOS, and p-eNOS, with no notable change in endogenous VEGF-A in cultured HUVECs.
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Affiliation(s)
- Antonio N Mauro
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada. .,Institute of Medical Science, University of Toronto, Toronto, M5S 1A8, Canada. .,Cardiovascular Sciences Collaborative Specialization, University of Toronto, Toronto, M5T 1W7, Canada.
| | - Paul J Turgeon
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada.,Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, M5S 1A8, Canada
| | - Sahil Gupta
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada.,Institute of Medical Science, University of Toronto, Toronto, M5S 1A8, Canada.,Faculty of Medicine, School of Medicine, The University of Queensland, Herston, QLD, 4006, Australia
| | - Koroboshka Brand-Arzamendi
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada
| | - Hao Chen
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada.,Institute of Medical Science, University of Toronto, Toronto, M5S 1A8, Canada.,Cardiovascular Sciences Collaborative Specialization, University of Toronto, Toronto, M5T 1W7, Canada
| | - Jeanie H Malone
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada
| | - Robin Ng
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada
| | - Kevin Ho
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada
| | - Michelle Dubinsky
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada.,Institute of Medical Science, University of Toronto, Toronto, M5S 1A8, Canada
| | - Caterina Di Ciano-Oliveira
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada
| | - Christopher Spring
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada
| | - Pamela Plant
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada
| | - Howard Leong-Poi
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada.,Institute of Medical Science, University of Toronto, Toronto, M5S 1A8, Canada.,Cardiovascular Sciences Collaborative Specialization, University of Toronto, Toronto, M5T 1W7, Canada
| | - John C Marshall
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada.,Institute of Medical Science, University of Toronto, Toronto, M5S 1A8, Canada.,Departments of Surgery and Critical Care Medicine, St. Michael's Hospital, University of Toronto, Toronto, M5B 1W8, Canada
| | - Philip A Marsden
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada.,Institute of Medical Science, University of Toronto, Toronto, M5S 1A8, Canada.,Cardiovascular Sciences Collaborative Specialization, University of Toronto, Toronto, M5T 1W7, Canada.,Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, M5S 1A8, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, M5G 1L7, Canada.,Department of Medicine, University of Toronto, Toronto, M5S 3H2, Canada
| | - Kim A Connelly
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada. .,Institute of Medical Science, University of Toronto, Toronto, M5S 1A8, Canada. .,Cardiovascular Sciences Collaborative Specialization, University of Toronto, Toronto, M5T 1W7, Canada.
| | - Krishna K Singh
- Keenan Research Center, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, M5B 1T8, Canada. .,Institute of Medical Science, University of Toronto, Toronto, M5S 1A8, Canada. .,Department of Pharmacology and Toxicology, University of Toronto, Toronto, M5S 1A8, Canada. .,Department of Surgery, University of Toronto, Toronto, M5T 1P5, Canada. .,Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, N6A 5C1, Canada.
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14
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Nour HM, Peristeri DV, Shafique S, Khan PM, Singh KK, Sajid MMS. EP-245 A snapshot review of the use of prophylactic antibiotics for emergency gastrointestinal surgeries: a tertiary care centre experience. Br J Surg 2022. [DOI: 10.1093/bjs/znac245.064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Abstract
Aim
The administration of recommended prophylactic antibiotics on time for emergency gastrointestinal surgery (GIS) is effective in reducing surgical site infections (SSI) and expediting post-operative recovery. This audit aims to assess the optimum use of prophylactic antibiotics in patients undergoing emergency GIS.
Methods
The data of all patients undergoing emergency GIS over a 1-month period was reviewed according to UH Sussex NHS trust (microguide) guidelines. The data was extracted, transferred and analysed using Microsoft Excel.
Results
Forty-one patients underwent emergency GIS during the study period. Emergency GIS procedures included laparoscopic appendicectomy (n=20), open colorectal resections (n=5), laparoscopic colorectal resections (n=3), perforated duodenal ulcer repair (n=2), inguinal hernia repair (n=2), diagnostic laparoscopy (n=2), defunctioning ileostomy (n=2) and other (n=5). Recommended antibiotics were administered in 17 (41.5%) patients and 29 (70.8%) patients were administered antibiotics at the correct time. Surgical site infections (SSI) were seen in 6 (14.5%) patients, of which 2 (11%) patients were in the recommended-antibiotics group and 4 (16.5%) in the non-recommended antibiotics group (p= 0.05). Two patients (2/29; 6.8%) contracted SSI in the group which received antibiotics on time. The major factor behind using non-recommended antibiotics and not administering antibiotics at the recommended time was the continuation of antibiotics commenced at the time of admission.
Conclusion
A significantly higher proportion of patients undergoing emergency GIS were not administered the recommended antibiotics. Moreover, almost one third of patients were not administered antibiotics on time. Use of non-recommended antibiotics results in higher incidence of SSI in patients undergoing emergency GIS.
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15
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Kumar S, Singh KK. Rain garden infiltration rate modeling using gradient boosting machine and deep learning techniques. Water Sci Technol 2021; 84:2366-2379. [PMID: 34810317 DOI: 10.2166/wst.2021.444] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Rain garden is effective in reducing storm water runoff, whose efficiency depends upon several parameters such as soil type, vegetation and meteorological factors. Evaluation of rain gardens has been done by various researchers. However, knowledge for sound design of rain gardens is still very limited, particularly the accurate modeling of infiltration rate and how much it differs from infiltration of natural ground surface. The present study uses experimentally observed infiltration rate of rain gardens with different types of vegetation (grass, candytuft, marigold and daisy with different plant densities) and flow conditions. After that, modeling has been done by the popular infiltration model i.e. Philip's model (which is valid for natural ground surface) and soft computing tools viz. Gradient Boosting Machine (GBM) and Deep Learning (DL). Results suggest a promising performance (in terms of CC, RMSE, MAE, MSE and NSE) by GBM and DL in comparison to the relation proposed by Philip's model (1957). Most of the values predicted by both GBM and DL are within scatter limits of ±5%, whereas the values by Philips model are within the range of ±25% error lines and even outside. GBM performs better than DL as the values of the correlation coefficients and Nash-Sutcliffe model efficiency (NSE) coefficient are the highest and the root mean square error is the lowest. The results of the study will be useful in selection of plant type and its density in the rain garden of the urban area.
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Affiliation(s)
- Sandeep Kumar
- Department of Civil Engineering, NIT Kurukshetra, Kurukshetra, India E-mail: ;
| | - K K Singh
- Department of Civil Engineering, NIT Kurukshetra, Kurukshetra, India E-mail: ;
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16
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Bu S, Singh KK. Epigenetic Regulation of Autophagy in Cardiovascular Pathobiology. Int J Mol Sci 2021; 22:ijms22126544. [PMID: 34207151 PMCID: PMC8235464 DOI: 10.3390/ijms22126544] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 06/12/2021] [Accepted: 06/16/2021] [Indexed: 02/07/2023] Open
Abstract
Cardiovascular diseases (CVDs) are the number one cause of debilitation and mortality worldwide, with a need for cost-effective therapeutics. Autophagy is a highly conserved catabolic recycling pathway triggered by various intra- or extracellular stimuli to play an essential role in development and pathologies, including CVDs. Accordingly, there is great interest in identifying mechanisms that govern autophagic regulation. Autophagic regulation is very complex and multifactorial that includes epigenetic pathways, such as histone modifications to regulate autophagy-related gene expression, decapping-associated mRNA degradation, microRNAs, and long non-coding RNAs; pathways are also known to play roles in CVDs. Molecular understanding of epigenetic-based pathways involved in autophagy and CVDs not only will enhance the understanding of CVDs, but may also provide novel therapeutic targets and biomarkers for CVDs.
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Affiliation(s)
| | - Krishna K. Singh
- Correspondence: ; Tel.: +1-519-661-2111 (ext. 80542) (Office) or (ext. 85683) (Lab)
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17
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Affiliation(s)
| | - Mohammad Masdari
- Computer Engineering Department, Urmia Branch Islamic Azad University Urmia Iran
| | - Gaurav Dhiman
- Department of Computer Science Government Bikram College of Commerce Patiala India
| | - Vahid Hosseini
- Computer Engineering Department Payame Noor University Urmia Iran
| | - Krishna K. Singh
- Faculty of Engineering & Technology Jain (Deemed‐to‐be University) Bengaluru India
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18
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Zamzam A, Syed MH, Harlock J, Eikelboom J, Singh KK, Abdin R, Qadura M. Urinary fatty acid binding protein 3 (uFABP3) is a potential biomarker for peripheral arterial disease. Sci Rep 2021; 11:11061. [PMID: 34040076 PMCID: PMC8155078 DOI: 10.1038/s41598-021-90395-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 05/10/2021] [Indexed: 12/24/2022] Open
Abstract
Plasma levels of fatty acid binding protein 3 (pFABP3) are elevated in patients with peripheral artery disease (PAD). Since the kidney filters FABP3 from circulation, we investigated whether urinary fatty acid binding protein 3 (uFABP3) is associated with PAD, and also explored its potential as a diagnostic biomarker for this disease state. A total of 130 patients were recruited from outpatient clinics at St. Michael's Hospital, comprising of 65 patients with PAD and 65 patients without PAD (non-PAD). Levels of uFABP3 normalized for urine creatinine (uFABP3/uCr) were 1.7-folds higher in patients with PAD [median (IQR) 4.41 (2.79-8.08)] compared with non-PAD controls [median (IQR) 2.49 (1.78-3.12), p-value = 0.001]. Subgroup analysis demonstrated no significant effect of cardiovascular risk factors (age, sex, hypertension, hypercholesteremia, diabetes and smoking) on uFABP3/uCr in both PAD and non-PAD patients. Spearmen correlation studies demonstrated a significant negative correlation between uFABP3/uCr and ABI (ρ = - 0.436; p-value = 0.001). Regression analysis demonstrated that uFABP3/Cr levels were associated with PAD independently of age, sex, hypercholesterolemia, smoking, prior history of coronary arterial disease and Estimated Glomerular Filtration rate (eGFR) [odds ratio: 2.34 (95% confidence interval: 1.47-3.75) p-value < 0.001]. Lastly, receiver operator curve (ROC) analysis demonstrated unadjusted area under the curve (AUC) for uFABP3/Cr of 0.79, which improved to 0.86 after adjusting for eGFR, age, hypercholesteremia, smoking and diabetes. In conclusion, our results demonstrate a strong association between uFABP3/Cr and PAD and suggest the potential of uFABP3/Cr in identifying patients with PAD.
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Affiliation(s)
- Abdelrahman Zamzam
- Division of Vascular Surgery, St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada
| | - Muzammil H Syed
- Division of Vascular Surgery, St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada
| | - John Harlock
- Department of Surgery, Hamilton General Hospital, Hamilton, Canada
| | - John Eikelboom
- Population Health Research Institute, McMaster University, Hamilton, ON, Canada
- Department of Medicine, McMaster University, Hamilton, ON, L8S 4K1, Canada
| | - Krishna K Singh
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada
| | - Rawand Abdin
- Department of Medicine, McMaster University, Hamilton, ON, L8S 4K1, Canada
| | - Mohammad Qadura
- Division of Vascular Surgery, St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada.
- Department of Surgery, University of Toronto, Toronto, ON, M5S 1A1, Canada.
- Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada.
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19
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Halvorson BD, McGuire JJ, Singh KK, Butcher JT, Lombard JH, Chantler PD, Frisbee JC. Can Myogenic Tone Protect Endothelial Function? Integrating Myogenic Activation and Dilator Reactivity for Cerebral Resistance Arteries in Metabolic Disease. J Vasc Res 2021; 58:286-300. [PMID: 33971663 PMCID: PMC8478702 DOI: 10.1159/000516088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Accepted: 03/22/2021] [Indexed: 11/19/2022] Open
Abstract
The obese Zucker rat (OZR) manifests multiple risk factors for impaired cerebrovascular function, including hypertension and insulin resistance although how they combine to produce integrated vascular function is unclear. As studies have suggested that myogenic activation (MA) severity for middle cerebral arteries (MCAs) may be proportional to hypertension severity, we hypothesized that MA will negatively correlate with dilator reactivity in OZR. MA of MCA from OZR was divided into low, medium, and high based on the slope of MA, while MCA reactivity and vascular metabolite bioavailability were assessed in all groups. Endothelium-dependent dilation of MCA in OZR was attenuated and correlated with the MA slope. Treatment of OZR MCA with TEMPOL (antioxidant) improved dilation in low or medium MA groups, but had less impact on high MA. Alternatively, treatment with gadolinium to normalize MA in OZR had reduced impact on dilator reactivity in MCA from low and medium MA groups, but improved responses in the high group. Treatment with both agents resulted in dilator responses that were comparable across all groups. These results suggest that, under conditions with stronger MA, endothelial function may receive some protection despite the environment, potentially from the ability of MCA to reduce wall tension despite increased pressure.
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MESH Headings
- Animals
- Antioxidants/pharmacology
- Cerebrovascular Circulation/drug effects
- Disease Models, Animal
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/metabolism
- Endothelium, Vascular/physiopathology
- Male
- Metabolic Syndrome/metabolism
- Metabolic Syndrome/physiopathology
- Middle Cerebral Artery/drug effects
- Middle Cerebral Artery/metabolism
- Middle Cerebral Artery/physiopathology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/physiopathology
- Rats, Zucker
- Vascular Resistance/drug effects
- Vasodilation/drug effects
- Vasodilator Agents/pharmacology
- Rats
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Affiliation(s)
- Brayden D. Halvorson
- Departments of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario
| | - John J. McGuire
- Departments of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario
| | - Krishna K. Singh
- Departments of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario
| | - Joshua T. Butcher
- Department of Physiological Sciences, Oklahoma State University, Stillwater, Oklahoma
| | - Julian H. Lombard
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Paul D. Chantler
- Division of Exercise Physiology, West Virginia University Health Sciences Center, Morgantown, West Virginia
| | - Jefferson C. Frisbee
- Departments of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario
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20
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Pal AK, Dwivedi AD, Kumar A, Pahwa HS, Sonkar AA, Singh KK. Comment to "Endoscopic retromuscular technique (eTEP) vs conventional laparoscopic ventral or incisional hernia repair with defect closure (IPOM +) for midline hernias: a case-control study". Hernia 2021; 25:1105-1106. [PMID: 33866451 DOI: 10.1007/s10029-021-02412-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 04/08/2021] [Indexed: 11/26/2022]
Affiliation(s)
- A K Pal
- Department of Surgery, King George's Medical University, Lucknow, UP, India.
| | - A D Dwivedi
- Department of Surgery, King George's Medical University, Lucknow, UP, India
| | - A Kumar
- Department of Surgery, King George's Medical University, Lucknow, UP, India
| | - H S Pahwa
- Department of Surgery, King George's Medical University, Lucknow, UP, India
| | - A A Sonkar
- Department of Surgery, King George's Medical University, Lucknow, UP, India
| | - K K Singh
- Department of Surgery, King George's Medical University, Lucknow, UP, India
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21
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Negi HS, Kumar A, Kanda N, Thakur NK, Singh KK. Status of glaciers and climate change of East Karakoram in early twenty-first century. Sci Total Environ 2021; 753:141914. [PMID: 32906043 DOI: 10.1016/j.scitotenv.2020.141914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 08/13/2020] [Accepted: 08/21/2020] [Indexed: 06/11/2023]
Abstract
This study aims to assess the glaciers change status in Shyok basin, East Karakoram in terms of area and mass balance, and to ascertain if glaciers in this part of Karakoram also display similar anomaly like central or western counterparts. The spatio-temporal monitoring of glaciers during the time frame of 24 years (1990/2000/2014) suggests major percentage of stable glaciers and insignificant retreat in the total glaciated area. The percentage of retreating glaciers has increased after year 2000. Area change analysis of glaciers having size >1 km2 (569 glaciers) suggests the number of fluctuated glaciers have substantially increased i.e. overall 56% glaciers remained stable, 35% retreated and 9% advanced during 1990-2014. The geodetic based findings using SRTM-C (2000) and Cartosat-1 (2010/2011/2014) stereo-imageries for 201 glaciers suggest the mass loss at the rate of -0.10 ± 0.07 m w.e. a-1. To better apprehend the status of glaciers changes in the region, climatic studies using in-situ observations as well as reanalysis dataset (ERA-I) were also undertaken of past 30 years. Therefore, this study is also a maiden attempt to ascertain if along with Karakoram anomaly, a climatic anomaly exists in the Eastern parts of Karakoram or not. A long term field collected snow-meteorological data of East Karakoram region suggests overall warming trend in annual temperature and no trend for snowfall during 1985-2015. The statistically significant increased rates of warming and decreased snowfall after year 2000 support the spatial variations in glaciers of East Karakoram and marginal mass loss. The observations of the marginal mass loss along with warming temperatures indicate that no Karakoram or climatic anomaly is existent over the East Karakoram region. Our study further refutes the prevalence of the elevation-dependent warming (EDW) over East Karakoram region vis-à-vis North-West Himalayan ranges. The impact of hiatus in global warming was also not observed over studied region.
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Affiliation(s)
- H S Negi
- Snow and Avalanche Study Establishment, Him-Parisar, Sector-37A, Chandigarh 160036, India.
| | - Anant Kumar
- Snow and Avalanche Study Establishment, Him-Parisar, Sector-37A, Chandigarh 160036, India
| | - Neha Kanda
- Snow and Avalanche Study Establishment, Him-Parisar, Sector-37A, Chandigarh 160036, India
| | - N K Thakur
- Snow and Avalanche Study Establishment, Him-Parisar, Sector-37A, Chandigarh 160036, India
| | - K K Singh
- Snow and Avalanche Study Establishment, Him-Parisar, Sector-37A, Chandigarh 160036, India
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Singh S, Nguyen HC, Ehsan M, Michels DCR, Singh P, Qadura M, Singh KK. Pravastatin-induced changes in expression of long non-coding and coding RNAs in endothelial cells. Physiol Rep 2021; 9:e14661. [PMID: 33369888 PMCID: PMC7769171 DOI: 10.14814/phy2.14661] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 11/02/2020] [Accepted: 11/06/2020] [Indexed: 11/24/2022] Open
Abstract
OBJECTIVE Atherosclerosis is the main cause of the cardiovascular disease (CVD). Elevated blood cholesterol and inflammation of the endothelium are two major mechanisms contributing to the establishment of atherosclerotic plaques. Statins, such as pravastatin, are blood-cholesterol lowering drugs commonly prescribed for patients with or at risk for CVDs. In addition to lowering blood cholesterols, statins have recently been shown to improve endothelial function in both hyper- and normocholesterolemic patients with atherosclerosis. To understand the molecular mechanisms underlying the endothelial function improvement by statins, we assessed the RNA profile of pravastatin-treated endothelial cells, particularly their mRNAs and long non-coding RNAs (lncRNAs). METHODS Human umbilical vein endothelial cells (HUVECs) treated with pravastatin (10 µM) for 24 hr were profiled for lncRNAs and mRNAs using the Arraystar Human lncRNA Expression Microarray V3.0. RESULTS Of the 30,584 different lncRNAs screened, 95 were significantly upregulated, while 86 were downregulated in HUVECs responding to pravastatin. LINC00281 and BC045663 were the most upregulated (~8-fold) and downregulated (~3.5-fold) lncRNAs, respectively. Of the 26,106 different mRNAs screened in the pravastatin-treated HUVEC samples, 190 were significantly upregulated, while 90 were downregulated. Assigning the differentially expressed genes by bioinformatics into functional groups revealed their molecular signaling involvement in the following physiological processes: osteoclast differentiation, Rap1 signaling pathway, hematopoiesis, immunity, and neurotrophin signaling pathway. CONCLUSIONS This is the first lncRNA and mRNA expression profiling of pravastatin-mediated changes in human endothelial cells. Our results reveal potential novel targets and mechanisms for pravastatin-mediated vascular protection in atherosclerosis.
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Affiliation(s)
- Shweta Singh
- Department of Chemical and Biochemical EngineeringSchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
| | - Hien C. Nguyen
- Department of Medical BiophysicsSchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
- Department of Anatomy and Cell BiologySchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
| | - Mehroz Ehsan
- Department of Medical BiophysicsSchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
- Schulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
| | - David C. R. Michels
- Department of Medical BiophysicsSchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
| | - Priyanka Singh
- Schulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
| | - Mohammad Qadura
- Vascular SurgeryKeenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael’s HospitalTorontoONCanada
- Institute of Medical ScienceUniversity of TorontoTorontoONCanada
| | - Krishna K. Singh
- Department of Medical BiophysicsSchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
- Department of Anatomy and Cell BiologySchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
- Institute of Medical ScienceUniversity of TorontoTorontoONCanada
- Pharmacology and ToxicologyUniversity of TorontoTorontoONCanada
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Swain B, Singh KK, Pabby AK. Computational fluid dynamics modeling of uranium(VI) transport through hollow fiber supported liquid membrane. SEP SCI TECHNOL 2020. [DOI: 10.1080/01496395.2020.1852259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Biswajit Swain
- INRPC, Nuclear Recycle Board, BARC, Tarapur, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai, India
| | - K K Singh
- Chemical Engineering Division, BARC, Mumbai, Maharashtra, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai, India
| | - Anil Kumar Pabby
- TRP, Nuclear Recycle Board, BARC, Tarapur, Maharashtra, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai, India
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Nguyen HC, Qadura M, Singh KK. Role of the Fatty Acid Binding Proteins in Cardiovascular Diseases: A Systematic Review. J Clin Med 2020; 9:E3390. [PMID: 33105856 PMCID: PMC7690604 DOI: 10.3390/jcm9113390] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 10/19/2020] [Accepted: 10/19/2020] [Indexed: 02/06/2023] Open
Abstract
Cardiovascular diseases (CVD) remain a global pandemic and leading cause of deaths worldwide. While several guidelines have been developed to control the development of CVDs, its prevalence keeps on increasing until this day. Cardiovascular risk factors, such as reduced exercises and high fat or glucose diets, culminate in the development of the metabolic syndrome and eventually atherosclerosis, which is driven by high blood lipid and cholesterol levels, and by endothelial dysfunction. Late complications of atherosclerosis give rise to serious clinical cardiovascular manifestations such as myocardial infarction and hypertension. Therefore, endothelial functions and the lipid metabolism play critical roles in the pathogenesis of CVDs. Fatty acid-binding proteins are a family of intracellular proteins expressed in many cell types known mainly for their interaction with and trafficking of cellular lipids. The roles of a number of isoforms in this family have been implicated in lipid metabolic homeostasis, but their influence on endothelial function and vascular homeostasis remain largely unknown. This review's purpose is to update fundamentals about the connection between cardiovascular disease, metabolism, endothelial function, and mainly the roles of fatty acid-binding proteins.
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Affiliation(s)
- Hien C. Nguyen
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON N6A 5C1, Canada;
| | - Mohammad Qadura
- Vascular Surgery, Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada;
| | - Krishna K. Singh
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON N6A 5C1, Canada;
- Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON N6A 5C1, Canada
- Pharmacology and Toxicology, University of Toronto, Toronto, ON M5S 1A1, Canada
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Zamzam A, Syed MH, Greco E, Wheatcroft M, Jain S, Khan H, Singh KK, Forbes TL, Rotstein O, Abdin R, Qadura M. Fatty Acid Binding Protein 4-A Circulating Protein Associated with Peripheral Arterial Disease in Diabetic Patients. J Clin Med 2020; 9:jcm9092843. [PMID: 32887447 PMCID: PMC7564356 DOI: 10.3390/jcm9092843] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Revised: 08/18/2020] [Accepted: 08/20/2020] [Indexed: 01/01/2023] Open
Abstract
Diabetic patients with peripheral arterial disease (PAD) often suffer from poor clinical outcomes such as limb-loss. Fatty acid binding protein 4 (FABP4) is mainly expressed by adipocytes and is known to play a significant role in the development of atherosclerosis. In this study, we sought to investigate whether FABP4 is associated with PAD in patients with type 2 diabetes mellitus (DM). FABP4 plasma levels were studied in 119 diabetic patients with PAD (DM-PAD) and 49 diabetic patients without PAD (DM-noPAD) presenting to St. Michael’s Hospital between October 2017 and September 2018. Levels of FABP4 in DM-PAD patients (23.34 ± 15.27 ng/mL) were found to be over two-fold higher than the levels in DM-noPAD patients (10.3 ± 7.59 ng/mL). Regression analysis demonstrated a significant association between FABP4 levels and DM-PAD after adjusting for age, sex, prior history of coronary arterial disease and white blood cells count (OR, 2.77; 95% CI, 1.81–4.31; p-value = 0.001). Relative to DM-noPAD controls, plasma FABP4 levels in DM-PAD patients were noted to be inversely correlated with the ankle brachial index (ABI; r= −0.374, p-value < 0.001). The diagnostic ability of FABP4 was investigated using receiver operator curves (ROC) and area under the curve (AUC) analysis. FABP4 had an AUC of 0.79, which improved to 0.86 after adjusting for age, sex and prior history of coronary arterial disease. This raises a possibility of utilizing FABP4 as a biomarker for diagnosing PAD in diabetic patients.
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Affiliation(s)
- Abdelrahman Zamzam
- Division of Vascular Surgery, St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada; (A.Z.); (M.H.S.); (E.G.); (M.W.); (S.J.); (H.K.)
| | - Muzammil H. Syed
- Division of Vascular Surgery, St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada; (A.Z.); (M.H.S.); (E.G.); (M.W.); (S.J.); (H.K.)
| | - Elisa Greco
- Division of Vascular Surgery, St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada; (A.Z.); (M.H.S.); (E.G.); (M.W.); (S.J.); (H.K.)
- Department of Surgery, University of Toronto, Toronto, ON M5S 1A1, Canada; (T.L.F.); (O.R.)
| | - Mark Wheatcroft
- Division of Vascular Surgery, St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada; (A.Z.); (M.H.S.); (E.G.); (M.W.); (S.J.); (H.K.)
- Department of Surgery, University of Toronto, Toronto, ON M5S 1A1, Canada; (T.L.F.); (O.R.)
| | - Shubha Jain
- Division of Vascular Surgery, St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada; (A.Z.); (M.H.S.); (E.G.); (M.W.); (S.J.); (H.K.)
| | - Hamzah Khan
- Division of Vascular Surgery, St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada; (A.Z.); (M.H.S.); (E.G.); (M.W.); (S.J.); (H.K.)
| | - Krishna K. Singh
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON N6A 5C1, Canada;
| | - Thomas L. Forbes
- Department of Surgery, University of Toronto, Toronto, ON M5S 1A1, Canada; (T.L.F.); (O.R.)
- Division of Vascular Surgery, Peter Munk Cardiac Centre, University Health Network, University of Toronto, Toronto, ON M5G 2N2, Canada
| | - Ori Rotstein
- Department of Surgery, University of Toronto, Toronto, ON M5S 1A1, Canada; (T.L.F.); (O.R.)
- Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute of St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada
| | - Rawand Abdin
- Department of Medicine, McMaster University, Hamilton, ON L8S 4K1, Canada;
| | - Mohammad Qadura
- Department of Surgery, University of Toronto, Toronto, ON M5S 1A1, Canada; (T.L.F.); (O.R.)
- Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute of St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada
- Correspondence: ; Tel.: +1-416-864-5154
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Singh S, Nguyen H, Michels D, Bazinet H, Matkar PN, Liu Z, Esene L, Adam M, Bugyei‐Twum A, Mebrahtu E, Joseph J, Ehsan M, Chen HH, Qadura M, Singh KK. BReast CAncer susceptibility gene 2 deficiency exacerbates oxidized LDL-induced DNA damage and endothelial apoptosis. Physiol Rep 2020; 8:e14481. [PMID: 32638521 PMCID: PMC7340845 DOI: 10.14814/phy2.14481] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 03/18/2020] [Accepted: 05/15/2020] [Indexed: 12/24/2022] Open
Abstract
Mutations in the tumor suppressor gene BRCA2 (BReast CAncer susceptibility gene 2) predispose carriers to breast, ovarian, and other cancers. In response to DNA damage, BRCA2 participates in homology-directed DNA damage repair to maintain genome stability. Genome-wide association studies have identified an association between BRCA2 single nucleotide polymorphisms and plasma-lipid levels and lipid deregulation in humans. To date, DNA damage, apoptosis, and lipid deregulation are recognized as central pathways for endothelial dysfunction and atherosclerosis; however, the role of BRCA2 in endothelial dysfunction remains to be elucidated. To determine the role of BRCA2 in endothelial dysfunction, BRCA2 was silenced in human umbilical vein endothelial cells (ECs) and assessed for markers of DNA damage, apoptosis, and endothelial function following oxidized low-density lipoprotein (oxLDL) treatment. OxLDL was found to induce significant reactive oxygen species (ROS) production in BRCA2-silenced ECs. This increase in ROS production was associated with exacerbated DNA damage evidenced by increased expression and activation of DNA double-stranded break (DSB) marker γH2AX and reduced RAD51-foci formation-an essential regulator of DSB repair. Increased DSBs were associated with enhanced expression and activation of pro-apoptotic p53 and significant apoptosis in oxLDL-treated BRCA2-silenced ECs. Loss of BRCA2 in ECs was further associated with oxLDL-induced impaired tube-forming potential and eNOS expression. Collectively, the data reveals, for the first time, a novel role of BRCA2 as a regulator of EC survival and function in the setting of oxLDL treatment in vitro. Additionally, the data provide important clues regarding the potential susceptibility of BRCA2 mutation carriers to endothelial dysfunction, atherosclerosis, and other cardiovascular diseases.
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Affiliation(s)
- Shweta Singh
- Department of Medical BiophysicsSchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
| | - Hien Nguyen
- Department of Medical BiophysicsSchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
- Anatomy and Cell BiologySchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
| | - David Michels
- Department of Medical BiophysicsSchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
| | - Hannah Bazinet
- Department of Medical BiophysicsSchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
| | - Pratiek N. Matkar
- Division of CardiologyKeenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael's HospitalTorontoONCanada
- Institute of Medical ScienceUniversity of TorontoTorontoONCanada
| | - Zongyi Liu
- Department of Medical BiophysicsSchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
| | - Lilian Esene
- Department of Medical BiophysicsSchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
| | - Mohamed Adam
- Division of CardiologyKeenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael's HospitalTorontoONCanada
- Institute of Medical ScienceUniversity of TorontoTorontoONCanada
| | - Antoinette Bugyei‐Twum
- Division of CardiologyKeenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael's HospitalTorontoONCanada
- Institute of Medical ScienceUniversity of TorontoTorontoONCanada
| | - Elizabeth Mebrahtu
- Department of Medical BiophysicsSchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
| | - Jameela Joseph
- Department of Medical BiophysicsSchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
- Department of BiologyUniversity of Western OntarioLondonONCanada
| | - Mehroz Ehsan
- Department of Medical BiophysicsSchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
| | - Hao H. Chen
- Division of CardiologyKeenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael's HospitalTorontoONCanada
- Institute of Medical ScienceUniversity of TorontoTorontoONCanada
| | - Mohammad Qadura
- Institute of Medical ScienceUniversity of TorontoTorontoONCanada
- Vascular SurgeryKeenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael’s HospitalTorontoONCanada
- Department of SurgeryUniversity of TorontoTorontoONCanada
| | - Krishna K. Singh
- Department of Medical BiophysicsSchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
- Anatomy and Cell BiologySchulich School of Medicine and DentistryUniversity of Western OntarioLondonONCanada
- Institute of Medical ScienceUniversity of TorontoTorontoONCanada
- Vascular SurgeryKeenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael’s HospitalTorontoONCanada
- Department of SurgeryUniversity of TorontoTorontoONCanada
- Pharmacology and ToxicologyUniversity of TorontoTorontoONCanada
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Sood S, Imsirovic A, Sains P, Singh KK, Sajid MS. Epigastric port retrieval of the gallbladder following laparoscopic cholecystectomy is associated with the reduced risk of port site infection and port site incisional hernia: An updated meta-analysis of randomized controlled trials. Ann Med Surg (Lond) 2020; 55:244-251. [PMID: 32528673 PMCID: PMC7283097 DOI: 10.1016/j.amsu.2020.05.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 05/06/2020] [Accepted: 05/11/2020] [Indexed: 11/29/2022] Open
Abstract
Aims The objective of this article is to compare the surgical outcomes for epigastric port or umbilical port retrieval of the gallbladder (GB) following laparoscopic cholecystectomy (LC). Methods The data retrieved from the published randomized, controlled trials (RCT) comparing the surgical outcomes for epigastric port or umbilical port retrieval of the GB following LC was analysed using the principles of meta-analysis. The summated outcome of continuous variables was expressed as standardized mean difference (SMD) and dichotomous data was presented in odds ratio (OR). Results Eight RCTs on 2676 patients comparing the surgical outcomes for epigastric port or umbilical port retrieval of the GB following LC were analysed. In the random effects model analysis using the statistical software Review Manager 5.3, the GB retrieval through epigastric port was associated with the reduced duration of operation (SMD, 0.41; 95% CI, 0.18, 0.64; z = 3.52; P = 0.0004). Epigastric retrieval was also associated with reduced risk of surgical site infection (OR, 1.95; 95% CI, 0.75, 5.11; z = 1.36; P = 0.17), and port site incisional hernia (OR, 4.22; 95% CI, 0.43, 41.40; z = 1.24; P = 0.22) compared to umbilical port retrieval though it did not reach statistical significance. The need for port enlargement to retrieve the GB was similar in both groups. In contrast, the umbilical port retrieval of the GB was associated with significantly less post-operative pain (SMD, −0.51; 95% CI, −0.95, −0.06; z = 2.24; P = 0.03), reduced GB perforation rate, reduced port site bleeding rate and reduced difficulty in GB retrieval. Conclusion GB retrieval through epigastric port following LC has clinically proven advantage of reduced retrieval site infection rate, lower operation time and incisional hernia rate but at the cost of increased pain at 24 h, higher risk of GB perforation, port site bleeding and technical difficulties. An updated meta-analysis providing better evidence on gall bladder extraction port following laparoscopic cholecystectomy(LC). Epigastric port retrieval of gallbladder following LC has advantage of reduced rate of both infection and incisional hernia. Umbilical port retrieval of gallbladder following LC has advantage of reduced pain, port site bleeding and perforation risk. In conclusion from this meta-analysis epigastric port retrieval seems to be more advantageous compared to the umbilical port.
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Affiliation(s)
- Sumit Sood
- Department of General Surgery, University Hospitals of Coventry and Warwickshire, United Kingdom
- Corresponding author. University Hospitals of Coventry and Warwickshire, Clifford Bridge Rd, Coventry, CV2 2DX, United Kingdom.
| | - Anja Imsirovic
- Department of Digestive Diseases & Gastrointestinal Surgery, Brighton & Sussex University Hospitals NHS Trust, The Royal Sussex County Hospital, Eastern Road, Brighton, West Sussex, BN2 5BE, United Kingdom
| | - Parv Sains
- Department of Digestive Diseases & Gastrointestinal Surgery, Brighton & Sussex University Hospitals NHS Trust, The Royal Sussex County Hospital, Eastern Road, Brighton, West Sussex, BN2 5BE, United Kingdom
| | - Krishna K Singh
- Department of Digestive Diseases & Gastrointestinal Surgery, Brighton & Sussex University Hospitals NHS Trust, The Royal Sussex County Hospital, Eastern Road, Brighton, West Sussex, BN2 5BE, United Kingdom
| | - Muhammad S Sajid
- Department of Digestive Diseases & Gastrointestinal Surgery, Brighton & Sussex University Hospitals NHS Trust, The Royal Sussex County Hospital, Eastern Road, Brighton, West Sussex, BN2 5BE, United Kingdom
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Syed MH, Zamzam A, Valencia J, Khan H, Jain S, Singh KK, Abdin R, Qadura M. MicroRNA Profile of Patients with Chronic Limb-Threatening Ischemia. Diagnostics (Basel) 2020; 10:diagnostics10040230. [PMID: 32316437 PMCID: PMC7235988 DOI: 10.3390/diagnostics10040230] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 04/11/2020] [Accepted: 04/14/2020] [Indexed: 12/20/2022] Open
Abstract
Chronic limb-threatening ischemia (CLTI) results in devastating complications such as lower-limb amputations. In this study, a genome-wide plasma microRNAs (miRNA) sequencing was performed to identify miRNA(s) associated with CLTI. Blood samples were collected from early stage CLTI patients (ABI < 0.9) and non-PAD controls (ABI ≥ 0.9) for 3 experiments: discovery phase (n = 23), confirmatory phase (n = 52) and validation phase (n = 20). In the discovery phase, next generation sequencing (NGS) was used to identify miRNA circulating in the plasma CLTI (n = 13) patients, compared to non-PAD controls (n = 10). Two down-regulated miRNAs (miRNA-6843-3p and miRNA-6766-5p) and three upregulated miRNAs (miRNA-1827, miRNA-320 and miRNA-98-3p) were identified (≥2-fold change). In the confirmatory phase, these 5 deregulated miRNAs were further investigated in non-PAD (n = 21) and CTLI (n = 31) patients using qRT-PCR. Only miRNA-1827 was found to be significantly upregulated (≥3-fold, p-value < 0. 001) in the CLTI group. Lastly, to minimize the influence of confounding factors, miRNA-1827 plasma levels were validated in a third cohort of CLTI patients (n = 10) matched to non-PAD controls (n = 10). Our analysis demonstrated that miRNA-1827 expression was increased in the CLTI cohort (≥2-folds, p-value < 0.001). In summary, circulating miRNA-1827 is significantly elevated in patients with CLTI.
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Affiliation(s)
- Muzammil H. Syed
- Division of Vascular Surgery, St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada; (M.H.S.); (A.Z.); (J.V.); (H.K.); (S.J.)
| | - Abdelrahman Zamzam
- Division of Vascular Surgery, St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada; (M.H.S.); (A.Z.); (J.V.); (H.K.); (S.J.)
| | - Jason Valencia
- Division of Vascular Surgery, St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada; (M.H.S.); (A.Z.); (J.V.); (H.K.); (S.J.)
| | - Hamzah Khan
- Division of Vascular Surgery, St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada; (M.H.S.); (A.Z.); (J.V.); (H.K.); (S.J.)
| | - Shubha Jain
- Division of Vascular Surgery, St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada; (M.H.S.); (A.Z.); (J.V.); (H.K.); (S.J.)
| | - Krishna K. Singh
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON N6A 5C1, Canada;
| | - Rawand Abdin
- Department of Medicine, McMaster University, Hamilton, ON L8S 4K1, Canada;
| | - Mohammad Qadura
- Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute of St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada
- Department of Surgery, University of Toronto, Toronto, ON M5T 1P5, Canada
- Correspondence: ; Tel.: +1-416-864-5154
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Singh S, Adam M, Matkar PN, Bugyei-Twum A, Desjardins JF, Chen HH, Nguyen H, Bazinet H, Michels D, Liu Z, Mebrahtu E, Esene L, Joseph J, Ehsan M, Qadura M, Connelly KA, Leong-Poi H, Singh KK. Endothelial-specific Loss of IFT88 Promotes Endothelial-to-Mesenchymal Transition and Exacerbates Bleomycin-induced Pulmonary Fibrosis. Sci Rep 2020; 10:4466. [PMID: 32161282 PMCID: PMC7066128 DOI: 10.1038/s41598-020-61292-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 02/19/2020] [Indexed: 11/09/2022] Open
Abstract
Intraflagellar transport protein 88 (Ift88) is required for ciliogenesis and shear stress-induced dissolution of cilia in embryonic endothelial cells coincides with endothelial-to-mesenchymal transition (EndMT) in the developing heart. EndMT is also suggested to underlie heart and lung fibrosis, however, the mechanism linking endothelial Ift88, its effect on EndMT and organ fibrosis remains mainly unexplored. We silenced Ift88 in endothelial cells (ECs) in vitro and generated endothelial cell-specific Ift88-knockout mice (Ift88endo) in vivo to evaluate EndMT and its contribution towards organ fibrosis, respectively. Ift88-silencing in ECs led to mesenchymal cells-like changes in endothelial cells. The expression level of the endothelial markers (CD31, Tie-2 and VE-cadherin) were significantly reduced with a concomitant increase in the expression level of mesenchymal markers (αSMA, N-Cadherin and FSP-1) in Ift88-silenced ECs. Increased EndMT was associated with increased expression of profibrotic Collagen I expression and increased proliferation in Ift88-silenced ECs. Loss of Ift88 in ECs was further associated with increased expression of Sonic Hedgehog signaling effectors. In vivo, endothelial cells isolated from the heart and lung of Ift88endo mice demonstrated loss of Ift88 expression in the endothelium. The Ift88endo mice were born in expected Mendelian ratios without any adverse cardiac phenotypes at baseline. Cardiac and pulmonary endothelial cells isolated from the Ift88endo mice demonstrated signs of EndMT and bleomycin treatment exacerbated pulmonary fibrosis in Ift88endo mice. Pressure overload stress in the form of aortic banding did not reveal a significant difference in cardiac fibrosis between Ift88endo mice and control mice. Our findings demonstrate a novel association between endothelial cilia with EndMT and cell proliferation and also show that loss of endothelial cilia-associated increase in EndMT contributes specifically towards pulmonary fibrosis.
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Affiliation(s)
- Shweta Singh
- Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON, N6A 5C1, Canada
| | - Mohamed Adam
- Division of Cardiology, Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, M5S 1A1, Canada
| | - Pratiek N Matkar
- Division of Cardiology, Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, M5S 1A1, Canada
| | - Antoinette Bugyei-Twum
- Division of Cardiology, Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, M5S 1A1, Canada
| | - Jean-Francois Desjardins
- Division of Cardiology, Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada
| | - Hao H Chen
- Division of Cardiology, Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, M5S 1A1, Canada
| | - Hien Nguyen
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada.,Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada
| | - Hannah Bazinet
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada
| | - David Michels
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada
| | - Zongyi Liu
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada
| | - Elizabeth Mebrahtu
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada
| | - Lillian Esene
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada
| | - Jameela Joseph
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada.,Department of Biology, University of Western Ontario, London, ON, N6A 5C1, Canada
| | - Mehroz Ehsan
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada
| | - Mohammad Qadura
- Vascular Surgery, Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, M5S 1A1, Canada
| | - Kim A Connelly
- Division of Cardiology, Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, M5S 1A1, Canada
| | - Howard Leong-Poi
- Division of Cardiology, Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, M5S 1A1, Canada
| | - Krishna K Singh
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada. .,Vascular Surgery, Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada. .,Institute of Medical Science, University of Toronto, Toronto, ON, M5S 1A1, Canada. .,Department of Pharmacology and Toxicology, University of Toronto, Toronto, ON, M5S 1A1, Canada. .,Departments of Surgery, University of Toronto, Toronto, ON, M5S 1A1, Canada. .,Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada.
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Tharranum AM, Singh KK, Pandey AC, Singh YP, Kandpal BK. Evaluation of forewarning models for mustard aphids in different agro-climatic zones of India. Int J Biometeorol 2020; 64:445-460. [PMID: 31788743 DOI: 10.1007/s00484-019-01831-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 10/23/2019] [Accepted: 11/09/2019] [Indexed: 06/10/2023]
Abstract
Mustard aphid, Lipaphis erysimi (Kaltenbach), is the most serious pest of Rapeseed-Mustard which is known to be responsible for a tremendous loss in yield and oil content, under various agro-climatic conditions of India. Information support on aphid occurrence and intensity is necessary for effective management by the farmers in the mustard-growing belt. In this study, an effort is made to develop forewarning model using the field data on aphid for 12 consecutive rabi seasons from 2003-2004 to 2014-2015 under different agro-climatic locations in India. Three main components of aphid-related stages were identified for which necessary forewarnings were needed to be issued: (1) severity, (2) the time of reaching the economic threshold level (ETL) for decision-making on pesticide application, and (3) time of occurrence of peak population. To address these, three different models were developed/used and validated using incident field dataset. Those field observations when the infestation level were below severe category (< 60) during rising phase of the aphid population were found to indicate highest R sqr. (0.82) for the model-I during validation. When model-II was used, 11 out of 14 locations (78.57%) stood validated. The assumptions made in model-III also got validated when humidity thermal ratio (HTR) of the week of peak population ranged between 1.5 and 4 (lowest among the weeks considered), and population reached severe category. The models showed better results during real-time validation in seasons 2016-2017 and 2017-2018, thus suggesting that these three models can be used to ascertain the severity, week of ETL, and week of peak aphid population for Brassica juncea varieties all over the mustard belt in India and can be operationalized spatially to forewarn against the aphid pest population in future under Gramin Krishi Mausam Sewa (GKMS) scheme.
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Affiliation(s)
- A Mehnaj Tharranum
- Agromet Advisory Service Division, India Meteorological Department, New Delhi, India.
| | - K K Singh
- Agromet Advisory Service Division, India Meteorological Department, New Delhi, India
| | | | - Y P Singh
- Indian Council of Agricultural Research, New Delhi, India
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31
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Sajid MS, Ray K, Hebbar M, Riaz W, Baig MK, Sains P, Singh KK. South Coast appendicular mass management (SCAM) survey. Transl Gastroenterol Hepatol 2020; 5:4. [PMID: 32190772 DOI: 10.21037/tgh.2019.11.07] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Accepted: 11/05/2019] [Indexed: 12/29/2022] Open
Abstract
Background Management of appendicular mass and interval appendicectomy remains a controversial issue. Recent publication of a randomized controlled trial (RCT) reported the incidence of around 20% neoplastic lesions in the age group of more than forty years among the interval appendicectomy group against magnetic resonance imaging (MRI) surveillance only which led to trial termination. The objective of this study is to evaluate the current practice of the management of appendicular mass in five major hospitals of South Coast of the England. Methods A proforma was designed and emailed to the general surgical department of five hospitals in the South Coast of England. The proforma completion rate and compliance were improved by direct telephone call to the on-call registrars and consultants to collect data. Results Fifty-three surgeons (22 consultants, 27 ST3-ST8 grade surgical trainees and 4 SAS grades) completed the proforma. The clinical, hematological and computerized tomography (CT) based diagnostic criteria, and in-patient intravenous antibiotics (IV ABTXs) in addition to the radiological drainage in amenable cases for appendicular mass/abscess were mostly agreed initial management plan among surgeons. Normalization of inflammatory markers and radiological resolution were agreed discharge indicators. Agreed follow up investigations were CT scan (by 23%), Colonoscopy (by 13%), and both CT and colonoscopy (by 57%) after discharging patients. Only 17% surgeons offered planned interval appendicectomy and 62% surgeons offered interval appendectomy in selective cases of appendicular mass within 6 weeks to 6 months after discharge. Conclusions South Coast appendicular mass management (SCAM) survey confirms diverse practice to manage appendicular mass/abscess among surgeons working in South Coast hospitals. A substantial percentage of surgeons do not offer interval appendectomy to patients potentially leaving neoplastic lesions in situ.
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Affiliation(s)
- Muhammad S Sajid
- Department of Digestive diseases, Brighton & Sussex University Hospitals NHS Trust, The Royal Sussex County Hospital, Brighton, West Sussex, UK
| | - Kausik Ray
- Department of General and Laparoscopic Colorectal Surgery, Brighton & Sussex University Hospitals NHS Trust, The Royal Sussex County Hospital, Brighton, West Sussex, UK
| | - Madhusoodhana Hebbar
- Department of General and Laparoscopic Colorectal Surgery, Western Sussex Hospitals NHS Foundation Trust, Worthing Hospital, Worthing, West Sussex, UK
| | - Waleed Riaz
- Department of General and Laparoscopic Colorectal Surgery, East Surrey Hospital, Redhill, UK
| | - Mirza K Baig
- Department of General and Laparoscopic Colorectal Surgery, Western Sussex Hospitals NHS Foundation Trust, Worthing Hospital, Worthing, West Sussex, UK
| | - Parv Sains
- Department of General and Laparoscopic Colorectal Surgery, Brighton & Sussex University Hospitals NHS Trust, The Royal Sussex County Hospital, Brighton, West Sussex, UK
| | - Krishna K Singh
- Department of Digestive diseases, Brighton & Sussex University Hospitals NHS Trust, The Royal Sussex County Hospital, Brighton, West Sussex, UK
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Bugyei-Twum A, Ford C, Civitarese R, Seegobin J, Advani SL, Desjardins JF, Kabir G, Zhang Y, Mitchell M, Switzer J, Thai K, Shen V, Abadeh A, Singh KK, Billia F, Advani A, Gilbert RE, Connelly KA. Sirtuin 1 activation attenuates cardiac fibrosis in a rodent pressure overload model by modifying Smad2/3 transactivation. Cardiovasc Res 2019; 114:1629-1641. [PMID: 29800064 DOI: 10.1093/cvr/cvy131] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 05/17/2018] [Indexed: 12/14/2022] Open
Abstract
Aims Transforming growth factor β1 (TGF-β1) is a prosclerotic cytokine involved in cardiac remodelling leading to heart failure (HF). Acetylation/de-acetylation of specific lysine residues in Smad2/3 has been shown to regulate TGF-β signalling by altering its transcriptional activity. Recently, the lysine de-acetylase sirtuin 1 (SIRT1) has been shown to have a cardioprotective effect; however, SIRT1 expression and activity are paradoxically reduced in HF. Herein, we investigate whether pharmacological activation of SIRT1 would induce cardioprotection in a pressure overload model and assess the impact of SIRT1 activation on TGF-β signalling and the fibrotic response. Methods and results Eight weeks old male C57BL/6 mice were randomized to undergo sham surgery or transverse aortic constriction (TAC) to induce pressure overload. Post-surgery, animals were further randomized to receive SRT1720 or vehicle treatment. Echocardiography, pressure-volume loops, and histological analysis revealed an impairment in cardiac function and deleterious left ventricular remodelling in TAC-operated animals that was improved with SRT1720 treatment. Genetic ablation and cell culture studies using a Smad-binding response element revealed SIRT1 to be a specific target of SRT1720 and identified Smad2/3 as a SIRT1 specific substrate. Conclusion Overall, our data demonstrate that Smad2/3 is a specific SIRT1 target and suggests that pharmacological activation of SIRT1 may be a novel therapeutic strategy to prevent/reverse HF via modifying Smad activity.
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Affiliation(s)
- Antoinette Bugyei-Twum
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada.,Institute of Medical Science, University of Toronto, 1 King's College Circle, Toronto, Ontario, Canada
| | - Christopher Ford
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada
| | - Robert Civitarese
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada
| | - Jessica Seegobin
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada
| | - Suzanne L Advani
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada
| | - Jean-Francois Desjardins
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada
| | - Golam Kabir
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada
| | - Yanling Zhang
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada
| | - Melissa Mitchell
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada
| | - Jennifer Switzer
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada
| | - Kerri Thai
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada
| | - Vanessa Shen
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada
| | - Armin Abadeh
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada
| | - Krishna K Singh
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada
| | - Filio Billia
- Division of Cardiology, Peter Munk Cardiac Centre, Toronto General Hospital, University Health Network, University of Toronto, Toronto, Ontario, Canada
| | - Andrew Advani
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada
| | - Richard E Gilbert
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada
| | - Kim A Connelly
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, 209 Victoria Street, Toronto, Ontario, Canada.,Institute of Medical Science, University of Toronto, 1 King's College Circle, Toronto, Ontario, Canada
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Adam M, Singh KK, Connelly KA. P5434P300-mediated inactivation of p53 protects against doxorubicin-induced cardiotoxicity. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Introduction
Doxorubicin is amongst the most widely prescribed chemotherapy drugs due to its effectiveness in cancer treatment. However, progressive treatment using doxorubicin severely increases the risk of congestive heart failure. Mechanistically, researchers have shown that doxorubicin (i) intercalates into DNA and disrupts topoisomerase-II-mediated DNA repair and (ii) generates free radicals which then causes damage to cellular membranes, DNA, and proteins. Ultimately these cellular insults induce cardiomyocyte (CM) death mediated by the tumour suppressor, p53. Currently, there are no clinically applicable preventative treatments for doxorubicin-induced cardiotoxicity and so, extensive research is being done in discovering a potential therapy. One such candidate is curcumin – a natural polyphenol compound non-toxic to humans. We have previously demonstrated that curcumin inhibits lysine acetyltransferase activity of p300, therefore reducing both histone and non-histone protein acetylation. To induce CM death, p53 requires acetylation by p300. Therefore, we hypothesize that curcumin protects against doxorubicin-induced CM death and cardiotoxicity via p300-mediated inactivation of p53.
Methods
Rat H9c2 cardiomyoblast cells were cultured and treated with a 2.5 μM dose of doxorubicin for 16 hours. One group of cells were pre-treated with curcumin (15μM) 4 hours prior to doxorubicin treatment, and controls were cultured with only diluent added. Following treatment, the cells were harvested for total protein. At end point, we performed immunoblotting to measure protein expression of key proteins involved in DNA damage (y-H2A.X, p53), and apoptosis (cleaved-Caspase 3).
Results
Our findings show that following doxorubicin treatment, p53 expression was significantly increased (p<0.001), confirming its role in doxorubicin-associated cardiotoxicity. Furthermore, doxorubicin was associated with increased DNA-damage as evidenced by increased expression and activation of DNA double-stranded breaks (DSBs) marker, y-H2A.X (p<0.001). Elevated levels of DNA-damage were further associated with significantly increased doxorubicin-induced apoptosis as measured by immunoblotting for cleaved-Caspase 3 (p<0.001). However, DNA-damage and apoptosis were attenuated by pre-treatment of cells with curcumin. Curcumin treatment led to a significant decrease in both y-H2A.X (p<0.01) and cleaved-Caspase 3 (p<0.01) expression compared to cells treated with only doxorubicin.
Conclusions
Our data provides the first evidence that curcumin protects against doxorubicin-induced apoptosis in rat cardiomyoblast cells in vitro. Further studies are warranted in vivo to confirm the potential of curcumin as a cardio-protective drug. Curcumin is a natural compound with little to no side-effects in humans, therefore our finding may provide a novel therapeutic target and treatment approach for doxorubicin-associated cardiotoxicity.
Acknowledgement/Funding
Heart & Stroke Foundation of Canada
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Affiliation(s)
- M Adam
- St. Michael's Hospital, Toronto, Canada
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Singh KK, Singh DP, Singh R, Saini DK. In vitro and in vivo Assessment of Protein Acetylation Status in Mycobacteria. Bio Protoc 2019; 9:e3291. [PMID: 33654804 DOI: 10.21769/bioprotoc.3291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 06/11/2019] [Accepted: 06/11/2019] [Indexed: 11/02/2022] Open
Abstract
Protein acetylation is one of the standard post-translational modifications found in proteins across all organisms, along with phosphorylation which regulates diverse cellular processes. Acetylation of proteins can be enzymatically catalyzed through acetyltransferases, acetyl CoA synthetases or non-enzymatically through acyl carrier metabolic intermediates. In this protocol, using response regulator proteins as targets we describe the experimental strategy for probing the occurrence of acetylation using purified recombinant proteins in an in vitro setup. Further using M. smegmatis strains overexpressing the wild type or mutant response regulator protein, we also describe how in vivo acetylation can be validated in Mycobacterial proteins. The described approach can be used for analyzing acetylation of any mycobacterial protein under both in vitro and in vivo conditions.
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Affiliation(s)
- Krishna K Singh
- Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore, India.,Institute of Biomedical Sciences, Bundelkhand University, Jhansi, India
| | - Devendra P Singh
- Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore, India
| | - Rambir Singh
- Institute of Biomedical Sciences, Bundelkhand University, Jhansi, India
| | - Deepak K Saini
- Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore, India.,Centre for Biosystems Science and Engineering, Indian Institute of Science, Bangalore, India
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Matkar PN, Jong ED, Ariyagunarajah R, Prud'homme GJ, Singh KK, Leong-Poi H. Jack of many trades: Multifaceted role of neuropilins in pancreatic cancer. Cancer Med 2018; 7:5036-5046. [PMID: 30216699 PMCID: PMC6198212 DOI: 10.1002/cam4.1715] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 06/04/2018] [Accepted: 07/13/2018] [Indexed: 12/11/2022] Open
Abstract
Neuropilins (NRPs) have been described as receptors for class 3 semaphorins and coreceptors for a plethora of ligands, such as members of the vascular endothelial growth factor (VEGF) family of angiogenic cytokines and transforming growth factor (TGF). Initial studies using genetic models have indicated that neuropilin-1 (NRP-1) is essential for axonal guidance during neuronal and cardiovascular development, regulated via semaphorins and VEGF, respectively, whereas the other homolog of neuropilin, NRP-2, has been shown to play a more specific role in neuronal patterning and lymphangiogenesis. Pancreatic ductal adenocarcinoma (PDAC) remains a significant cause of cancer mortality with the lowest five-year survival rate compared to other types of cancer. Recent findings have indicated that NRPs are abundantly expressed in pancreatic cancer cell lines and pancreatic tumor tissues, where they mediate several essential cancer-initiating and cancer-promoting functional responses through their unique ability to bind multiple ligands. Specifically, NRPs have been implicated in numerous biological processes such as cancer cell proliferation, survival, invasion, and tumor growth. More recently, several other protumorigenic roles mediated by NRPs have emerged, advocating NRPs as ideal therapeutic targets against PDAC.
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Affiliation(s)
- Pratiek N Matkar
- Division of Cardiology, Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, Ontario, Canada.,Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
| | - Eric D Jong
- Department of Biology, University of New Brunswick, Fredericton, New Brunswick, Canada
| | | | - Gerald J Prud'homme
- Laboratory Medicine, Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, Ontario, Canada.,Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - Krishna K Singh
- Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada.,Vascular Surgery, Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, Ontario, Canada.,Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario, Canada.,Department of Surgery, University of Toronto, Toronto, Ontario, Canada.,Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | - Howard Leong-Poi
- Division of Cardiology, Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, Ontario, Canada.,Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
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36
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Murugavel S, Bugyei-Twum A, Matkar PN, Al-Mubarak H, Chen HH, Adam M, Jain S, Narang T, Abdin RM, Qadura M, Connelly KA, Leong-Poi H, Singh KK. Valproic Acid Induces Endothelial-to-Mesenchymal Transition-Like Phenotypic Switching. Front Pharmacol 2018; 9:737. [PMID: 30050438 PMCID: PMC6050396 DOI: 10.3389/fphar.2018.00737] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Accepted: 06/18/2018] [Indexed: 12/14/2022] Open
Abstract
Valproic acid (VPA), a histone deacetylase (HDAC) inhibitor, is a widely used anticonvulsant drug that is currently undergoing clinical evaluation for anticancer therapy due to its anti-angiogenic potential. Endothelial cells (ECs) can transition into mesenchymal cells and this form of EC plasticity is called endothelial-to-mesenchymal transition (EndMT), which is widely implicated in several pathologies including cancer and organ fibrosis. However, the effect of VPA on EC plasticity and EndMT remains completely unknown. We report herein that VPA-treatment significantly inhibits tube formation, migration, nitric oxide production, proliferation and migration in ECs. A microscopic evaluation revealed, and qPCR, immunofluorescence and immunoblotting data confirmed EndMT-like phenotypic switching as well as an increased expression of pro-fibrotic genes in VPA-treated ECs. Furthermore, our data confirmed important and regulatory role played by TGFβ-signaling in VPA-induced EndMT. Our qPCR array data performed for 84 endothelial genes further supported our findings and demonstrated 28 significantly and differentially regulated genes mainly implicated in angiogenesis, endothelial function, EndMT and fibrosis. We, for the first time report that VPA-treatment associated EndMT contributes to the VPA-associated loss of endothelial function. Our data also suggest that VPA based therapeutics may exacerbate endothelial dysfunction and EndMT-related phenotype in patients undergoing anticonvulsant or anticancer therapy, warranting further investigation.
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Affiliation(s)
| | - Antoinette Bugyei-Twum
- Division of Cardiology, Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, Canada
| | - Pratiek N Matkar
- Division of Cardiology, Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, Canada
| | - Husain Al-Mubarak
- Institute of Medical Science, University of Toronto, Toronto, ON, Canada
| | - Hao H Chen
- Division of Cardiology, Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, Canada
| | - Mohamed Adam
- Division of Cardiology, Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, Canada
| | - Shubha Jain
- Vascular Surgery, Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, Canada
| | - Tanya Narang
- Faculty of Science, York University, Toronto, ON, Canada
| | - Rawand M Abdin
- Department of Medicine, McMaster University, Hamilton, ON, Canada
| | - Mohammad Qadura
- Institute of Medical Science, University of Toronto, Toronto, ON, Canada.,Vascular Surgery, Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, Canada
| | - Kim A Connelly
- Division of Cardiology, Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, Canada
| | - Howard Leong-Poi
- Division of Cardiology, Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, Canada
| | - Krishna K Singh
- Institute of Medical Science, University of Toronto, Toronto, ON, Canada.,Vascular Surgery, Keenan Research Centre for Biomedical Science and Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, ON, Canada.,Department of Pharmacology and Toxicology, University of Toronto, Toronto, ON, Canada.,Department of Surgery, University of Toronto, Toronto, ON, Canada.,Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, Canada
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Adam M, Murugavel S, Bugyei-Twum A, Narang T, Jain S, Pan Y, Qadura M, Connelly KA, Al-Omran M, Verma S, Singh KK. BRCA2 is a Novel Regulator of Endothelial Cell Function and Apoptosis Following Oxidative Stress. ATHEROSCLEROSIS SUPP 2018. [DOI: 10.1016/j.atherosclerosissup.2018.04.338] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Sajid MS, Bovis J, Rehman S, Singh KK. Prophylactic antibiotics at the time of elective cholecystectomy are effective in reducing the post-operative infective complications: a systematic review and meta-analysis. Transl Gastroenterol Hepatol 2018; 3:22. [PMID: 29780900 DOI: 10.21037/tgh.2018.04.06] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 04/16/2018] [Indexed: 11/06/2022] Open
Abstract
Background The objective of this article is to evaluate the role of prophylactic antibiotics in preventing the infective complications in patients undergoing elective laparoscopic cholecystectomy (ELC). Methods A systematic review of the literature on the published randomized, controlled reporting the role of prophylactic antibiotics in preventing the infective complications in patients undergoing ELC was undertaken using the principles of meta-analysis. Results Twenty-five RCTs on 6,138 patients evaluating the infective complications in patients undergoing ELC were systematically analysed. There were 3,099 patients in antibiotics group and 3,039 patients in no-antibiotics group. The risk of surgical site infection (SSI) [odds ratio (OR), 0.75 (95% CI, 0.52-1.07), P=0.11], distant infection [OR, 0.66 (95% CI, 0.21-2.14), P=0.49] and residual abscess [OR, 0.93 (95% CI, 0.23-3.81), P=0.92] was lower in the antibiotics group but statistical significance was not reached. However, the risk of overall all type of infective complications was statistically lower [OR, 0.69 (95% CI, 0.50-0.95), P=0.02] in the antibiotics group. Subsequently, this was reflected into the reduced length of hospitalization [standardized mean difference (SMD), -0.32 (95% CI, -0.54--0.10), P=0.004] in the antibiotics group. Conclusions Use of prophylactic antibiotics at the time of induction in patients undergoing ELC has clinically proven advantage of reducing the post-operative infective complications.
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Affiliation(s)
- Muhammad S Sajid
- Department of Gastrointestinal Surgery, Brighton and Sussex University Hospitals NHS Trust, Eastern Road, Brighton, East Sussex, BN2 5BE, UK
| | - Joanna Bovis
- Department of General, Endoscopic and Laparoscopic Colorectal Surgery, Western Sussex Hospitals NHS Trust, Worthing Hospital, Worthing, West Sussex, BN11 2DH, UK
| | - Saad Rehman
- Department of Gastrointestinal Surgery, Brighton and Sussex University Hospitals NHS Trust, Eastern Road, Brighton, East Sussex, BN2 5BE, UK
| | - Krishna K Singh
- Department of Gastrointestinal Surgery, Brighton and Sussex University Hospitals NHS Trust, Eastern Road, Brighton, East Sussex, BN2 5BE, UK
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Sajid MS, Rehman S, Chedgy F, Singh KK. Improving the mucosal visualization at gastroscopy: a systematic review and meta-analysis of randomized, controlled trials reporting the role of Simethicone ± N-acetylcysteine. Transl Gastroenterol Hepatol 2018; 3:29. [PMID: 29971260 DOI: 10.21037/tgh.2018.05.02] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2018] [Accepted: 05/03/2018] [Indexed: 01/01/2023] Open
Abstract
Background The objective of this article is to study the role of Simethicone ± N-acetylcysteine in improving the mucosal visualization during oesophago-gastro-duodenoscopy (OGD). Methods The data retrieved from the published randomized controlled trials (RCTs) reporting the role of Simethicone ± N-acetylcysteine during OGD was analysed using the principles of meta-analysis. The summated outcome of continuous variables was expressed as standardized mean difference (SMD) and dichotomous data was presented in odds ratio (OR). Results Three RCTs on 654 patients reported OGD with and without pre-procedure oral administration of Simethicone ± N-acetylcysteine evaluating visibility as good or excellent in number during the procedure. In the random effects model analysis using the statistical software Review Manager 5.3, the use of Simethicone ± N-acetylcysteine was associated with improved (OR, 0.43; 95% CI, 0.28, 0.68; z=3.65; P=0.0003) mucosal visibility. Four RCTs on 364 patients reported OGD with and without pre-procedure oral administration of Simethicone ± N-acetylcysteine evaluating visibility score in study group. In the random effects model analysis using the statistical software Review Manager 5.3, the use of Simethicone ± N-acetylcysteine was associated with improved (SMD, -1.66; 95% CI, -1.93, -1.40; z=12.25; P=0.00001) mucosal visibility score compared to no-Simethicone group. Conclusions The findings of current study on 1,099 patients successfully demonstrate that the pre-procedure oral administration of Simethicone ± N-acetylcysteine improves mucosal visualization and mucosal visualization score during OGD.
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Affiliation(s)
- Muhammad Shafique Sajid
- Department of General and Colorectal Surgery, Brighton & Sussex University Hospitals NHS Trust, The Royal Sussex County Hospital, Brighton, UK
| | - Saad Rehman
- Department of General and Colorectal Surgery, Brighton & Sussex University Hospitals NHS Trust, The Royal Sussex County Hospital, Brighton, UK
| | - Fergus Chedgy
- Department of Gastroenterology & Hepatology, Brighton & Sussex University Hospitals NHS Trust, The Royal Sussex County Hospital, Brighton, UK
| | - Krishna K Singh
- Department of General and Upper GI Surgery, Brighton & Sussex University Hospitals NHS Trust, The Royal Sussex County Hospital, Brighton, UK
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Das P, Mondal GC, Singh S, Singh AK, Prasad B, Singh KK. Effluent Treatment Technologies in the Iron and Steel Industry - A State of the Art Review. Water Environ Res 2018; 90:395-408. [PMID: 29678211 DOI: 10.2175/106143017x15131012152951] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Iron and steel industry is the principal driving force propelling economic and technological growth of a nation. However, since its inception this industry is associated with widespread environmental pollution and enormous water consumption. Different units of a steel plant discharge effluents loaded with toxic, hazardous pollutants, and unutilized components which necessitates mitigation. In this paper, pollutant removal efficiency, effluent volume product quality, and economic feasibility of existing treatments are studied vis-à-vis their merits, demerits, and innovations to access their shortcomings which can be overcome with new technology to identify future research directions. While conventional methods are inadequate for complete remediation and water reclamation, the potential of advanced treatments, like membrane separation, remains relatively untapped. It is concluded that integrated systems combining membrane separation with chemical treatments can guarantee a high degree of contaminant removal, reusability of effluents concurrently leading to process intensification ensuring ecofriendliness and commercial viability.
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Ramadan A, Singh KK, Quan A, Plant PJ, Al-Omran M, Teoh H, Verma S. Loss of vascular smooth muscle cell autophagy exacerbates angiotensin II-associated aortic remodeling. J Vasc Surg 2017; 68:859-871. [PMID: 29273297 DOI: 10.1016/j.jvs.2017.08.086] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Accepted: 08/25/2017] [Indexed: 11/18/2022]
Abstract
OBJECTIVE The pathophysiologic processes of abdominal aortic aneurysms (AAAs) and atherosclerosis often intersect. Given that anomalies in vascular smooth muscle cell (SMC) autophagy have been noted in models of atherosclerosis, we sought to evaluate the potential role that SMC autophagy may play in the initiation and progression of AAAs. METHODS Studies were conducted in ATG7flx/flxSM22α-Cretg/+ (SMC ATG7 knockout [SMC-ATG7-KO]) and ATG7WT/WT; SM22α-Cretg/+ (SMC ATG7 wild-type [SMC-ATG7-WT]) littermates that were continuously infused with angiotensin II (Ang II; 1.5 mg/kg/d) for up to 12 weeks. Mortality, morbidity, hemodynamics, and aortic remodeling were documented. RESULTS During the 12-week observation window, all of the Ang II-treated SMC-ATG-WT mice (n = 6) survived, whereas 10 of the 19 Ang II-treated SMC-ATG-KO mice had died by week 7 (log-rank test, P < .001). Mean arterial pressure (128.07 ± 3.4 mm Hg for Ang II-treated SMC-ATG-KO vs 138.5 ± 5.87 mm Hg for Ang II-treated SMC-ATG-WT mice) and diastolic arterial pressure (109.7 ± 2.55 mm Hg for Ang II-treated SMC-ATG7-KO vs 119.4 ± 2.12 mm Hg for Ang II-treated SMC-ATG7-WT mice) were significantly different between the two groups (P < .01). Cardiac rupture, myocardial infarct, end-organ damage, pleural effusion, and venous distention were noted in Ang II-treated SMC-ATG7-KO but not in Ang II-treated SMC-ATG7-WT mice. Although the suprarenal aortic diameters of the Ang II-treated SMC-ATG7-KO group demonstrated a trending increase (at week 4, 1.26 ± 0.06 mm [n = 14] for Ang II-treated SMC-ATG-KO mice vs 1.09 ± 0.02 mm [n = 5] for Ang II-treated SMC-ATG-WT mice; P < .05), only 2 of the 19 developed abdominal aortic dissections. CONCLUSIONS Mice with SMC ATG7 deficiency that are chronically infused with Ang II do not tend to develop dissecting AAA but do exhibit adverse aortic remodeling and appreciable cardiac failure-associated mortality.
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Affiliation(s)
- Azza Ramadan
- Division of Cardiac Surgery, St. Michael's Hospital, Toronto, Ontario, Canada; Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
| | - Krishna K Singh
- Division of Cardiac Surgery, St. Michael's Hospital, Toronto, Ontario, Canada; Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada; Division of Vascular Surgery, St. Michael's Hospital, Toronto, Ontario, Canada; Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Adrian Quan
- Division of Cardiac Surgery, St. Michael's Hospital, Toronto, Ontario, Canada; Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Pamela J Plant
- Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Mohammed Al-Omran
- Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada; Division of Vascular Surgery, St. Michael's Hospital, Toronto, Ontario, Canada; Department of Surgery, University of Toronto, Toronto, Ontario, Canada; Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Ontario, Canada; Department of Surgery, King Saud University, Riyadh, Kingdom of Saudi Arabia; King Saud University-Li Ka Shing Collaborative Research Program, Riyadh, Kingdom of Saudi Arabia
| | - Hwee Teoh
- Division of Cardiac Surgery, St. Michael's Hospital, Toronto, Ontario, Canada; Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Ontario, Canada; Division of Endocrinology and Metabolism, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Subodh Verma
- Division of Cardiac Surgery, St. Michael's Hospital, Toronto, Ontario, Canada; Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada; Department of Surgery, University of Toronto, Toronto, Ontario, Canada; Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Ontario, Canada; Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario, Canada.
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Kulkarni C, Kelly AL, Gough T, Jadhav V, Singh KK, Paradkar A. Application of hot melt extrusion for improving bioavailability of artemisinin a thermolabile drug. Drug Dev Ind Pharm 2017; 44:206-214. [PMID: 29145748 DOI: 10.1080/03639045.2017.1386200] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Hot melt extrusion has been used to produce a solid dispersion of the thermolabile drug artemisinin. Formulation and process conditions were optimized prior to evaluation of dissolution and biopharmaceutical performance. Soluplus®, a low Tg amphiphilic polymer especially designed for solid dispersions enabled melt extrusion at 110 °C although some drug-polymer incompatibility was observed. Addition of 5% citric acid as a pH modifier was found to suppress the degradation. The area under plasma concentration time curve (AUC0-24h) and peak plasma concentration (Cmax) were four times higher for the modified solid dispersion compared to that of pure artemisinin.
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Affiliation(s)
- C Kulkarni
- a Centre of Pharmaceutical Engineering Science , University of Bradford , Bradford , UK
| | - A L Kelly
- a Centre of Pharmaceutical Engineering Science , University of Bradford , Bradford , UK
| | - T Gough
- a Centre of Pharmaceutical Engineering Science , University of Bradford , Bradford , UK
| | - V Jadhav
- b C U Shah College of Pharmacy , Shreemati Nathibai Damodar Thackersey (SNDT) Women's University , Mumbai , India
| | - K K Singh
- c School of Pharmacy and Biomedical Sciences , University of Central Lancashire , Preston, Lancashire , UK
| | - A Paradkar
- a Centre of Pharmaceutical Engineering Science , University of Bradford , Bradford , UK
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Matkar PN, Ariyagunarajah R, Leong-Poi H, Singh KK. Friends Turned Foes: Angiogenic Growth Factors beyond Angiogenesis. Biomolecules 2017; 7:biom7040074. [PMID: 28974056 PMCID: PMC5745456 DOI: 10.3390/biom7040074] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Revised: 09/15/2017] [Accepted: 09/22/2017] [Indexed: 12/13/2022] Open
Abstract
Angiogenesis, the formation of new blood vessels from pre-existing ones is a biological process that ensures an adequate blood flow is maintained to provide the cells with a sufficient supply of nutrients and oxygen within the body. Numerous soluble growth factors and inhibitors, cytokines, proteases as well as extracellular matrix proteins and adhesion molecules stringently regulate the multi-factorial process of angiogenesis. The properties and interactions of key angiogenic molecules such as vascular endothelial growth factors (VEGFs), fibroblast growth factors (FGFs) and angiopoietins have been investigated in great detail with respect to their molecular impact on angiogenesis. Since the discovery of angiogenic growth factors, much research has been focused on their biological actions and their potential use as therapeutic targets for angiogenic or anti-angiogenic strategies in a context-dependent manner depending on the pathologies. It is generally accepted that these factors play an indispensable role in angiogenesis. However, it is becoming increasingly evident that this is not their only role and it is likely that the angiogenic factors have important functions in a wider range of biological and pathological processes. The additional roles played by these molecules in numerous pathologies and biological processes beyond angiogenesis are discussed in this review.
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Affiliation(s)
- Pratiek N Matkar
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, ON M5B 1W8, Canada.
- Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada.
| | | | - Howard Leong-Poi
- Division of Cardiology, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, ON M5B 1W8, Canada.
- Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada.
| | - Krishna K Singh
- Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada.
- Division of Vascular Surgery, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, ON M5B 1W8, Canada.
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, ON M5S 1A8, Canada.
- Department of Surgery, University of Toronto, Toronto, ON M5S 1A8, Canada.
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Singh KK, Chaudhary SK, Venugopal R, Gaurav A. Bulk synthesis of multi-walled carbon nanotubes by AC arc discharge method. Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems 2017. [DOI: 10.1177/2397791417712836] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
This work proposes the production of multi-walled carbon nanotubes by AC arc discharging of spectroscopically pure graphite electrodes of different shapes, that is, movable cylindrical and stationary rectangular electrode by manual metal arc welding setup. Continuous arc was generated by maintaining the gap of about 3 mm between the electrodes which in turn formed the plasma zone. Vaporization of carbon cations followed by sudden quenching paved the way for formation of carbon nantotubes. Nanotubes produced were deposited on the stationary graphite electrode in the form of soot. Further extraction of the nanoparticles from the soot was performed by conducting series of purification processes which will be discussed in upcoming chapters. Morphology and purity of the extracted nanotubes were investigated by X-ray diffraction, scanning electron microscopy, field-emission scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. Following the characterization process, it was observed that the so-produced nanotubes were of different shapes, that is, carbon cone nanotubes, nanocapsules, nanoparticles and branching type and randomly oriented. The length of the nanotubes varied from 231 to 561 nm, whereas diameter was found to be in the range of 14–55 nm.
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Affiliation(s)
- KK Singh
- Department of Mechanical Engineering, IIT (ISM), Dhanbad, India
| | - SK Chaudhary
- Department of Mechanical Engineering, B.I.T. Sindri, Dhanbad, India
| | - R Venugopal
- Department of Fuel and Mineral Engineering, IIT (ISM), Dhanbad, India
| | - A Gaurav
- Department of Mechanical Engineering, IIT (ISM), Dhanbad, India
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Matkar PN, Singh KK, Prud’homme G, Hedley D, Leong-Poi H. Abstract 1198: Neuropilin-1 blockade chemosensitizes pancreatic cancer cells via dual inhibition of epithelial-mesenchymal transition and autophagy. Cancer Res 2017. [DOI: 10.1158/1538-7445.am2017-1198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Introduction: Fibrotic and malignant pancreatic ductal adenocarcinoma (PDAC) tumors are often resistant to chemotherapy, and remain a leading cause of morbidity and mortality. Epithelial–mesenchymal transition (EMT), a process by which epithelial cells lose their cell polarity and adhesion to become migratory and invasive mesenchymal stem cells, contributes to chemoresistance in PDAC. Likewise, PDAC tumors benefit from autophagy, a self-degradation pathway that confers a survival benefit against metabolic stress. Over-activation of EMT and autophagy has been linked to increased drug resistance in PDAC. Both these processes are largely mediated by TGFβ1. Recently, we demonstrated the role of neuropilin-1 (NRP-1) in TGFβ1-dependent endothelial-mesenchymal transition and fibrosis in PDAC. However, the potential mechanisms linking NRP-1 with EMT and autophagy-mediated chemoresistance remain unexplored. We hypothesized that NRP-1 blockade will enhance chemotherapeutic effect, by suppressing EMT and autophagy in PDAC.
Methods: Human PDAC cells (BxPC-3) or serially gemcitabine exposed chemoresistant (CR-BxPC-3) cells were transfected with siNRP-1 or scramble using DharmaFECT-2. For EMT and chemotherapy studies, transfected cells were treated with TGFβ1 (5ng/mL, 24h), followed by gemcitabine (1μM) for 48h. RNA (24h) and protein (48h) was isolated using TRIzolTM and RIPA, respectively. EMT markers were evaluated by RT-PCR and immunoblotting/immunostaining. For autophagy studies, cells were serum starved post NRP-1 silencing and protein was isolated. For autophagy inhibition, cells were treated with bafilomycin-A1 (100nM) for 24h post NRP-1 silencing and protein was isolated. Autophagy flux (LC3-II/I) and P62 were measured by immunoblotting/immunostaining. Cell viability was evaluated by MTT assay.
Results: SiNRP-1 treatment in BxPC-3 and CR-BxPC-3 cells resulted in NRP-1 knockdown and promoted cell-death after chemotherapy. TGFβ1-stimulated BxPC-3 cells demonstrated a morphological change consistent with EMT that was revoked by siNRP-1. Also, siNRP-1 maintained epithelial cellular morphology via gain of epithelial and loss of mesenchymal markers. Remarkably, CR-BxPC-3 cells exhibited enhanced EMT features. SiNRP-1 inhibited EMT and promoted cell-death by overcoming gemcitabine resistance in CR-BxPC-3 cells, possibly through reduced ERK signaling. Moreover, siNRP-1 inhibited autophagy (decreased LC3-II/I ratio and increased P62 levels) following starvation or chemotherapy stress, and enhanced cell-death after chemotherapy and autophagy inhibition in BxPC-3 cells.
Conclusions: Our findings define a previously undetermined role of NRP-1 in regulating autophagy and TGFβ1-induced EMT in PDAC, suggesting that NRP-1 may represent a novel therapeutic target to overcome chemoresistance through reduced EMT and autophagy.
Citation Format: Pratiek N. Matkar, Krishna K. Singh, Gerald Prud’homme, David Hedley, Howard Leong-Poi. Neuropilin-1 blockade chemosensitizes pancreatic cancer cells via dual inhibition of epithelial-mesenchymal transition and autophagy [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 1198. doi:10.1158/1538-7445.AM2017-1198
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Mantella LE, Singh KK, Sandhu P, Kantores C, Ramadan A, Khyzha N, Quan A, Al-Omran M, Fish JE, Jankov RP, Verma S. Fingerprint of long non-coding RNA regulated by cyclic mechanical stretch in human aortic smooth muscle cells: implications for hypertension. Mol Cell Biochem 2017; 435:163-173. [PMID: 28526936 DOI: 10.1007/s11010-017-3065-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2017] [Accepted: 05/05/2017] [Indexed: 11/26/2022]
Abstract
Emerging evidence suggests that long non-coding RNAs (lncRNAs) represent a cellular hub coordinating various cellular processes that are critical in health and disease. Mechanical stress triggers changes in vascular smooth muscle cells (VSMCs) that in turn contribute to pathophysiological changes within the vasculature. We sought to evaluate the role that lncRNAs play in mechanical stretch-induced alterations of human aortic smooth muscle cells (HASMCs). RNA (lncRNA and mRNA) samples isolated from HASMCs that had been subjected to 10 or 20% elongation (1 Hz) for 24 h were profiled with the Arraystar Human LncRNA Microarray V3.0. LncRNA expression was quantified in parallel via qRT-PCR. Of the 30,586 human lncRNAs screened, 580 were differentially expressed (DE, P < 0.05) in stretched HASMCs. Amongst the 26,109 protein-coding transcripts evaluated, 25 of those DE were associated with 25 of the aforementioned DE lncRNAs (P < 0.05). Subsequent Kyoto Encyclopedia of Genes and Genomes analysis revealed that the DE mRNAs were largely associated with the tumor necrosis factor signaling pathway and inflammation. Gene Ontology analysis indicated that the DE mRNAs were associated with cell differentiation, stress response, and response to external stimuli. We describe the first transcriptome profile of stretch-induced changes in HASMCs and provide novel insights into the regulatory switches that may be fundamental in governing aberrant VSMC remodeling.
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Affiliation(s)
- Laura-Eve Mantella
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, Canada
- Department of Pharmacology & Toxicology, University of Toronto, Toronto, ON, Canada
| | - Krishna K Singh
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, Canada
- Division of Vascular Surgery, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, Canada
- Department of Surgery, University of Toronto, Toronto, ON, Canada
| | - Paul Sandhu
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, Canada
| | - Crystal Kantores
- Lung Biology Programme, Physiology and Experimental Medicine, Hospital for Sick Children Research Institute, Toronto, ON, Canada
| | - Azza Ramadan
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, Canada
- Institute of Medical Science, University of Toronto, Toronto, ON, Canada
| | - Nadiya Khyzha
- Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
- Toronto General Research Institute, University Health Network, Toronto, ON, Canada
- Heart & Stroke Richard Lewar Centre of Excellence in Cardiovascular Research, University of Toronto, Toronto, ON, Canada
| | - Adrian Quan
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, Canada
| | - Mohammed Al-Omran
- Division of Vascular Surgery, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, Canada
- Department of Surgery, University of Toronto, Toronto, ON, Canada
- Department of Surgery, King Saud University, Riyadh, Kingdom of Saudi Arabia
- The King Saud University-Li Ka Shing Collaborative Research Program, Riyadh, Kingdom of Saudi Arabia
| | - Jason E Fish
- Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
- Toronto General Research Institute, University Health Network, Toronto, ON, Canada
- Heart & Stroke Richard Lewar Centre of Excellence in Cardiovascular Research, University of Toronto, Toronto, ON, Canada
| | - Robert P Jankov
- Department of Paediatrics, University of Toronto, Toronto, ON, Canada
- Department of Physiology, University of Toronto, Toronto, ON, Canada
- Lung Biology Programme, Physiology and Experimental Medicine, Hospital for Sick Children Research Institute, Toronto, ON, Canada
- Heart & Stroke Richard Lewar Centre of Excellence in Cardiovascular Research, University of Toronto, Toronto, ON, Canada
| | - Subodh Verma
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, Canada.
- Department of Pharmacology & Toxicology, University of Toronto, Toronto, ON, Canada.
- Department of Surgery, University of Toronto, Toronto, ON, Canada.
- Institute of Medical Science, University of Toronto, Toronto, ON, Canada.
- Heart & Stroke Richard Lewar Centre of Excellence in Cardiovascular Research, University of Toronto, Toronto, ON, Canada.
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Bugyei-Twum A, Switzer J, Singh KK, Connelly KA. Abstract 368: The GLP-1 Receptor Agonist Liraglutide Improves Autophagy Impairment in the Diabetic Heart. Arterioscler Thromb Vasc Biol 2017. [DOI: 10.1161/atvb.37.suppl_1.368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background:
Diabetes mellitus is a well-recognized risk factor for the development of heart failure. Although studies with the glucagon-like pepide-1 analog liraglutide—an approved treatment for type 2 diabetes—have demonstrated substantial cardioprotective effects of the drug in both human and experimental diabetes, the underlying mode of action/mechanism of liraglutide remains unclear. Here, we investigate the impact of liraglutide on autophagy—an evolutionary conserved mechanism thought to play an essential role in cell survival during stress—using a rodent model of type 2 diabetes, the Goto Kakizaki (GK) rat.
Methods:
Thirty-two weeks old male GK rats and sex/age-matched Wistar controls were treated with liraglutide (0.2 mg/kg/day) or PBS twice daily for 8 consecutive weeks. At 40-weeks of age, cardiac structure/function were assessed by echocardiography and LV tissue samples were collected to assess the expression of inducers/markers of autophagy (mTOR, phospho-mTOR, LC3-I/II, p62, and Beclin-1).
Results:
Autophagy was inhibited in the heart of diabetic GK animals when compared to Wistar controls, as confirmed by a significant increase in mTOR expression/activation—a negative regulator of autophagy. This was further confirmed by an observed decrease in the LC3 II/I ratio in diabetic GK animals when compared to controls (p<0.05). P62 expression levels, however, were found to be significantly upregulated in GK animals with respect to controls (p<0.01); suggesting an impairment or defect in basal autophagy in diabetic GK animals. Liraglutide-treatment—which was associated with an improvement in both HbA1C level and LV hypertrophy in GK animals—resulted a significant reduction in mTOR expression/activation in GK animals when compared to their untreated counterparts. This improvement in autophagy status was further corroborated by an observed increase in LC3 II/I ratio and Beclin-1, as well as a reduction in p62 expression levels.
Conclusion:
Overall, our data suggests that the cardioprotective effects of liraglutide may stem from its ability to activate autophagy in the diabetic heart and improve autophagy impairment in the setting of type 2 diabetes.
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Shi X, Verma S, Yun J, Brand-Arzamendi K, Singh KK, Liu X, Garg A, Quan A, Wen XY. Effect of empagliflozin on cardiac biomarkers in a zebrafish model of heart failure: clues to the EMPA-REG OUTCOME trial? Mol Cell Biochem 2017; 433:97-102. [DOI: 10.1007/s11010-017-3018-9] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 03/15/2017] [Indexed: 10/19/2022]
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Singh KK, Matkar PN, Pan Y, Quan A, Gupta V, Teoh H, Al-Omran M, Verma S. Endothelial long non-coding RNAs regulated by oxidized LDL. Mol Cell Biochem 2017; 431:139-149. [PMID: 28316063 DOI: 10.1007/s11010-017-2984-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 02/24/2017] [Indexed: 11/26/2022]
Abstract
Oxidized low-density lipoprotein (oxLDL) plays a central role in the pathogenesis of atherosclerosis, in part via an effect to promote endothelial dysfunction. In the present study, we evaluated the expression profiles of long non-coding RNAs (lncRNAs) and protein-coding mRNAs in endothelial cells following oxLDL stimulation. LncRNAs and mRNAs from human umbilical vein endothelial cells (HUVECs) were profiled with the Arraystar Human lncRNA Expression Microarray V3.0 following 24 h of oxLDL treatment (100 µg/mL). Of the 30,584 lncRNAs screened, 923 were significantly up-regulated and 975 significantly down-regulated (P < 0.05) in response to oxLDL exposure. In the same HUVEC samples, 518 of the 26,106 mRNAs screened were up-regulated and 572 were down-regulated. Of these differentially expressed lncRNAs, CLDN10-AS1 and CTC-459I6.1 were the most up-regulated (~87-fold) and down-regulated (~28-fold), respectively. Bioinformatic assignment of the differentially regulated genes into functional groups indicated that many are involved in signaling pathways among which are the cytokine receptor, chemokine, TNF, MAPK and Ras signaling pathways, olfactory transduction, and vascular smooth muscle cell function. This is the first report profiling oxLDL-mediated changes in lncRNA and mRNA expression in human endothelial cells. The novel targets revealed substantially extend the list of potential candidate genes involved in atherogenesis.
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Affiliation(s)
- Krishna K Singh
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada.
- Division of Vascular Surgery, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, 5E21 KRCBS, 30 Bond Street, Toronto, ON, M5B 1W8, Canada.
- Division of Endocrinology & Metabolism, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, Canada.
- Department of Surgery, University of Toronto, Toronto, ON, Canada.
| | - Pratiek N Matkar
- Division of Cardiology, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, Canada
| | - Yi Pan
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada
| | - Adrian Quan
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada
| | - Vijay Gupta
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada
| | - Hwee Teoh
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada
- Division of Endocrinology & Metabolism, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, Canada
| | - Mohammed Al-Omran
- Division of Vascular Surgery, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, 5E21 KRCBS, 30 Bond Street, Toronto, ON, M5B 1W8, Canada
- Department of Surgery, University of Toronto, Toronto, ON, Canada
- Department of Surgery, King Saud University and the King Saud University-Li Ka Shing Collaborative Research Program, Riyadh, Saudi Arabia
| | - Subodh Verma
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science of St. Michael's Hospital, Toronto, ON, M5B 1W8, Canada.
- Department of Surgery, University of Toronto, Toronto, ON, Canada.
- Department of Pharmacology & Toxicology, University of Toronto, Toronto, ON, Canada.
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Yau JW, Singh KK, Hou Y, Lei X, Ramadan A, Quan A, Teoh H, Kuebler WM, Al-Omran M, Yanagawa B, Ni H, Verma S. Endothelial-specific deletion of autophagy-related 7 (ATG7) attenuates arterial thrombosis in mice. J Thorac Cardiovasc Surg 2017; 154:978-988.e1. [PMID: 28400112 DOI: 10.1016/j.jtcvs.2017.02.058] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 02/01/2017] [Accepted: 02/17/2017] [Indexed: 01/29/2023]
Abstract
BACKGROUND Thrombosis persists as a leading cause of morbidity and mortality. Given that endothelial cells (ECs) play a central role in regulating thrombosis, understanding the molecular endothelial cues that regulate susceptibility or resistance to thrombosis have important translational implications. Accordingly, we evaluated the role of endothelial autophagy in the development of thrombosis. METHODS We generated mice in which the essential autophagy-related 7 (ATG7) gene was conditionally deleted from ECs (EC-ATG7-/- mice). Three in vivo models of thrombosis were used, and mechanistic studies were conducted with cultured human umbilical vein endothelial cells (HUVECs). RESULTS We silenced ATG7 in HUVECs and observed >60% decreases in tumor necrosis factor (TNF)-α-induced tissue factor (TF) transcript levels, protein expression, and activity. TF mRNA levels in the carotid arteries of EC-ATG7-/- mice subjected to the prothrombotic stimulus FeCl3 were lower than those in the similarly treated wild-type (WT) littermate group. Compared with WT mice, EC-ATG7-/- mice exhibited prolonged time to carotid (2-fold greater) and mesenteric (1.3-fold greater) artery occlusion following FeCl3 injury. The thrombi generated in laser-injured cremasteric arterioles were smaller in EC-ATG7-/- mice compared with WT mice, and took 2.3-fold longer to appear. CONCLUSIONS Taken together, these results provide definitive evidence that loss of endothelial ATG7 attenuates thrombosis and reduces the expression of TF. Our findings demonstrate that endothelial ATG7, and thus autophagy, is a critical and previously unrecognized target for modulating the susceptibility to thrombosis.
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Affiliation(s)
- Jonathan W Yau
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Krishna K Singh
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Division of Vascular Surgery, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Department of Surgery, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada; Department of Surgery, University of Toronto, Toronto, Ontario, Canada.
| | - Yan Hou
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Xi Lei
- Department of Laboratory Medicine, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Azza Ramadan
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
| | - Adrian Quan
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Hwee Teoh
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Division of Endocrinology and Metabolism, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Wolfgang M Kuebler
- Department of Surgery, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada; Department of Surgery, University of Toronto, Toronto, Ontario, Canada; Department of Physiology, University of Toronto, Toronto, Ontario, Canada; Institute of Physiology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Mohammed Al-Omran
- Division of Vascular Surgery, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Department of Surgery, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada; Department of Surgery, University of Toronto, Toronto, Ontario, Canada; Department of Surgery, King Saud University and the King Saud University-Li Ka Shing Collaborative Research Program, Riyadh, Kingdom of Saudi Arabia
| | - Bobby Yanagawa
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Department of Surgery, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Heyu Ni
- Department of Laboratory Medicine, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Department of Physiology, University of Toronto, Toronto, Ontario, Canada; Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada; Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Subodh Verma
- Division of Cardiac Surgery, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Department of Surgery, Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario, Canada; Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada; Department of Surgery, University of Toronto, Toronto, Ontario, Canada; Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario, Canada.
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