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Pham VM, Komirishetty P, Areti A, Poitras T, Thakor N, Zochodne DW. Combined PTEN knockdown and local insulin in chronic experimental diabetic neuropathy. Diabetes 2023; 72:795-811. [PMID: 36930748 DOI: 10.2337/db22-0743] [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] [Received: 08/30/2022] [Accepted: 02/27/2023] [Indexed: 03/19/2023]
Abstract
Diabetic polyneuropathy (DPN) renders progressive sensory neurodegeneration linked to hyperglycemia and its associated metabolopathy. Here we hypothesized that there may be additive impacts of direct insulin signaling, independent of glycemia and PTEN (phosphatase and tensin homolog deleted on chromosome 10) knockdown on neuropathy. Our targets for combined interventions were neurons and Schwann cells in vitro and chronic Type 1 DPN in mice. IR (insulin receptor) expression was not altered by high glucose conditions in neurons or SCs and insulin promoted survival of neurons and proliferation of SCs in vitro. There were additive impacts between insulin signaling and PTEN knockdown in sensory neuron outgrowth and in axon myelination by SCs. In a chronic long term mouse model of experimental DPN unilateral intra-hindpaw injections of a PTEN siRNA and local insulin had additive impacts on correcting key features of chronic experimental DPN independent of glycemia, including motor axon conduction, thermal and mechanical sensory loss. Moreover, combined interventions improved sural and tibial nerve myelin thickness, hindpaw epidermal innervation and pAkt expression in dorsal root ganglia sensory neurons. We conclude that local PTEN inhibition or knockdown and insulin provide additive trophic support for sensory neurons and SCs whilst reversing key abnormalities of experimental DPN but without requiring metabolic correction.
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Affiliation(s)
- Vuong M Pham
- Singapore Institute for Neurotechnology, National University of Singapore, Singapore
- Department of Biotechnology, Ho Chi Minh City University of Food Industry, Ho Chi Minh City, Vietnam
| | - Prashanth Komirishetty
- Neuroscience and Mental Health Institute, Alberta Diabetes Institute and Division of Neurology, Department of Medicine, University of Alberta, Edmonton, Canada, T6G 2G3
| | - Aparna Areti
- Neuroscience and Mental Health Institute, Alberta Diabetes Institute and Division of Neurology, Department of Medicine, University of Alberta, Edmonton, Canada, T6G 2G3
| | - Trevor Poitras
- Neuroscience and Mental Health Institute, Alberta Diabetes Institute and Division of Neurology, Department of Medicine, University of Alberta, Edmonton, Canada, T6G 2G3
| | - Nitish Thakor
- Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore
| | - Douglas W Zochodne
- Neuroscience and Mental Health Institute, Alberta Diabetes Institute and Division of Neurology, Department of Medicine, University of Alberta, Edmonton, Canada, T6G 2G3
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Pham VM, Thakor N. Insulin enhances neurite extension and myelination of diabetic neuropathy neurons. Korean J Pain 2022; 35:160-172. [PMID: 35354679 PMCID: PMC8977202 DOI: 10.3344/kjp.2022.35.2.160] [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] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 03/03/2022] [Accepted: 03/09/2022] [Indexed: 11/24/2022] Open
Abstract
Background The authors established an in vitro model of diabetic neuropathy based on the culture system of primary neurons and Schwann cells (SCs) to mimic similar symptoms observed in in vivo models of this complication, such as impaired neurite extension and impaired myelination. The model was then utilized to investigate the effects of insulin on enhancing neurite extension and myelination of diabetic neurons. Methods SCs and primary neurons were cultured under conditions mimicking hyperglycemia prepared by adding glucose to the basal culture medium. In a single culture, the proliferation and maturation of SCs and the neurite extension of neurons were evaluated. In a co-culture, the percentage of myelination of diabetic neurons was investigated. Insulin at different concentrations was supplemented to culture media to examine its effects on neurite extension and myelination. Results The cells showed similar symptoms observed in in vivo models of this complication. In a single culture, hyperglycemia attenuated the proliferation and maturation of SCs, induced apoptosis, and impaired neurite extension of both sensory and motor neurons. In a co-culture of SCs and neurons, the percentage of myelinated neurites in the hyperglycemia-treated group was significantly lower than that in the control group. This impaired neurite extension and myelination was reversed by the introduction of insulin to the hyperglycemic culture media. Conclusions Insulin may be a potential candidate for improving diabetic neuropathy. Insulin can function as a neurotrophic factor to support both neurons and SCs. Further research is needed to discover the potential of insulin in improving diabetic neuropathy.
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Affiliation(s)
- Vuong M Pham
- Singapore Institute for Neurotechnology, National University of Singapore, Singapore.,Department of Biotechnology, Ho Chi Minh City University of Food Industry, Ho Chi Minh City, Vietnam
| | - Nitish Thakor
- Singapore Institute for Neurotechnology, National University of Singapore, Singapore.,Department of Biomedical Engineering, National University of Singapore, Singapore.,Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, USA
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Abstract
Diabetic neuropathy is one of the most serious complications of diabetes, and its increase shows no sign of stopping. Furthermore, current clinical treatments do not yet approach the best effectiveness. Thus, the development of better strategies for treating diabetic neuropathy is an urgent matter. In this review, we first discuss the advantages and disadvantages of some major mouse models of diabetic neuropathy and then address the targets for mechanism-based treatment that have been studied. We also introduce our studies on each part. Using stem cells as a source of neurotrophic factors to target extrinsic factors of diabetic neuropathy, we found that they present a promising treatment.
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Affiliation(s)
- Vuong M Pham
- Department of Medical Chemistry, Kansai Medical University, Hirakata, Osaka, Japan; Singapore Institute for Neurotechnology (SINAPSE), National University of Singapore, Singapore
| | - Shinji Matsumura
- Department of Medical Chemistry, Kansai Medical University, Hirakata, Osaka, Japan
| | - Tayo Katano
- Department of Medical Chemistry, Kansai Medical University, Hirakata, Osaka, Japan
| | - Nobuo Funatsu
- Department of Medical Chemistry, Kansai Medical University, Hirakata, Osaka, Japan
| | - Seiji Ito
- Department of Medical Chemistry, Kansai Medical University, Hirakata; Department of Anesthesiology, Osaka Medical College, Takatsuki, Osaka, Japan
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Pham VM, Tu NH, Katano T, Matsumura S, Saito A, Yamada A, Furue H, Ito S. Impaired peripheral nerve regeneration in type-2 diabetic mouse model. Eur J Neurosci 2018; 47:126-139. [DOI: 10.1111/ejn.13771] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Revised: 11/02/2017] [Accepted: 11/02/2017] [Indexed: 12/11/2022]
Affiliation(s)
- Vuong M. Pham
- Department of Medical Chemistry; Kansai Medical University; 2-5-1 Shin-machi Hirakata 573-1010 Japan
| | - Nguyen Huu Tu
- Department of Medical Chemistry; Kansai Medical University; 2-5-1 Shin-machi Hirakata 573-1010 Japan
| | - Tayo Katano
- Department of Medical Chemistry; Kansai Medical University; 2-5-1 Shin-machi Hirakata 573-1010 Japan
| | - Shinji Matsumura
- Department of Medical Chemistry; Kansai Medical University; 2-5-1 Shin-machi Hirakata 573-1010 Japan
| | - Akira Saito
- Central Research Laboratory; Kansai Medical University; Hirakata Japan
| | - Akihiro Yamada
- Department of Neurophysiology; Hyogo College of Medicine; Nishinomiya Japan
| | - Hidemasa Furue
- Department of Neurophysiology; Hyogo College of Medicine; Nishinomiya Japan
| | - Seiji Ito
- Department of Medical Chemistry; Kansai Medical University; 2-5-1 Shin-machi Hirakata 573-1010 Japan
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Pham VM, Houilliez A, Schill A, Carpentier A, Herbaux B, Thevenon A. Study of the pressures applied by a Chêneau brace for correction of adolescent idiopathic scoliosis. Prosthet Orthot Int 2008; 32:345-55. [PMID: 18609033 DOI: 10.1080/03093640802016092] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [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: 02/03/2023]
Abstract
We performed a study on 32 idiopathic scoliotic patients (30 females, 2 males) treated with a Chêneau brace. Eighteen patients had a single right thoracic curve and 14 had a single right thoracolumbar curve. We used the TekScan system (ClinSeat Type 5315 Sensor, TekScan, Boston MA, USA) to measure pressures at the skin-brace interface, assess the effect of strap tension and analyze the variation of these pressures with position and activity. The TekScan device enabled identification of the pressure areas corresponding to the brace's three loading points. The pressure under the main pad had a greater mean value than the pressure under the two counter-pads. Tightening the straps led to a significant increase in the pressures, whatever the position studied or the curve pattern. Compared with the standing (reference) position, we observed significantly higher pressures during maximal inspiration (p < 0.001) and lower pressures during maximal expiration, in the prone position and after having risen from a lying position, for both thoracic curves (p < 0.001) and thoracolumbar curves (p < 0.01). The pressures for thoracolumbar curves were lower than those for thoracic curves, whatever the position studied and both before and after strap adjustment. For lying positions, lying on the right side produced the greatest increase pressure. Even though the TekScan system does not provide direct information on the correction of spinal curvature, it appears to be a useful tool in the treatment of scoliotic patients. Strap adjustment clearly influences the applied pressures - particularly those on the rib cage. During activity, there is a natural tendency to decrease the pressure; this justifies efforts to maintain strap tensions in general and during day wear in particular.
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Affiliation(s)
- V M Pham
- Rehabilitation Department, Swynghedauw Hospital, Lille, France
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Calvo E, Pham VM, Ribeiro JMC. An insight into the sialotranscriptome of the non-blood feeding Toxorhynchites amboinensis mosquito. Insect Biochem Mol Biol 2008; 38:499-507. [PMID: 18405828 PMCID: PMC2481231 DOI: 10.1016/j.ibmb.2007.12.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2007] [Revised: 12/13/2007] [Accepted: 12/18/2007] [Indexed: 05/10/2023]
Abstract
All adult mosquitoes take sugar meals, and most adult females also take blood meals to develop eggs. Salivary glands (SG) of males are thus much smaller and do not contain many of the antihemostatic and antiinflammatory compounds found in females. In the past 5 years, transcriptome analyses have identified nearly 70 different genes expressed in adult female SG. For most of these, no function can be assigned in either blood or sugar feeding. Exceptionally, Toxorhynchites mosquitoes are unusual in that they never feed on blood, and the SG of adults are identical in both sexes. Transcriptome analysis of the adult SG of this mosquito was performed to increase knowledge of the evolution of blood feeding--and to identify polypeptide families associated with sugar feeding--in mosquitoes.
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Affiliation(s)
- E Calvo
- Section of Vector Biology, Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD 20852, USA
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Pham VM, Houlliez A, Carpentier A, Herbaux B, Schill A, Thevenon A. Determination of the influence of the Chêneau brace on quality of life for adolescent with idiopathic scoliosis. ACTA ACUST UNITED AC 2007; 51:3-8, 9-15. [PMID: 18093679 DOI: 10.1016/j.annrmp.2007.08.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2007] [Accepted: 08/20/2007] [Indexed: 11/18/2022]
Abstract
OBJECTIVE The main objective is to determine the influence of treatment by Chêneau brace on the quality of life (QoL) of adolescents with idiopathic scoliosis. MATERIAL AND METHOD We used the QoL scale of Climent et al. "the Quality of Life Profile for Spine Deformities" (QLPSD, in which a higher score means a worse QoL) and visual analogue scales (VAS) for pain and for QoL ranging from 0 to 100mm. The study includes 108 subjects divided in three groups, a control group of 32 patients without brace, a full-time treated group (wearing a Chêneau brace 23/24 hours) of 41 patients, and a part-time treated group (wearing the brace during the night only) of 35 patients. RESULTS The QoL is significantly worse in the full-time treated group than in the group with night treatment and in the group without brace for the psychosocial functioning, the sleep disturbances, the back flexibility (P<0.001), the body image (P<0.01), as well as the overall score (P<0.001). On the other hand, there was no difference for the back pain. Among patients wearing the brace, the girls had an average QLPSD score higher than the boys for the psychosocial functioning, the body image, the overall score (P<0.05) and the back flexibility (P<0.01). Whereas there was no significant difference between the sexes for the sleep disturbances and the back pain. The QoL of patients who wear the brace was significantly correlated with degrees corrected wearing the brace and the patient's satisfaction on his or her health status. However, this correlation was very weak. On the other hand, there was no correlation between the quality of life and the age, the duration of brace treatment or the skeletal maturity (Risser sign). On VAS, the patients without brace have the highest score of QoL, followed the part-time treated patients while the full-time treated patients have the lowest score. CONCLUSION The wearing of the Chêneau brace involves a significant reduction in the QoL whatever instruments of evaluations of QoL, QLPSD or VAS. The QoL of the full-time treated patients was the lowest followed part-time treated patients while the QoL of the patients without brace was the highest. However, the brace does not influence the back pain in idiopathic scoliosis at teenage.
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Affiliation(s)
- V M Pham
- Service de médecine physique et réadaptation, hôpital P.-Swynghedauw, rue du Pr-A.-Verhaeghe, 59037 Lille cedex, France
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Noriega FG, Ribeiro JMC, Koener JF, Valenzuela JG, Hernandez-Martinez S, Pham VM, Feyereisen R. Comparative genomics of insect juvenile hormone biosynthesis. Insect Biochem Mol Biol 2006; 36:366-74. [PMID: 16551550 PMCID: PMC2662747 DOI: 10.1016/j.ibmb.2006.01.013] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
The biosynthesis of insect juvenile hormone (JH) and its neuroendocrine control are attractive targets for chemical control of insect pests and vectors of disease. To facilitate the molecular study of JH biosynthesis, we analyzed ESTs from the glands producing JH, the corpora allata (CA) in the cockroach Diploptera punctata, an insect long used as a physiological model species and compared them with ESTs from the CA of the mosquitoes Aedes aegypti and Anopheles albimanus. The predicted genes were analyzed according to their probable functions with the Gene Ontology classification, and compared to Drosophila and Anopheles gambiae genes. A large number of reciprocal matches in the cDNA libraries of cockroach and mosquito CA were found. These matches defined known and suspected enzymes of the JH biosynthetic pathway, but also several proteins associated with signal transduction that might play a role in the modulation of JH synthesis by neuropeptides. The identification in both cockroach and mosquito CA of homologs of the small ligand binding proteins from insects, Takeout/JH binding protein and retinol-binding protein highlights a hitherto unsuspected complexity of metabolite trafficking, perhaps JH precursor trafficking, in these endocrine glands. Furthermore, many reciprocal matches for genes of unknown function may provide a fertile ground for an in-depth study of allatal-specific cell physiology. ESTs are deposited in GenBank under the accession numbers DV 017592-DV 018447 (Diploptera punctata); DR 746432-DV 747949 (Aedes aegypti); and DR 747950-DR 748310 (Anopheles albimanus).
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Affiliation(s)
- F G Noriega
- Department of Biological Sciences, Florida International University, 11200 SW 8th Street, Miami, FL 33199, USA.
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Ribeiro JMC, Andersen J, Silva-Neto MAC, Pham VM, Garfield MK, Valenzuela JG. Exploring the sialome of the blood-sucking bug Rhodnius prolixus. Insect Biochem Mol Biol 2004; 34:61-79. [PMID: 14976983 DOI: 10.1016/j.ibmb.2003.09.004] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Rhodnius prolixus is a Hemiptera that feeds exclusively on vertebrate blood in all life stages. Its salivary glands produce potent pharmacological substances that counteract host hemostasis, including anti-clotting, anti-platelet, and vasodilatory substances. To obtain a further insight into the salivary biochemical and pharmacological complexity of this insect, a cDNA library was randomly sequenced, and salivary gland homogenates were fractionated by HPLC to obtain aminoterminal sequences of abundantly expressed proteins. Results indicate a remarkable expansion of the lipocalin family in Rhodnius salivary glands, among other protein sequences described. A summary of 31 new full length proteins deducted from their mRNA sequence is described, including several new members of the nitrophorin, triabin, and pallidipin families. The electronic version of the complete tables is available at http://www.ncbi.nlm.nih.gov/projects/vectors/rhodnius_prolixus.
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Affiliation(s)
- J M C Ribeiro
- Medical Entomology Section, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases/NIH, 4 Center Drive, Room 4/126, MSC 0425, Bethesda, MD 20892-0425, USA.
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Valenzuela JG, Pham VM, Garfield MK, Francischetti IMB, Ribeiro JMC. Toward a description of the sialome of the adult female mosquito Aedes aegypti. Insect Biochem Mol Biol 2002; 32:1101-1122. [PMID: 12213246 DOI: 10.1016/s0965-1748(02)00047-4] [Citation(s) in RCA: 109] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
To describe the set of mRNA and protein expressed in the salivary glands (sialome) of Aedes aegypti mosquitoes, we randomly sequenced a full-length cDNA library of this insect and performed Edman degradation of PVDF-transferred protein bands from salivary homogenates. We found 238 cDNA clusters which contained those coding for 10 of the 11 proteins found by aminoterminal degradation. All six previously described salivary proteins were found in this library. Full-length sequences of 32 novel cDNA sequences are reported, one of which is the product of a transposable element. Among the 31 novel protein sequences are 4 additional members of the D7 protein family; 4 novel members of the antigen 5 family (a protein family not reported in Aedes); a novel serpin; a novel member of the 30-kDa allergen of Ae. Aegypti; a secreted calreticulin; 2 proteins similar to mammalian angiopoietins; adenosine deaminase; purine hydrolase; lysozyme; a C-type lectin; 3 serine proteases, including one with high similarity to Bombyx prophenoloxidase activating enzyme; 2 proteins related to invertebrate immunity; and several sequences that have no significant matches to known proteins. The possible role of these proteins in blood and sugar feeding by the mosquito is discussed.
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Affiliation(s)
- J G Valenzuela
- Medical Entomology Section, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 4 Center Drive, Room 4/126, Bethesda, MD 20892-0425, USA
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