1
|
Lenin R, Jha KA, Gentry J, Shrestha A, Culp EV, Vaithianathan T, Gangaraju R. Tauroursodeoxycholic Acid Alleviates Endoplasmic Reticulum Stress-Mediated Visual Deficits in Diabetic tie2-TNF Transgenic Mice via TGR5 Signaling. J Ocul Pharmacol Ther 2023; 39:159-174. [PMID: 36791327 PMCID: PMC10081728 DOI: 10.1089/jop.2022.0117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 12/11/2022] [Indexed: 02/17/2023] Open
Abstract
Purpose: This study evaluated if tauroursodeoxycholic acid (TUDCA) alleviates pro-inflammatory and endoplasmic reticulum (ER) stress-mediated visual deficits in diabetic tie2-TNF transgenic mice via Takeda G protein-coupled receptor 5 (TGR5) receptor signaling. Methods: Adult tie2-TNF transgenic or age-matched C57BL/6J (wildtype, WT) mice were made diabetic and treated subcutaneously with TUDCA. After 4 weeks, visual function, vascular permeability, immunohistology, and molecular analyses were assessed. Human retinal endothelial cells (HRECs) silenced for TGR5, followed by TNF and high glucose (HG) stress-mediated endothelial permeability, and transendothelial migration of activated leukocytes were assessed with TUDCA in vitro. Results: Compared with WT mice, tie2-TNF mice showed a decreased visual function correlated with a decrease in protein kinase C α (PKCα) in rod bipolar cells, and increased vascular permeability was further exacerbated in diabetic-tie2-TNF mice. Conversely, TUDCA alleviated these changes in diabetic mice. An increase in inflammation and ER stress in retina coincided with an increase in TGR5 expression in diabetic tie2-TNF mice that decreased with TUDCA. In vitro, HRECs exposed to TNF+HG demonstrated >2-fold increase in TGR5 expression, a 3-fold increase in leukocyte transmigration with a concomitant increase in permeability. Although TUDCA reversed these effects, HRECs silenced for TGR5 and challenged with TUDCA or TGR5 agonist failed to reverse the TNF+HG induced effects. Conclusions: Our data suggest that TUDCA will serve as an excellent therapeutic agent for diabetic complications addressing both vascular and neurodegenerative changes in the retina. Perturbation of the TGR5 receptor in the retina might play a role in linking retinal ER stress to neurovascular dysfunction in diabetic retinopathy.
Collapse
Affiliation(s)
- Raji Lenin
- Department of Ophthalmology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Kumar Abhiram Jha
- Department of Ophthalmology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Jordy Gentry
- Department of Ophthalmology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Abhishek Shrestha
- Department of Pharmacology, Addiction Science, and Toxicology, and The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Erielle V. Culp
- Department of Pharmacology, Addiction Science, and Toxicology, and The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Thirumalini Vaithianathan
- Department of Ophthalmology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
- Department of Pharmacology, Addiction Science, and Toxicology, and The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Rajashekhar Gangaraju
- Department of Ophthalmology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
- Department of Anatomy & Neurobiology, The University of Tennessee Health Science Center, Memphis, Tennessee, USA
| |
Collapse
|
3
|
Pluquet O, Abbadie C. Cellular senescence and tumor promotion: Role of the Unfolded Protein Response. Adv Cancer Res 2021; 150:285-334. [PMID: 33858599 DOI: 10.1016/bs.acr.2021.01.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Senescence is a cellular state which can be viewed as a stress response phenotype implicated in various physiological and pathological processes, including cancer. Therefore, it is of fundamental importance to understand why and how a cell acquires and maintains a senescent phenotype. Direct evidence has pointed to the homeostasis of the endoplasmic reticulum whose control appears strikingly affected during senescence. The endoplasmic reticulum is one of the sensing organelles that transduce signals between different pathways in order to adapt a functional proteome upon intrinsic or extrinsic challenges. One of these signaling pathways is the Unfolded Protein Response (UPR), which has been shown to be activated during senescence. Its exact contribution to senescence onset, maintenance, and escape, however, is still poorly understood. In this article, we review the mechanisms through which the UPR contributes to the appearance and maintenance of characteristic senescent features. We also discuss whether the perturbation of the endoplasmic reticulum proteostasis or accumulation of misfolded proteins could be possible causes of senescence, and-as a consequence-to what extent the UPR components could be considered as therapeutic targets allowing for the elimination of senescent cells or altering their secretome to prevent neoplastic transformation.
Collapse
Affiliation(s)
- Olivier Pluquet
- Univ Lille, CNRS, Inserm, CHU Lille, UMR9020-U1277-CANTHER-Cancer Heterogeneity Plasticity and Resistance to Therapies, Lille, France.
| | - Corinne Abbadie
- Univ Lille, CNRS, Inserm, CHU Lille, UMR9020-U1277-CANTHER-Cancer Heterogeneity Plasticity and Resistance to Therapies, Lille, France
| |
Collapse
|
4
|
The Emerging Role of Senescence in Ocular Disease. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:2583601. [PMID: 32215170 PMCID: PMC7085400 DOI: 10.1155/2020/2583601] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Accepted: 02/14/2020] [Indexed: 02/07/2023]
Abstract
Cellular senescence is a state of irreversible cell cycle arrest in response to an array of cellular stresses. An important role for senescence has been shown for a number of pathophysiological conditions that include cardiovascular disease, pulmonary fibrosis, and diseases of the skin. However, whether senescence contributes to the progression of age-related macular degeneration (AMD) has not been studied in detail so far and the present review describes the recent research on this topic. We present an overview of the types of senescence, pathways of senescence, senescence-associated secretory phenotype (SASP), the role of mitochondria, and their functional implications along with antisenescent therapies. As a central mechanism, senescent cells can impact the surrounding tissue microenvironment via the secretion of a pool of bioactive molecules, termed the SASP. An updated summary of a number of new members of the ever-growing SASP family is presented. Further, we introduce the significance of mechanisms by which mitochondria may participate in the development of cellular senescence. Emerging evidence shows that extracellular vesicles (EVs) are important mediators of the effects of senescent cells on their microenvironment. Based on recent studies, there is reasonable evidence that senescence could be a modifiable factor, and hence, it may be possible to delay age-related diseases by modulating basic aging mechanisms using SASP inhibitors/senolytic drugs. Thus, antisenescent therapies in aging and age-related diseases appear to have a promising potential.
Collapse
|
5
|
Jha KA, Pentecost M, Lenin R, Gentry J, Klaic L, Del Mar N, Reiner A, Yang CH, Pfeffer LM, Sohl N, Gangaraju R. TSG-6 in conditioned media from adipose mesenchymal stem cells protects against visual deficits in mild traumatic brain injury model through neurovascular modulation. Stem Cell Res Ther 2019; 10:318. [PMID: 31690344 PMCID: PMC6833275 DOI: 10.1186/s13287-019-1436-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 09/21/2019] [Accepted: 09/30/2019] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Retinal inflammation affecting the neurovascular unit may play a role in the development of visual deficits following mild traumatic brain injury (mTBI). We have shown that concentrated conditioned media from adipose tissue-derived mesenchymal stem cells (ASC-CCM) can limit retinal damage from blast injury and improve visual function. In this study, we addressed the hypothesis that TNFα-stimulated gene-6 (TSG-6), an anti-inflammatory protein released by mesenchymal cells, mediates the observed therapeutic potential of ASCs via neurovascular modulation. METHODS About 12-week-old C57Bl/6 mice were subjected to 50-psi air pulse on the left side of the head overlying the forebrain resulting in an mTBI. Age-matched sham blast mice served as control. About 1 μl of ASC-CCM (siControl-ASC-CCM) or TSG-6 knockdown ASC-CCM (siTSG-6-ASC-CCM) was delivered intravitreally into both eyes. One month following injection, the ocular function was assessed followed by molecular and immunohistological analysis. In vitro, mouse microglial cells were used to evaluate the anti-inflammatory effect of ASC-CCM. Efficacy of ASC-CCM in normalizing retinal vascular permeability was assessed using trans-endothelial resistance (TER) and VE-cadherin expression in the presence of TNFα (1 ng/ml). RESULTS We show that intravitreal injection of ASC-CCM (siControl-ASC-CCM) but not the TSG-6 knockdown ASC-CCM (siTSG-6-ASC-CCM) mitigates the loss of visual acuity and contrast sensitivity, retinal expression of genes associated with microglial and endothelial activation, and retinal GFAP immunoreactivity at 4 weeks after blast injury. In vitro, siControl-ASC-CCM but not the siTSG-6-ASC-CCM not only suppressed microglial activation and STAT3 phosphorylation but also protected against TNFα-induced endothelial permeability as measured by transendothelial electrical resistance and decreased STAT3 phosphorylation. CONCLUSIONS Our findings suggest that ASCs respond to an inflammatory milieu by secreting higher levels of TSG-6 that mediates the resolution of the inflammatory cascade on multiple cell types and correlates with the therapeutic potency of the ASC-CCM. These results expand our understanding of innate mesenchymal cell function and confirm the importance of considering methods to increase the production of key analytes such as TSG-6 if mesenchymal stem cell secretome-derived biologics are to be developed as a treatment solution against the traumatic effects of blast injuries and other neurovascular inflammatory conditions of the retina.
Collapse
Affiliation(s)
- Kumar Abhiram Jha
- Department of Ophthalmology, University of Tennessee Health Science Center, College of Medicine, 930 Madison Ave, Suite#768, Memphis, TN, 38163, USA
| | - Mickey Pentecost
- Cell Care Therapeutics, Inc., Los Angeles, CA, USA.,Present Address: Pathways to Stem Cell Science, Monrovia, CA, USA
| | - Raji Lenin
- Department of Ophthalmology, University of Tennessee Health Science Center, College of Medicine, 930 Madison Ave, Suite#768, Memphis, TN, 38163, USA
| | - Jordy Gentry
- Department of Ophthalmology, University of Tennessee Health Science Center, College of Medicine, 930 Madison Ave, Suite#768, Memphis, TN, 38163, USA
| | - Lada Klaic
- Cell Care Therapeutics, Inc., Los Angeles, CA, USA
| | - Nobel Del Mar
- Department of Anatomy and Neurobiology, University of Tennessee Health Science Center, College of Medicine, 855 Monroe Avenue, Suite#515, Memphis, TN, 38163, USA
| | - Anton Reiner
- Department of Anatomy and Neurobiology, University of Tennessee Health Science Center, College of Medicine, 855 Monroe Avenue, Suite#515, Memphis, TN, 38163, USA
| | - Chuan He Yang
- Department of Pathology, University of Tennessee Health Science Center, College of Medicine, 19 South Manassas Street, Suite#214, Memphis, TN, 38163, USA
| | - Lawrence M Pfeffer
- Department of Pathology, University of Tennessee Health Science Center, College of Medicine, 19 South Manassas Street, Suite#214, Memphis, TN, 38163, USA
| | - Nicolas Sohl
- Cell Care Therapeutics, Inc., Los Angeles, CA, USA
| | - Rajashekhar Gangaraju
- Department of Ophthalmology, University of Tennessee Health Science Center, College of Medicine, 930 Madison Ave, Suite#768, Memphis, TN, 38163, USA. .,Department of Anatomy and Neurobiology, University of Tennessee Health Science Center, College of Medicine, 855 Monroe Avenue, Suite#515, Memphis, TN, 38163, USA.
| |
Collapse
|