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Oscanoa TJ, Cieza EC, Grimaldo O, Andia YB, Lizaraso-Soto FA, Guevara ML, Fujita RM, Romero-Ortuno R. Use of Angiotensin II Receptor Blockers, Angiotensin I-Converting Enzyme Polymorphism and Associations with Memory Performance in Older People. Adv Gerontol 2021. [DOI: 10.1134/s2079057021020107] [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] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Oscanoa TJ, Cieza EC, Lizaraso-Soto FA, Guevara ML, Fujita RM, Parodi JF, Runzer-Colmenares FM, Romero-Ortuno R. Lack of association between angiotensin-converting enzyme genotype and muscle strength in Peruvian older people. Adv Gerontol 2020; 33:686-690. [PMID: 33342098] [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] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Aging can be associated with decreasing muscle strength, and related factors are comorbidities, sex, physical activity, and possibly genetic factors. Among genetic factors the renin-angiotensin system is of interest, but data on the Peruvian population is lacking. The objective of our study was to evaluate the association of grip strength and angiotensin convertase enzyme (ACE) polymorphism in Peruvian older people. A cross-sectional study in a convenience sample of 104 participants over 60 years in Lima, Perú, with analysis of the ACE polymorphism, was performed. We studied 104 participants, 46 men (44,2%) and 58 women (55,8%), with a mean age and standard deviation (SD) of 73,7 (7,4) years, range between 60-90 years. The frequency of D/D, I/D and I/I genotypes was 12,7; 43,7 and 43,7% respectively. The genotype distribution of ACE polymorphism agreed with the Hardy-Weinberg equilibrium (p=0,746). The mean (SD) of grip strength in the D/D, I/D and I/I polymorphisms were 24,8 (7,2); 22,8 (7,2) and 23,4 (7,6) kg respectively; no significant difference was observed (p=0,41) between genetic groups. In this small convenience sample of older Peruvians, no association was found between grip strength and ACE genotype.
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Affiliation(s)
- T J Oscanoa
- Universidad de San Martín de Porres, Facultad de Medicina Humana, Instituto de Investigación, Alameda del Corregidor 1531, La Molina 15024 Lima, Perú, e-mail:
- Geriatric Department, Hospital Almenara, ESSALUD, Av. Grau 800, La Victoria, Lima-13, Lima, Perú
- Universidad Nacional Mayor de San Marcos, Facultad de Medicina, Av. Grau 755 Lima, Peru
| | - E C Cieza
- Geriatric Department, Hospital Almenara, ESSALUD, Av. Grau 800, La Victoria, Lima-13, Lima, Perú
- Universidad Nacional Mayor de San Marcos, Facultad de Medicina, Av. Grau 755 Lima, Peru
| | - F A Lizaraso-Soto
- Universidad de San Martín de Porres, Facultad de Medicina Humana, Instituto de Investigación, Alameda del Corregidor 1531, La Molina 15024 Lima, Perú, e-mail:
| | - M L Guevara
- Universidad de San Martín de Porres, Facultad de Medicina Humana, Instituto de Investigación, Alameda del Corregidor 1531, La Molina 15024 Lima, Perú, e-mail:
| | - R M Fujita
- Universidad de San Martín de Porres, Facultad de Medicina Humana, Instituto de Investigación, Alameda del Corregidor 1531, La Molina 15024 Lima, Perú, e-mail:
| | - J F Parodi
- Universidad de San Martín de Porres, Facultad de Medicina Humana, Instituto de Investigación, Alameda del Corregidor 1531, La Molina 15024 Lima, Perú, e-mail:
| | - F M Runzer-Colmenares
- Universidad de San Martín de Porres, Facultad de Medicina Humana, Instituto de Investigación, Alameda del Corregidor 1531, La Molina 15024 Lima, Perú, e-mail:
- Facultad de Ciencias de la Salud, Carrera de Medicina Humana, Universidad Científica del Sur, Panamericana Sur Km 19, Villa, Lima, Peru
| | - R Romero-Ortuno
- Discipline of Medical Gerontology, Mercer's Institute for Successful Ageing, St James's Hospital, Dublin, Ireland, James's Street, Dublin 8, Ireland
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Waltz DA, Fujita RM, Yang X, Natkin L, Zhuo S, Gerard CJ, Rosenberg S, Chapman HA. Nonproteolytic role for the urokinase receptor in cellular migration in vivo. Am J Respir Cell Mol Biol 2000; 22:316-22. [PMID: 10696068 DOI: 10.1165/ajrcmb.22.3.3713] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.0] [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] [Indexed: 01/21/2023] Open
Abstract
The urokinase receptor (uPAR) binds and localizes urokinase activity at cellular surfaces, facilitating fibrinolysis and cellular migration at sites of tissue injury. uPAR also participates in cellular signaling and regulates integrin-dependent adhesion and migration in vitro. We now report evidence that uPAR occupancy regulates cellular migration in vivo in the absence of functional urokinase. Recombinant murine KC (1.5 microg), a potent neutrophil chemoattractant, was delivered to the lungs of wild-type, urokinase-deficient or uPAR-deficient mice 18 h after intraperitoneal injection of 200 microg human immunoglobulin G (IgG) or a fusion protein composed of an amino-terminal receptor-binding fragment of urokinase and a human IgG Fc fragment (GFD-Fc). Whole lung lavage for recovery of leukocytes was performed 4 h later. KC treatment resulted in a 100-fold increase in lavage neutrophils. GFD-Fc injection resulted in >50% reduction in neutrophil influx in both wild-type and urokinase-deficient animals but had no effect on uPAR -/- mice. A concomitant reduction in alveolar protein leakage but no change in numbers of circulating neutrophils accompanied this attenuated inflammatory response. The reduction in neutrophil influx induced by GFD-Fc is thus related to uPAR occupancy and yet not due to disruption of uPAR-mediated proteolysis. These observations verify that protease-independent functions of uPAR operate in vivo and identify uPAR as a potential target for regulation of inflammatory processes characterized by neutrophil-mediated injury.
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Affiliation(s)
- D A Waltz
- Department of Medicine, Children's Hospital, Boston, Massachusetts 02115, USA.
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Bonilla FA, Fujita RM, Pivniouk VI, Chan AC, Geha RS. Adapter proteins SLP-76 and BLNK both are expressed by murine macrophages and are linked to signaling via Fcgamma receptors I and II/III. Proc Natl Acad Sci U S A 2000; 97:1725-30. [PMID: 10677525 PMCID: PMC26503 DOI: 10.1073/pnas.040543597] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.2] [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] [Indexed: 11/18/2022] Open
Abstract
The SLP-76 (Src homology 2 domain-containing leukocyte protein of 76 kDa) adapter protein is expressed in T cells and myeloid cells, whereas its homologue BLNK (B cell linker protein) is expressed in B cells. SLP-76 and BLNK link immunoreceptor tyrosine-based activation motif-containing receptors to signaling molecules that include phospholipase C-gamma, mitogen-activated protein kinases, and the GTPases Ras and Rho. SLP-76 plays a critical role in T cell receptor, FcvarepsilonRI and gpVI collagen receptor signaling, and participates in signaling via FcgammaR and killer cell inhibitory receptors. BLNK plays a critical role in B cell receptor signaling. We show that murine bone marrow-derived macrophages express both SLP-76 and BLNK. Selective ligation of FcgammaRI and FcgammaRII/III resulted in tyrosine phosphorylation of both SLP-76 and BLNK. SLP-76(-/-) bone marrow-derived macrophages display FcgammaR-mediated tyrosine phosphorylation of Syk, phospholipase C-gamma2, and extracellular signal regulated kinases 1 and 2, and normal FcgammaR-dependent phagocytosis. These data suggest that both SLP-76 and BLNK are coupled to FcgammaR signaling in murine macrophages.
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Affiliation(s)
- F A Bonilla
- Division of Immunology, Children's Hospital, and Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA
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Waltz DA, Natkin LR, Fujita RM, Wei Y, Chapman HA. Plasmin and plasminogen activator inhibitor type 1 promote cellular motility by regulating the interaction between the urokinase receptor and vitronectin. J Clin Invest 1997; 100:58-67. [PMID: 9202057 PMCID: PMC508165 DOI: 10.1172/jci119521] [Citation(s) in RCA: 214] [Impact Index Per Article: 7.9] [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] [Indexed: 02/04/2023] Open
Abstract
The urokinase receptor (uPAR) coordinates plasmin-mediated cell-surface proteolysis and promotes cellular adhesion via a binding site for vitronectin on uPAR. Because vitronectin also binds plasminogen activator inhibitor type 1 (PAI-1), and plasmin cleavage of vitronectin reduces PAI-1 binding, we explored the effects of plasmin and PAI-1 on the interaction between uPAR and vitronectin. PAI-1 blocked cellular binding of and adhesion to vitronectin by over 80% (IC50 approximately 5 nM), promoted detachment of uPAR-bearing cells from vitronectin, and increased cellular migration on vitronectin. Limited cleavage of vitronectin by plasmin also abolished cellular binding and adhesion and induced cellular detachment. A series of peptides surrounding a plasmin cleavage site (arginine 361) near the carboxy-terminal end of vitronectin were synthesized. Two peptides spanning res 364-380 blocked binding of uPAR to vitronectin (IC50 approximately 8-25 microM) identifying this region as an important site of uPAR-vitronectin interaction. These data illuminate a complex regulatory scheme for uPAR-dependent cellular adhesion to vitronectin: Active urokinase promotes adhesion and also subsequent detachment through activation of plasmin or complex formation with PAI-1. Excess PAI-1 may also promote migration by blocking cellular adhesion and/or promoting detachment, possibly accounting in part for the strong correlation between PAI-1 expression and tumor cell metastasis.
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Affiliation(s)
- D A Waltz
- Division of Respiratory Diseases, Children's Hospital, Brigham and Women's Hospital, and Harvard Medical School, Boston, Massachusetts 02115, USA.
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