1
|
Abstract
The aging kidney undergoes structural and functional alterations which make it more susceptible to drug-induced acute kidney injury (AKI). Previous studies in our lab have shown that the expression of α(E)-catenin is decreased in aged kidney and loss of α(E)-catenin potentiates AKI-induced apoptosis, but not necrosis, in renal tubular epithelial cells (NRK-52E cells). However, the specific apoptotic pathway underlying the increased AKI-induced cell death is not yet understood. In this study, cells were challenged with nephrotoxicant cisplatin to induce AKI. A ~5.5-fold increase in Fas expression in C2 (stable α(E)-catenin knockdown) relative to NT3 (non-targeted control) cells was seen. Increased caspase-8 and -9 activation was induced by cisplatin in C2 as compared to NT3 cells. In addition, decreased Bcl-2 expression and increased BID cleavage and cytochrome C release were detected in C2 cells after cisplatin challenge. Treating the cells with cisplatin, in combination with a Bcl-2 inhibitor, decreased the viability of NT3 cells to the same level as C2 cells after cisplatin. Furthermore, caspase-3/-7 activation is blocked by Fas, caspase-8, caspase-9 and pan-caspase inhibitors. These inhibitors also completely abolished the difference in viability between NT3 and C2 cells in response to cisplatin. These results demonstrate a Fas-mediated apoptotic signaling pathway that is enhanced by the age-dependent loss of α(E)-catenin in renal tubule epithelial cells.
Collapse
Affiliation(s)
- Xinhui Wang
- Medical Pharmacology and Physiology, School of Medicine, University of Missouri, MA 415 Medical Sciences Building, One Hospital Drive, Columbia, MO, 65212, USA
| | | |
Collapse
|
2
|
Ceja-Fdez A, López-Luke T, Oliva J, Vivero-Escoto J, Gonzalez-Yebra AL, Rojas RAR, Martínez-Pérez A, de la Rosa E. Labeling of HeLa cells using ZrO2:Yb(3+)-Er(3+) nanoparticles with upconversion emission. JOURNAL OF BIOMEDICAL OPTICS 2015; 20:046006. [PMID: 25879389 DOI: 10.1117/1.jbo.20.4.046006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Accepted: 03/16/2015] [Indexed: 06/04/2023]
Abstract
This work reports the synthesis, structural characterization, and optical properties of ZrO2:Yb(3+)-Er(3+) (2–1 mol%) nanocrystals. The nanoparticles were coated with 3-aminopropyl triethoxysilane (APTES) and further modified with biomolecules, such as Biotin-Anti-rabbit (mouse IgG) and rabbit antibody-AntiKi-67, through a conjugation method. The conjugation was successfully confirmed by Fourier transform infrared, zeta potential, and dynamic light scattering. The internalization of the conjugated nanoparticles in human cervical cancer (HeLa) cells was followed by two-photon confocal microscopy. The ZrO2:Yb(3+)-Er(3+) nanocrystals exhibited strong red emission under 970-nm excitation. Moreover, the luminescence change due to the addition of APTES molecules and biomolecules on the nanocrystals was also studied. These results demonstrate that ZrO2:Yb(3+)-Er(3+) nanocrystals can be successfully functionalized with biomolecules to develop platforms for biolabeling and bioimaging.
Collapse
Affiliation(s)
- Andrea Ceja-Fdez
- Centro de Investigaciones en Óptica, A.C., Loma del Bosque 115, Lomas del Campestre, CP 37150, León, Guanajuato, México
| | - Tzarara López-Luke
- Centro de Investigaciones en Óptica, A.C., Loma del Bosque 115, Lomas del Campestre, CP 37150, León, Guanajuato, México
| | - Jorge Oliva
- Centro de Investigaciones en Óptica, A.C., Loma del Bosque 115, Lomas del Campestre, CP 37150, León, Guanajuato, México
| | - Juan Vivero-Escoto
- University of North Carolina at Charlotte, Department of Chemistry, 9201 University City Boulevard, Charlotte, North Carolina 28223, United States
| | - Ana Lilia Gonzalez-Yebra
- Universidad de Guanajuato Campus León, Departamento de Medicina y Nutrición, División Ciencias de la Salud, Boulevard Puente Milenio 1001, Predio San Carlos, CP 37670, León, Guanajuato, México
| | - Ruben A Rodriguez Rojas
- Universidad de Guadalajara, Centro Universitario de los Lagos, Paseos de la Montaña, CP 47460, Lagos de Moreno, Jalisco, México
| | - Andrea Martínez-Pérez
- Centro de Investigaciones en Óptica, A.C., Loma del Bosque 115, Lomas del Campestre, CP 37150, León, Guanajuato, MéxicodUniversidad de Guadalajara, Centro Universitario de los Lagos, Paseos de la Montaña, CP 47460, Lagos de Moreno, Jalisco, México
| | - Elder de la Rosa
- Centro de Investigaciones en Óptica, A.C., Loma del Bosque 115, Lomas del Campestre, CP 37150, León, Guanajuato, México
| |
Collapse
|