Effects of Adipokines and Insulin on Intracellular pH, Calcium Concentration, and Responses to Hypo-Osmolarity in Human Articular Chondrocytes from Healthy and Osteoarthritic Cartilage
| Autor: | Diego F. López-Zapata, Julio C. Sánchez |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
insulin
obesity medicine.medical_specialty medicine.medical_treatment Intracellular pH Biomedical Engineering Adipokine chemistry.chemical_element Physical Therapy Sports Therapy and Rehabilitation Osteoarthritis Calcium Article Calcium in biology Internal medicine Immunology and Allergy Medicine adipokines calcium Osmotic concentration pH business.industry Insulin medicine.disease osteoarthritis Endocrinology chemistry Calcium concentration business |
| Zdroj: | Cartilage |
| ISSN: | 1947-6043 1947-6035 |
| DOI: | 10.1177/1947603514553095 |
| Popis: | Objective: To evaluate the effects of adipokines and insulin on intracellular calcium concentration ([Ca2+]i) and pH (pHi) in human articular chondrocytes from healthy (CHC) and osteoarthritic cartilage (COC). Design: pHi and [Ca2+]i were measured using BCECF and Fura-2 fluorometric probes in CHC and COC under control conditions and following a hypotonic shock. The effects of interleukin-1β (IL1β), tumor necrosis factor-α (TNFα), insulin, leptin, resistin, and adiponectin were assessed. Results: pHi was lower in COC than in CHC. Only IL1β β decreased pHi in both cell types; all the agents enhanced pHi recovery following an ammonium prepulse in CHC, effect that was attenuated by Na+–H+ exchanger inhibitors, but they had no effect in COC. Hypotonic shock (HTS) caused a pHi increase, which was significantly smaller in COC. All the hormones attenuated this response and the effect of IL1β was greater. The basal [Ca2+]i was similar in COC and CHC; IL1β, TNFα, and insulin increased the [Ca2+]i, but leptin, resistin, and adiponectin did not. These effects were greater in COC. This [Ca2+]i increase was dependent on extracellular Ca2+ and attenuated by Na+–Ca2+ exchanger inhibitors. HTS caused a [Ca2+]i increase, which was inhibited by transient receptor potential vanilloid blockers and attenuated by all the hormones tested with the exception of adiponectin. Conclusions: These findings may help explain the association between obesity and osteoarthritis, in which these hormones are altered. The responses of CHC and COC are different, which suggests that a modification of pH and Ca2+ homeostasis is part of the osteoarthritis pathophysiology. |
| Databáze: | OpenAIRE |
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