1
|
Vaghasiya J, Dalvand A, Sikarwar A, Mangat D, Ragheb M, Kowatsch K, Pandey D, Hosseini SM, Hackett TL, Karimi-Abdolrezaee S, Ravandi A, Pascoe CD, Halayko AJ. Oxidized Phosphatidylcholines Trigger TRPA1 and Ryanodine Receptor-dependent Airway Smooth Muscle Contraction. Am J Respir Cell Mol Biol 2023; 69:649-665. [PMID: 37552547 DOI: 10.1165/rcmb.2022-0457oc] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Accepted: 08/07/2023] [Indexed: 08/10/2023] Open
Abstract
Asthma pathobiology includes oxidative stress that modifies cell membranes and extracellular phospholipids. Oxidized phosphatidylcholines (OxPCs) in lung lavage from allergen-challenged human participants correlate with airway hyperresponsiveness and induce bronchial narrowing in murine thin-cut lung slices. OxPCs activate many signaling pathways, but mechanisms for these responses are unclear. We hypothesize that OxPCs stimulate intracellular free Ca2+ flux to trigger airway smooth muscle contraction. Intracellular Ca2+ flux was assessed in Fura-2-loaded, cultured human airway smooth muscle cells. Oxidized 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine (OxPAPC) induced an approximately threefold increase in 20 kD myosin light chain phosphorylation. This correlated with a rapid peak in intracellular cytoplasmic Ca2+ concentration ([Ca2+]i) (143 nM) and a sustained plateau that included slow oscillations in [Ca2+]i. Sustained [Ca2+]i elevation was ablated in Ca2+-free buffer and by TRPA1 inhibition. Conversely, OxPAPC-induced peak [Ca2+]i was unaffected in Ca2+-free buffer, by TRPA1 inhibition, or by inositol 1,4,5-triphosphate receptor inhibition. Peak [Ca2+]i was ablated by pharmacologic inhibition of ryanodine receptor (RyR) Ca2+ release from the sarcoplasmic reticulum. Inhibiting the upstream RyR activator cyclic adenosine diphosphate ribose with 8-bromo-cyclic adenosine diphosphate ribose was sufficient to abolish OxPAPC-induced cytoplasmic Ca2+ flux. OxPAPC induced ∼15% bronchial narrowing in thin-cut lung slices that could be prevented by pharmacologic inhibition of either TRPA1 or RyR, which similarly inhibited OxPC-induced myosin light chain phosphorylation in cultured human airway smooth muscle cells. In summary, OxPC mediates airway narrowing by triggering TRPA1 and RyR-mediated mobilization of intracellular and extracellular Ca2+ in airway smooth muscle. These data suggest that OxPC in the airways of allergen-challenged subjects and subjects with asthma may contribute to airway hyperresponsiveness.
Collapse
Affiliation(s)
- Jignesh Vaghasiya
- Department of Physiology and Pathophysiology
- Biology of Breathing Group, Children's Research Hospital of Manitoba, Winnipeg, Manitoba, Canada
| | - Azadeh Dalvand
- Department of Physiology and Pathophysiology
- Biology of Breathing Group, Children's Research Hospital of Manitoba, Winnipeg, Manitoba, Canada
| | - Anurag Sikarwar
- Department of Physiology and Pathophysiology
- Biology of Breathing Group, Children's Research Hospital of Manitoba, Winnipeg, Manitoba, Canada
| | - Divleen Mangat
- Biology of Breathing Group, Children's Research Hospital of Manitoba, Winnipeg, Manitoba, Canada
| | - Mirna Ragheb
- Biology of Breathing Group, Children's Research Hospital of Manitoba, Winnipeg, Manitoba, Canada
| | - Katarina Kowatsch
- Biology of Breathing Group, Children's Research Hospital of Manitoba, Winnipeg, Manitoba, Canada
| | - Dheerendra Pandey
- Department of Physiology and Pathophysiology
- Biology of Breathing Group, Children's Research Hospital of Manitoba, Winnipeg, Manitoba, Canada
| | - Seyed Mojtaba Hosseini
- Department of Physiology and Pathophysiology
- Manitoba Multiple Sclerosis Research Center, and
| | - Tillie L Hackett
- Department of Anesthesiology, Pharmacology & Therapeutics, Centre for Heart Lung Innovation, University of British Columbia, Vancouver, British Columbia, Canada; and
| | | | - Amir Ravandi
- Department of Physiology and Pathophysiology
- Department of Internal Medicine, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
- Institute of Cardiovascular Sciences, St. Boniface Hospital Albrechtsen Research Centre, Winnipeg, Manitoba, Canada
| | - Christopher D Pascoe
- Department of Physiology and Pathophysiology
- Biology of Breathing Group, Children's Research Hospital of Manitoba, Winnipeg, Manitoba, Canada
| | - Andrew J Halayko
- Department of Physiology and Pathophysiology
- Department of Internal Medicine, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
- Biology of Breathing Group, Children's Research Hospital of Manitoba, Winnipeg, Manitoba, Canada
| |
Collapse
|
2
|
Gibson MT, Mangat D, Gagliano G, Wilson M, Fletcher J, Bulman J, Newman HN. Evaluation of the efficacy of a redox agent in the treatment of chronic periodontitis. J Clin Periodontol 1994; 21:690-700. [PMID: 7852614 DOI: 10.1111/j.1600-051x.1994.tb00788.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A redox dye, methylene blue, was compared with subgingival root surface debridement and sterile water in the treatment of adult periodontitis. Plaque and gingival indices, bleeding on probing, and microbiological samples were obtained at baseline, and at 1, 4, 8 and 12 weeks following treatment. All subjects had matched pockets in each of the 4 quadrants, of 5 mm or more. One treatment consisted of 0.1% methylene blue gel irrigated professionally at 0, 1 and 4 weeks, and by subjects at days in between up to 4 weeks, at chosen sites within a randomly selected quadrant (split-mouth design). A 2nd treatment was sterile water irrigation as above. A 3rd quadrant received subgingival debridement, and sites in the 4th received methylene blue incorporated into a slow-release device of a biodegradable collagen alginate vicryl composite. All sites showed improvements in clinical and microbiological parameters. However, no statistically significant differences between treatment types were found for clinical measurements. Although plaque index tended to increase after week 1, gingival index was reduced, as was the papilla bleeding index. Probing depth reductions were approximately 1.2 mm for all treatments. Microbiological variables showed an increase in cocci and a decrease in motile organisms for all groups, the latter reaching statistical significance for subgingival debridement. The reductions in spirochaetes were significant for subgingival debridement and methylene blue by slow-release. Culture demonstrated an increase in the aerobe:anaerobe ratio for all groups, which was statistically significant initially (weeks 1 and 4) for subgingival debridement. Methylene blue was also effective statistically in improving this ratio, both by irrigation and slow-release (week 4). Methylene blue also significantly reduced the numbers of black-pigmented anaerobes during the trial period, both by irrigation and slow-release, which sterile water and subgingival debridement failed to do. No serious adverse experiences were seen, however, significantly greater morbidity was associated with subgingival debridement. These results clearly demonstrate that in altering the microflora to one that is more compatible with periodontal health, methylene blue treatment is comparable, or even better, than the currently standard treatment of subgingival debridement, and is better tolerated.
Collapse
Affiliation(s)
- M T Gibson
- Department of Periodontology, Eastman Dental Hospital, London, UK
| | | | | | | | | | | | | |
Collapse
|
3
|
Lindberg RE, Anawis MA, Bailey M, Mangat D, Frank PM, Hrusovsky IG, Hooyman L, Putterman C, Defreese JD. Development of the Abbott MATRIX Aero assay for the measurement of specific IgE. J Immunoassay 1991; 12:465-85. [PMID: 1806584 DOI: 10.1080/01971529108053275] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
An enzyme immunoassay has been developed for the quantitation of specific immunoglobulin E (IgE) in human serum to a panel of allergens. The assay system, called the Abbott MATRIX Aero, includes an instrument, reagents and test cell disposables. Each test cell contains fourteen airborne allergens individually localized on a nitrocellulose solid phase. Individual calibration curves for each allergen are established by the manufacturer and included in barcode form with each test kit. Stable factory calibration eliminates the need to establish a calibration curve with each assay run. The instrument automatically incubates, washes, and reads the test cell and prints each result, which ensures assay reproducibility and provides ease-of-use. Analysis of test results shows good agreement with another in vitro assay for specific IgE. The Abbott MATRIX Aero is a sensitive, reproducible and easy-to-use system for the measurement of specific IgE to a panel of fourteen allergens simultaneously using a single, small volume of serum.
Collapse
|
4
|
Abstract
Surgical correction of the nasal tip is considered to be the most difficult component of rhinoplasty. We describe a systematic method of analyzing and operating on the tip, and discuss the anatomical factors that contribute to tip support. The "tripod" theory of tip projection, support, and rotation is described and illustrated. Altering tip support and excising portions of the lower lateral cartilages have a decided effect on the tripod and the eventual outcome of the nasal tip. We describe four categories of tip procedures, namely, complete strip, rim strip, lateral crural flap, and dome division. An attempt is made to provide the rhinoplasty surgeon with the different techniques from which to choose for each specific type of nasal tip deformity.
Collapse
|
5
|
Mangat D, Orr WC, Smith RO. Sleep apnea, hypersomnolence, and upper airway obstruction secondary to adenotonsillar enlargement. Arch Otolaryngol 1977; 103:383-6. [PMID: 880101 DOI: 10.1001/archotol.1977.00780240041003] [Citation(s) in RCA: 75] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The authors examined four children with substantial adenotonsillar enlargement that caused intermittent severe upper airway obstructive episodes, documented by all-night polygraphic monitoring of sleep and respirations. Previously unreported complications of severe adenotonsillar enlargement that were demonstrated included prolonged obstructive apneic episodes and disturbed sleep patterns. The children also exhibited daytime hypersomnolence. Polygraphic sleep studies after adenotonsillectomy confirmed improved sleep patterns and relief of the obstructive episodes. None of our patienqs had developed pulmonary hypertension, cor pulmonale, or other reported complications of prolonged upper airway obstruction, all of which may have been averted by early diagnosis and treatment.
Collapse
|