LINDA BROMLEY’s research while affiliated with University of Oxford and other places

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Publications (8)


The Collagen Changes of Dupuytren’s Contracture
  • Article

September 1991

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62 Reads

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64 Citations

Journal of Hand Surgery (European Volume)

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M.J.O. Francis

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LINDA BROMLEY

In Dupuytren's contracture there is an increase in the ratio of type III to type I collagen. The objective of this study was to determine if fibroblasts from patients with Dupuytren's contracture have an intrinsic aberration in collagen production or whether local factors govern the collagen changes in Dupuytren's contracture. Using a new collagen micro-method, we found that fibroblasts cultured from palmar fascia affected by Dupuytren's contracture produced similar collagen to fibroblasts derived from the palmar fascia of age- and sex-matched patients with carpal tunnel syndrome. Furthermore, the collagen changes of Dupuytren's contracture could be reproduced in all cell lines by increasing fibroblast density. At high fibroblast density, type I collagen production was inhibited: a finding that could account for the increased types III/I collagen ratio in Dupuytren's contracture. These results suggest that a genetic defect in collagen production is unlikely and that the important phenomenon is an increase in fibroblast density.


Murrell GAC, Francis MJO & Bromley L. Modulation of fibroblast proliferation by oxygen free radicals. Biochem J265: 659-665

March 1990

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39 Reads

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444 Citations

Biochemical Journal

The major unexplained phenomenon in fibrotic conditions is an increase in replicating fibroblasts. In this report we present evidence that oxygen free radicals can both stimulate and inhibit proliferation of cultured human fibroblasts, and that fibroblasts themselves release superoxide (O2.-) free radicals. Fibroblasts released O2.- in concentrations which stimulated proliferation, a finding confirmed by a dose-dependent inhibition of proliferation by free radical scavengers. Oxygen free radicals released by a host of agents may thus provide a very fast, specific and sensitive trigger for fibroblast proliferation. Prolonged stimulation may result in fibrosis, and agents which inhibit free radical release may have a role in the prevention of fibrosis.


Fig. 3. Modulation of fibroblast proliferation of oxygen free radicals The results of two separate experiments are drawn on the same axes for comparison. On the right, exogenous free radicals have been introduced by the addition of increasing concentrations of xanthine oxidase (XO) to medium containing 1 mM-hypoxanthine. The control (D2) contained 10-2 units of xanthine oxidase/ml which had been heatdenatured at 100 °C for 15 min. The mean thymidine incorporation into the control group was 13 pmol/106 cells. On the left, no radical-generating systems have been added, and endogenous O23-or H202 have been scavenged by superoxide dismutase (SOD) and catalase (Cat) respectively. The control (D1) contained 250 units of heatdenatured Cat/ml and 60 ,tg of heat-denatured SOD/ml. The mean thymidine incorporation in the control group was 53 pmol/ 106 cells. Results are expressed as percentages
Modulation of fibroblast proliferation by oxygen free radicals
  • Article
  • Full-text available

February 1990

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114 Reads

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609 Citations

Biochemical Journal

The major unexplained phenomenon in fibrotic conditions is an increase in replicating fibroblasts. In this report we present evidence that oxygen free radicals can both stimulate and inhibit proliferation of cultured human fibroblasts, and that fibroblasts themselves release superoxide (O2.-) free radicals. Fibroblasts released O2.- in concentrations which stimulated proliferation, a finding confirmed by a dose-dependent inhibition of proliferation by free radical scavengers. Oxygen free radicals released by a host of agents may thus provide a very fast, specific and sensitive trigger for fibroblast proliferation. Prolonged stimulation may result in fibrosis, and agents which inhibit free radical release may have a role in the prevention of fibrosis.

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Free radicals and Dupuytren's contracture

December 1987

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221 Reads

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60 Citations

British Medical Journal (Clinical research ed.)

The concentration of substrate expressed as hypoxanthine capable of reacting with xanthine oxidase to release superoxide free radicals (O2-) was measured in control and Dupuytren's contracture palmar fascia. In Dupuytren's contracture palmar fascia the concentration of hypoxanthine was six times that of control and was greatest in "nodular" areas. Xanthine oxidase activity was also detected in Dupuytren's contracture palmar fascia. These results suggest a greater potential for hypoxanthine-xanthine oxidase generated oxygen free radical formation in Dupuytren's contracture than in control palmar fascia. Production of free radicals may be an important factor in the pathogenesis of Dupuytren's contracture. The benefit of allopurinol in the management of Dupuytren's contracture and other fibrotic conditions may thus be explained, as allopurinol binds to xanthine oxidase and prevents release of free radicals.

Citations (7)


... However, treatment with SAHA for an extended period (more than It has been demonstrated that low levels of oxygen free radicals can stimulate the proliferation of human fibroblasts. 39 Lung fibroblasts isolated from patients with IPF also showed increased production of mitochondrial ROS, which contributed to the senescence of these pathological cells and may be associated with their resistance to apoptosis. 40 Our results also suggest that TGFβ can induce a slight increase in mitochondrial ROS. ...

Reference:

SAHA inhibits lung fibroblast activation by increasing p66Shc expression epigenetically
Modulation of fibroblast proliferation by oxygen free radicals

Biochemical Journal

... Agents such as steroids and non-steroidal antiinflammatory drugs inhibit the enzymes in this cascade, and may inhibit the effects of free radicals. This may be why Dupuytren's contracture is seen less frequently in patients with rheumatoid arthritis (27,31). ...

Cyclo-oxygenase and oxygen free radical-stimulated fibroblast proliferation

Biochemical Society Transactions

... Subsequently, low levels of O 2 −• and H 2 O 2 proved to activate the proliferation of both hamster [146] and human [147] fibroblasts in culture. From these initial data, several experimental pieces of evidence have suggested that ROS, other than acting as insulinactivated second messengers and stimulating cell proliferation in different cell types [148], also regulate a wide range of physiological functions. ...

Oxygen free radicals stimulate fibroblast proliferation

Biochemical Society Transactions

... [6][7][8] In addition, superoxide anions released by fibroblasts have been suggested to play a role in cellular or subcellular function. [9][10][11] Excessive oxidant damage is prevented in the body by various enzymatic and non-enzymatic antioxidant defense systems such as superoxide dismutase, catalase, glutathione peroxidase, glutathione S-transferase, uric acid, ascorbic acid, ceruplasmin, glutathione, etc. 2,3,12,13 If the de-fense system is unable to cope with the insulting radicals, the unreacted radicals may react with the cellular components, leading ultimately to the peroxidation of membrane lipids, enzyme deactivation, damage of DNA bases, and cell death. 4,14,15 For this reason, it is important to protect the body from excessive radical damage. ...

Fibroblasts release superoxide free radicals

Biochemical Society Transactions

... Уже на початку ХХ століття G. Langemak робив спроби «розчинити» стовщену фасцію за допомогою різних речовин, включаючи пепсин, трипсин, гіалуронідазу [10]. Також у різний час пропонувалися ін'єкції колхіцину [11], алопуринолу [12], кортикостероїдів [13], простагландинів, блокаторів кальцієвих каналів [14]. Однак з огляду на те, що дія цих речовин дає короткочасний ефект, їх використання не знайшло застосування. ...

The Collagen Changes of Dupuytren’s Contracture
  • Citing Article
  • September 1991

Journal of Hand Surgery (European Volume)

... 3,10,19 One strategy to suppress tumour growth is to intervene in cancer-TME communication with antioxidants. 5 N-Acetyl cysteine (NAC), catalase and superoxide dismutase (SOD), have been found to lower ROS levels in fibroblasts, to modulate their proliferation [20][21][22] and inhibit their differentiation. 23 Antioxidants can block the fibroblast "efferent" pathway whereby the cancer cells trigger a reactive response in the stroma by releasing factors that favour cancer progression. ...

Murrell GAC, Francis MJO & Bromley L. Modulation of fibroblast proliferation by oxygen free radicals. Biochem J265: 659-665
  • Citing Article
  • March 1990

Biochemical Journal

... Study showed that increased level of hypoxanthine and xanthin oxidase are found in the palmar fascia of patients with Dupuytren disease. 19 The condition of high free radical level trigger the production of several proinflammatory cytokines including, interleukin-6 (IL-6), IL-1, IL-8, tumour necrosis factor (TNF), transforming growth factor-beta (TGF-β), and many other cytokines. 18,20 Other environmental factors and comorbidities that may also accountable as the additional risk factors associated with the disease are trauma, HIV, epilepsy, and cancer. ...

Free radicals and Dupuytren's contracture

British Medical Journal (Clinical research ed.)