Contractile properties of human renal cell carcinoma recruited arteries and their response to nicotinamide

MW Ruddock, DM Burns, Stephanie McKeown, L Murphy, IK WAlsh, PF Keane, DG Hirst

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    Background and purpose: The manipulation of tumour blood supply and thus oxygenation is a potentially important strategy for improving the treatment of solid tumours by radiation. Increased knowledge about the characteristics that distinguish the tumour vasculature from its normal counterparts may enable tumour blood flow to be more selectively modified, Nicotinamide (NA) causes relaxation of preconstricted normal and tumour-supply arteries in rats. It has also been shown to affect microregional blood flow in human tumours. Direct effects of NA on human tumour supply arteries have not previously been reported. This paper describes our evaluation of the effects of NA on two parameters: `spontaneous', oscillatory contractile activity and agonist (phenylephrine)-induced constriction in the arteries supplying human renal cell carcinomas. Materials and methods: Isolated renal cell carcinoma feeder vessels were perfused in an organ bath with the alpha(1)-adrenoceptor agonist phenylephrine (PE). When the arteries had reached a plateau of constriction, nicotinamide (8.2 mM) was added to the perfusate and changes in perfusion pressure were measured. Results: PE (10 mu M) induced a sustained constriction in the majority of the renal cell carcinoma feeder vessels examined, demonstrating that they retain contractile characteristics, at least in response to this alpha(1)-adrenoceptor agonist. In combination with NA (8.2 mM) the constriction was significantly attenuated in half of the preparations. In addition, seven arteries exhibited spontaneous contractile activity which was significantly attenuated by NA in six of them. Conclusions: NA can significantly attenuate both `spontaneous' and agonist-induced constrictions in tumour-recruited human arteries, though not all arteries are sensitive. Published by Elsevier Science Ireland Ltd.
    LanguageEnglish
    Pages179-184
    JournalRadiotherapy and Oncology
    Volume54
    Issue number2
    Publication statusPublished - Feb 2000

    Fingerprint

    Niacinamide
    Renal Cell Carcinoma
    Arteries
    Constriction
    Neoplasms
    Phenylephrine
    Adrenergic Receptors
    Baths
    Ireland
    Perfusion
    Radiation
    Pressure

    Cite this

    Ruddock, MW., Burns, DM., McKeown, S., Murphy, L., WAlsh, IK., Keane, PF., & Hirst, DG. (2000). Contractile properties of human renal cell carcinoma recruited arteries and their response to nicotinamide. Radiotherapy and Oncology, 54(2), 179-184.
    Ruddock, MW ; Burns, DM ; McKeown, Stephanie ; Murphy, L ; WAlsh, IK ; Keane, PF ; Hirst, DG. / Contractile properties of human renal cell carcinoma recruited arteries and their response to nicotinamide. In: Radiotherapy and Oncology. 2000 ; Vol. 54, No. 2. pp. 179-184.
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    abstract = "Background and purpose: The manipulation of tumour blood supply and thus oxygenation is a potentially important strategy for improving the treatment of solid tumours by radiation. Increased knowledge about the characteristics that distinguish the tumour vasculature from its normal counterparts may enable tumour blood flow to be more selectively modified, Nicotinamide (NA) causes relaxation of preconstricted normal and tumour-supply arteries in rats. It has also been shown to affect microregional blood flow in human tumours. Direct effects of NA on human tumour supply arteries have not previously been reported. This paper describes our evaluation of the effects of NA on two parameters: `spontaneous', oscillatory contractile activity and agonist (phenylephrine)-induced constriction in the arteries supplying human renal cell carcinomas. Materials and methods: Isolated renal cell carcinoma feeder vessels were perfused in an organ bath with the alpha(1)-adrenoceptor agonist phenylephrine (PE). When the arteries had reached a plateau of constriction, nicotinamide (8.2 mM) was added to the perfusate and changes in perfusion pressure were measured. Results: PE (10 mu M) induced a sustained constriction in the majority of the renal cell carcinoma feeder vessels examined, demonstrating that they retain contractile characteristics, at least in response to this alpha(1)-adrenoceptor agonist. In combination with NA (8.2 mM) the constriction was significantly attenuated in half of the preparations. In addition, seven arteries exhibited spontaneous contractile activity which was significantly attenuated by NA in six of them. Conclusions: NA can significantly attenuate both `spontaneous' and agonist-induced constrictions in tumour-recruited human arteries, though not all arteries are sensitive. Published by Elsevier Science Ireland Ltd.",
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    Ruddock, MW, Burns, DM, McKeown, S, Murphy, L, WAlsh, IK, Keane, PF & Hirst, DG 2000, 'Contractile properties of human renal cell carcinoma recruited arteries and their response to nicotinamide', Radiotherapy and Oncology, vol. 54, no. 2, pp. 179-184.

    Contractile properties of human renal cell carcinoma recruited arteries and their response to nicotinamide. / Ruddock, MW; Burns, DM; McKeown, Stephanie; Murphy, L; WAlsh, IK; Keane, PF; Hirst, DG.

    In: Radiotherapy and Oncology, Vol. 54, No. 2, 02.2000, p. 179-184.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Contractile properties of human renal cell carcinoma recruited arteries and their response to nicotinamide

    AU - Ruddock, MW

    AU - Burns, DM

    AU - McKeown, Stephanie

    AU - Murphy, L

    AU - WAlsh, IK

    AU - Keane, PF

    AU - Hirst, DG

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    Y1 - 2000/2

    N2 - Background and purpose: The manipulation of tumour blood supply and thus oxygenation is a potentially important strategy for improving the treatment of solid tumours by radiation. Increased knowledge about the characteristics that distinguish the tumour vasculature from its normal counterparts may enable tumour blood flow to be more selectively modified, Nicotinamide (NA) causes relaxation of preconstricted normal and tumour-supply arteries in rats. It has also been shown to affect microregional blood flow in human tumours. Direct effects of NA on human tumour supply arteries have not previously been reported. This paper describes our evaluation of the effects of NA on two parameters: `spontaneous', oscillatory contractile activity and agonist (phenylephrine)-induced constriction in the arteries supplying human renal cell carcinomas. Materials and methods: Isolated renal cell carcinoma feeder vessels were perfused in an organ bath with the alpha(1)-adrenoceptor agonist phenylephrine (PE). When the arteries had reached a plateau of constriction, nicotinamide (8.2 mM) was added to the perfusate and changes in perfusion pressure were measured. Results: PE (10 mu M) induced a sustained constriction in the majority of the renal cell carcinoma feeder vessels examined, demonstrating that they retain contractile characteristics, at least in response to this alpha(1)-adrenoceptor agonist. In combination with NA (8.2 mM) the constriction was significantly attenuated in half of the preparations. In addition, seven arteries exhibited spontaneous contractile activity which was significantly attenuated by NA in six of them. Conclusions: NA can significantly attenuate both `spontaneous' and agonist-induced constrictions in tumour-recruited human arteries, though not all arteries are sensitive. Published by Elsevier Science Ireland Ltd.

    AB - Background and purpose: The manipulation of tumour blood supply and thus oxygenation is a potentially important strategy for improving the treatment of solid tumours by radiation. Increased knowledge about the characteristics that distinguish the tumour vasculature from its normal counterparts may enable tumour blood flow to be more selectively modified, Nicotinamide (NA) causes relaxation of preconstricted normal and tumour-supply arteries in rats. It has also been shown to affect microregional blood flow in human tumours. Direct effects of NA on human tumour supply arteries have not previously been reported. This paper describes our evaluation of the effects of NA on two parameters: `spontaneous', oscillatory contractile activity and agonist (phenylephrine)-induced constriction in the arteries supplying human renal cell carcinomas. Materials and methods: Isolated renal cell carcinoma feeder vessels were perfused in an organ bath with the alpha(1)-adrenoceptor agonist phenylephrine (PE). When the arteries had reached a plateau of constriction, nicotinamide (8.2 mM) was added to the perfusate and changes in perfusion pressure were measured. Results: PE (10 mu M) induced a sustained constriction in the majority of the renal cell carcinoma feeder vessels examined, demonstrating that they retain contractile characteristics, at least in response to this alpha(1)-adrenoceptor agonist. In combination with NA (8.2 mM) the constriction was significantly attenuated in half of the preparations. In addition, seven arteries exhibited spontaneous contractile activity which was significantly attenuated by NA in six of them. Conclusions: NA can significantly attenuate both `spontaneous' and agonist-induced constrictions in tumour-recruited human arteries, though not all arteries are sensitive. Published by Elsevier Science Ireland Ltd.

    M3 - Article

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    SP - 179

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    JO - Radiotherapy and Oncology

    T2 - Radiotherapy and Oncology

    JF - Radiotherapy and Oncology

    SN - 0167-8140

    IS - 2

    ER -

    Ruddock MW, Burns DM, McKeown S, Murphy L, WAlsh IK, Keane PF et al. Contractile properties of human renal cell carcinoma recruited arteries and their response to nicotinamide. Radiotherapy and Oncology. 2000 Feb;54(2):179-184.