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2990 Microsurgery.qxd - O'Brien Institute

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Scientific Research<br />

Bernard O’Brien <strong>Institute</strong> of <strong>Microsurgery</strong><br />

BOBIM SCIENTIFIC REPORT 1997-98<br />

General Introduction<br />

The scientific activities of the <strong>Institute</strong> have<br />

expanded over the last year with several new<br />

projects in:<br />

• angiogenesis,<br />

• tissue engineering,<br />

• ischaemia-reperfusion injury, and<br />

• nerve regeneration<br />

An investigation of the role(s) of nitric oxide, a<br />

gaseous molecule made by blood vessels and<br />

white blood cells, has continued as a major<br />

focus in investigations of cell death following<br />

periods of low blood flow. Recently one of the<br />

enzymes making nitric oxide has been localised<br />

to mast cells, a cell type not previously thought<br />

to play a major role in ischaemic injury to<br />

skeletal muscle.<br />

A new model of angiogenesis (new blood<br />

vessel formation), with relevance to the clinical<br />

situation, has been developed. This model is<br />

being used to identify agents which either<br />

promote or inhibit development of new blood<br />

vessels, with clinical applications in tissue<br />

engineering, vascular disease and cancer.<br />

Further work on leukaemia inhibitory factor (LIF)<br />

has confirmed its muscle preserving action and<br />

shown that the agent is transported from the<br />

site of nerve injury to the muscle by specific<br />

transport down the nerve. This important<br />

finding provides further impetus to the<br />

application of LIF to sites of nerve injury<br />

being repaired by microsurgery.<br />

Our work on macrophage cells continues to<br />

provide us with important new insights into the<br />

molecular mechanisms controlling macrophage<br />

function, and role of these cells in inflammation,<br />

wound repair and blood vessel formation.<br />

The past year has also witnessed several<br />

initiatives involving genetically modified<br />

(transgenic/knockout) mice in which models of<br />

ischaemia-reperfusion injury and angiogenesis<br />

have been created and tested. Such<br />

developments provide a significant technical<br />

challenge for our highly skilled microsurgeons,<br />

but will but enable us to break new ground in<br />

understanding these complex clinical problems.<br />

12

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