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L. Benjamin & E. Keshet

L. Benjamin & E. Keshet. New blood vessel formation (revascularisation/angiogenesis). blood vessel structure (varies between tissues) Cellular mechanisms (capillary sprouting) Angiogenic factors (VEGF, FGF) Anti-angiogenic drugs Applications (disease, tumours, regeneration).

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L. Benjamin & E. Keshet

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  1. L. Benjamin & E. Keshet

  2. New blood vessel formation(revascularisation/angiogenesis) blood vessel structure (varies between tissues) Cellular mechanisms (capillary sprouting) Angiogenic factors (VEGF, FGF) Anti-angiogenic drugs Applications (disease, tumours, regeneration)

  3. New blood vessel formation(revascularisation/angiogenesis) Blood vessel structure Focus on capillaries: structure varies between tissues Endothelial cells Pericytes Smooth muscle cells

  4. Cleaver 6 Melton, 2003

  5. Phenotypes of differentiated endothelial cells Blood brain barrier CNS Lymph nodes High endothelial venules Kidney glomeruli fenestrae Gastrointestinal tract fenestrae liver Large gaps spleen Splenic sinus of red pulp

  6. Ross & Rommel(1995) HISTOLOGY

  7. Ross & Rommel(1995) HISTOLOGY

  8. BLOOD

  9. BLOOD Leukocytes crossing between junctions Dejana E (2006) The transcellular railway: insights into leukocyte diapedesis Nature 8:105-107

  10. Leukocytes penetrating the endothelium Dejana E (2006) The transcellular railway: insights into leukocyte diapedesis Nature 8:105-107

  11. New blood vessel formation(revascularisation/angiogenesis) Blood vessel structure (varies between tissues) Cellular mechanisms(capillary sprouting) Angiogenic factors (VEGF, FGF) Anti-angiogenic drugs Applications (disease, tumours, exercise, regeneration)

  12. New blood vessel formation(revascularisation/angiogenesis) Angiogenic factors VEGF = ONLY mitogenic for endothelial cells FGF = mitogenic for many cell types Angiopoietin GFs, MMPs, Exercise

  13. Capillary sprouting = angiogenesis Folkman J (2007)

  14. Folkman J (2007)

  15. BMDC recruitment in tumors

  16. Angiogenic factors, cytokines initiate recruitment

  17. BMDC mobilization

  18. Transendothelial migration

  19. Homing of BMDCs to tumor

  20. Amplification of hematopoietic lineages

  21. Folkman J (2007)

  22. New blood vessel formation(revascularisation/angiogenesis) Anti-angiogenic drugs

  23. 3 general mechanisms of angiogenesis inhibitors Folkman J (2007)

  24. Anti-angiogenic factors and Genetics e.g. Downs syndrome – increased circulating endostatin (~10 fold higher) results in decreased tumour incidence Extra copy of chromosome 21 = extra copy of collagen 18 endostatin is an integral part of collagen 18 (cleaved fragment)

  25. Putting the Bite on Cancer Q: Is it true that sharks don't get cancer? A: While it is not true that sharks do not develop cancer, they do have a remarkable cancer shield. Of the thousands of fish tumors in the collections of the Smithsonian Institution, only about 15 are from elasmobranchs (The Smithsonian is an amazing place - where else can one go to see thousands of fish tumors?), and only two of these are thought to have been malignant.  Research by Dr. Robert Langer of M.I.T. and other workers has revealed a promising anti-tumor agent obtainable in quantity from shark cartilage. Shark cartilage, it turns out, contains a compound antagonistic to the effects of angiogenin, called 'angiogenin inhibitor' - which does just what it sounds like: inhibits the formation of new blood vessels so that the proto-tumor starves or 'chokes' in its own waste products. The Silky Shark is 'hit' hard by the shark fin and shark cartilage industries - Clincal trials indicate that shark fin extracts are NOT effective at slowing cancers Save the sharks!

  26. Applications of drugs to influence angiogenesis Diseases EYE.Macular degeneration - due to increased/inappropriate blood vessels: capillaries grow into the photoreceptors = block. Curently use VEGF antibody every 4-5 weeks to block (= foreign protein). NEW = Viral delivery of soluble VEGF Receptor into the eye Piroska Rakoczy, Lions Eye Institute, UWA Diabetic retinopathy (Type 1) treat with laser photocoagulation UTERUS.Endometriosis / outside the uterus (increased blood vessels = block) CANCERS.Cancer and tumour growth (requires angiogenesis = block) Dharma, A&HB, patent on anti-angiogenic factors Tissue regeneration (requires angiogenesis = increase) How deliver drugs specifically to target? Recombinant virus?

  27. Angiogenesis = growth of blood vessel sprouts from capillary blood vesselsDepends on angiogenic factors and their inhibitors Angiogenesis is required for growth of many normal tissues– bone, prostate repair of many damaged tissues increase in adipose tissue tumour growth Folkman J (2007) Nature Reviews/ Drug discovery. April 6:273-286

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