How Life Builds Its Plumbing: Blood Vessels vs Plant Veins
A fertilised egg has no vessels, yet embryos and leaves end up with branching networks of pipes. This video follows the chain of causes: Murray's law as the target, oxygen starvation and VEGF in animals, auxin canalization and programmed cell death in plants. It ends on what they share: local rules, feedback and flow. Draft: check the facts against FACT-CHECK.md and references.md before publishing.
Made with Eureka, a Nebulytic product. Illustrations are AI-generated and schematic; check the facts in the sources before relying on them.
Made with Eureka, a Nebulytic product.
The question
How does a single fertilised cell, with no blueprint of pipes, grow a branching tree of plumbing, and why do animals and plants end up with the same branching rule even though one builds with moving cells and the other with cells that cannot move?
Chapters
- 0:00Hook: one cell, no pipes
- 0:27Murray's law: the cheapest way to branch
- 1:23Why an embryo needs vessels
- 2:08First tubes: vasculogenesis
- 2:44Sprouting: tip and stalk cells
- 3:44Joining up: anastomosis
- 4:13Flow sculpts the network
- 5:10Plants cannot move cells
- 5:55Auxin carves the vein channel
- 6:55One strand, two pipelines
- 7:45Two kinds of pipes, one rule
Sources
- Status: [V] title/authors/year/journal confirmed by the research pass; [A] seen as abstract or secondary description only; [U] still to be verified by author before publishing. No images from outside sources were used; all drawings are original vector art made for this video.
- Murray CD (1926). The physiological principle of minimum work: I. The vascular system and the cost of blood volume. Proc Natl Acad Sci USA 12(3):207-214. [V]
- McCulloh KA, Sperry JS, Adler FR (2003). Water transport in plants obeys Murray's law. Nature 421:939-942. [A]
- Critical review of Murray's theory (arXiv 1812.09706). Authors and year to be verified by author. [A]
- Carmeliet P et al. (1996). Abnormal blood vessel development and lethality in embryos lacking a single VEGF allele. Nature 380:435-439. [V]
- Ferrara N et al. (1996). Heterozygous embryonic lethality induced by targeted inactivation of the VEGF gene. Nature 380:439-442. [V]
- Iyer NV et al. (1998). Cellular and developmental control of O2 homeostasis by hypoxia-inducible factor 1 alpha. Genes Dev 12:149-162. [U] (HIF-1a knockout phenotype)
- Gerhardt H et al. (2003). VEGF guides angiogenic sprouting utilizing endothelial tip cell filopodia. J Cell Biol 161(6):1163-1177. [V]
- Hellstrom M et al. (2007). Dll4 signalling through Notch1 regulates formation of tip cells during angiogenesis. Nature 445:776-780. [V]
- Jakobsson L et al. (2010). Endothelial cells dynamically compete for the tip cell position during angiogenic sprouting. Nat Cell Biol 12(10):943-953. [V]
- Fantin A et al. (2010). Tissue macrophages act as cellular chaperones for vascular anastomosis downstream of VEGF-mediated endothelial tip cell induction. Blood 116(5):829-840. [V]
- Wang HU, Chen ZF, Anderson DJ (1998). Molecular distinction and angiogenic interaction between embryonic arteries and veins revealed by ephrin-B2 and its receptor Eph-B4. Cell 93:741-753. [A]
- Gerety SS, Wang HU, Chen ZF, Anderson DJ (1999). Symmetrical mutant phenotypes of the receptor EphB4 and its specific transmembrane ligand ephrin-B2 in cardiovascular development. Mol Cell 4:403-414. [A]
- Tzima E et al. (2005). A mechanosensory complex that mediates the endothelial cell response to fluid shear stress. Nature 437:426-431. [V]
- Ranade SS et al. (2014). Piezo1, a mechanically activated ion channel, is required for vascular development in mice. Proc Natl Acad Sci USA 111(28):10347-10352. [V]
- Li J et al. (2014). Piezo1 integration of vascular architecture with physiological force. Nature 515:279-282. [A; pages to be verified]
- Lucitti JL et al. (2007). Vascular remodeling of the mouse yolk sac requires hemodynamic force. Development 134:3317-3326. [A; pages to be verified]
- Franco CA et al. (2016). Non-canonical Wnt signalling modulates the endothelial shear stress flow sensor in vascular remodelling. eLife 5:e07727. [V]
- Franco CA et al. (2015). Dynamic endothelial cell rearrangements drive developmental vessel regression. PLoS Biol. [A]
- Reviews of vasculogenesis signals (FGF2, BMP4, Ihh, KDR): PMC2634331; Patel-Hett S, D'Amore PA (2011) Int J Dev Biol. Titles to be verified by author. [A]
- Oxygen diffusion reach of about 100-200 um: teaching slides (Imperial College, angiogenesis lecture). Weak source; a primary review is to be found by author. [A]
- PDGF-B smooth-muscle recruitment and the detailed lumen mechanisms: to be verified by author. [U]
- Sachs T (1981). The control of the patterned differentiation of vascular tissues. Adv Bot Res 9:151-262. [A]
- Mitchison GJ (1980). A model for vein formation in higher plants. Proc R Soc Lond B 207:79-109. [A]
- Sauer M et al. (2006). Canalization of auxin flow by Aux/IAA-ARF-dependent feedback regulation of PIN polarity. Genes Dev 20(20):2902-2911. [V]
- Scarpella E, Marcos D, Friml J, Berleth T (2006). Control of leaf vascular patterning by polar auxin transport. Genes Dev 20(8):1015-1027. [V]
- Donner TJ, Sherr I, Scarpella E (2009). Regulation of preprocambial cell state acquisition by auxin signaling in Arabidopsis leaves. Development 136. [U] (MP>ATHB8)
- Schlereth A et al. (2010). MONOPTEROS controls embryonic root initiation by regulating a mobile transcription factor. Nature 464:913-916. [V]
- De Rybel B et al. (2013). A bHLH complex controls embryonic vascular tissue establishment and indeterminate growth in Arabidopsis. Dev Cell 24(4):426-437. [V]
- De Rybel B et al. (2014). Integration of growth and patterning during vascular tissue formation in Arabidopsis. Science 345:1255215. [A]
Illustrations are AI-generated and schematic; real photographs are credited under Image credits. Check the sources before relying on a fact. Shortcuts: space play, j / l back and forward 10 s, < > speed (up to 3x), c captions, f full screen, t theatre, m mute.