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Structure and signaling at hydroid polyp-stolon junctions, revisited.

Harmata KL, Somova EL, Parrin AP, Bross LS, Glockling SL, Blackstone NW - Biol Open (2015)

Bottom Line: Transmission electron microscopy identified mitochondrion-rich cells adjacent to a thick layer of mesoglea at polyp-stolon junctions.The myonemes of these myoepithelial cells extend from the thickened mesoglea to the rigid perisarc on the outside of the colony.The perisarc thus anchors the myoepithelial cells and allows them to pull against the mesoglea and open the lumen of the polyp-stolon junction, while relaxation of these cells closes the lumen.

View Article: PubMed Central - PubMed

Affiliation: Department of Biological Sciences, Northern Illinois University, DeKalb, IL 60115, USA.

No MeSH data available.


Related in: MedlinePlus

Transmission electron micrographs of polyp-stolon junctions of fixed colonies of Podocoryna carnea. (A) A mitochondrion-rich cell (MRC) adjacent to the thickened layer of mesoglea (mg) in the polyp-stolon junction. Scale bar: 1 µm. (B) Several bundles of myonemes (my) from myoepithelial cells are shown within the mesoglea. Note the regular spacing. Scale bar: 2 µm. (C) Two bundles of myonemes from myoepithelial cells are visible. The myonemes on the right extend from the mesoglea to the perisarc (p). Scale bar: 2 µm. (D) Myonemes from a myoepithelial cell extending from the perisarc to the mesoglea. Scale bar: 2 µm.
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BIO012187F6: Transmission electron micrographs of polyp-stolon junctions of fixed colonies of Podocoryna carnea. (A) A mitochondrion-rich cell (MRC) adjacent to the thickened layer of mesoglea (mg) in the polyp-stolon junction. Scale bar: 1 µm. (B) Several bundles of myonemes (my) from myoepithelial cells are shown within the mesoglea. Note the regular spacing. Scale bar: 2 µm. (C) Two bundles of myonemes from myoepithelial cells are visible. The myonemes on the right extend from the mesoglea to the perisarc (p). Scale bar: 2 µm. (D) Myonemes from a myoepithelial cell extending from the perisarc to the mesoglea. Scale bar: 2 µm.

Mentions: Polyp-stolon junctions of colonies of P. carnea were also examined using TEM. As previously, mitochondrion-rich cells adjacent to a thickened layer of mesoglea were observed (Fig. 6A). Bundles of myonemes were observed on the ectodermal side of the thickened mesoglea (Fig. 6B). These myonemes extend from the thickened mesoglea to the rigid perisarc on the outside of the colony (Fig. 6C,D).Fig. 6.


Structure and signaling at hydroid polyp-stolon junctions, revisited.

Harmata KL, Somova EL, Parrin AP, Bross LS, Glockling SL, Blackstone NW - Biol Open (2015)

Transmission electron micrographs of polyp-stolon junctions of fixed colonies of Podocoryna carnea. (A) A mitochondrion-rich cell (MRC) adjacent to the thickened layer of mesoglea (mg) in the polyp-stolon junction. Scale bar: 1 µm. (B) Several bundles of myonemes (my) from myoepithelial cells are shown within the mesoglea. Note the regular spacing. Scale bar: 2 µm. (C) Two bundles of myonemes from myoepithelial cells are visible. The myonemes on the right extend from the mesoglea to the perisarc (p). Scale bar: 2 µm. (D) Myonemes from a myoepithelial cell extending from the perisarc to the mesoglea. Scale bar: 2 µm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4582120&req=5

BIO012187F6: Transmission electron micrographs of polyp-stolon junctions of fixed colonies of Podocoryna carnea. (A) A mitochondrion-rich cell (MRC) adjacent to the thickened layer of mesoglea (mg) in the polyp-stolon junction. Scale bar: 1 µm. (B) Several bundles of myonemes (my) from myoepithelial cells are shown within the mesoglea. Note the regular spacing. Scale bar: 2 µm. (C) Two bundles of myonemes from myoepithelial cells are visible. The myonemes on the right extend from the mesoglea to the perisarc (p). Scale bar: 2 µm. (D) Myonemes from a myoepithelial cell extending from the perisarc to the mesoglea. Scale bar: 2 µm.
Mentions: Polyp-stolon junctions of colonies of P. carnea were also examined using TEM. As previously, mitochondrion-rich cells adjacent to a thickened layer of mesoglea were observed (Fig. 6A). Bundles of myonemes were observed on the ectodermal side of the thickened mesoglea (Fig. 6B). These myonemes extend from the thickened mesoglea to the rigid perisarc on the outside of the colony (Fig. 6C,D).Fig. 6.

Bottom Line: Transmission electron microscopy identified mitochondrion-rich cells adjacent to a thick layer of mesoglea at polyp-stolon junctions.The myonemes of these myoepithelial cells extend from the thickened mesoglea to the rigid perisarc on the outside of the colony.The perisarc thus anchors the myoepithelial cells and allows them to pull against the mesoglea and open the lumen of the polyp-stolon junction, while relaxation of these cells closes the lumen.

View Article: PubMed Central - PubMed

Affiliation: Department of Biological Sciences, Northern Illinois University, DeKalb, IL 60115, USA.

No MeSH data available.


Related in: MedlinePlus