A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Lymphatic vessels are present in human saccular intracranial aneurysms (2022)

Huuska, N., Netti, E., Lehti, S., Kovanen, P. T., Niemelä, M., & Tulamo, R. (2022). Lymphatic vessels are present in human saccular intracranial aneurysms. Acta Neuropathologica Communications, 10, Article 130. https://doi.org/10.1186/s40478-022-01430-8

JYU-tekijät tai -toimittajat

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: Huuska, Nora; Netti, Eliisa; Lehti, Satu; Kovanen, Petri T.; Niemelä, Mika; Tulamo, Riikka

Lehti tai sarja: Acta Neuropathologica Communications

eISSN: 2051-5960

Julkaisuvuosi: 2022

Ilmestymispäivä: 05.09.2022

Volyymi: 10

Artikkelinumero: 130

Kustantaja: Biomed Central

Julkaisumaa: Britannia

Julkaisun kieli: englanti

DOI: https://doi.org/10.1186/s40478-022-01430-8

Julkaisun avoin saatavuus: Avoimesti saatavilla

Julkaisukanavan avoin saatavuus: Kokonaan avoin julkaisukanava

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/83232

Tiivistelmä

Saccular intracranial aneurysm (sIA) rupture leads to subarachnoid haemorrhage and is preceded by chronic inflammation and atherosclerotic changes of the sIA wall. Increased lymphangiogenesis has been detected in atherosclerotic extracranial arteries and in abdominal aortic aneurysms, but the presence of lymphatic vessels in sIAs has remained unexplored. Here we studied the presence of lymphatic vessels in 36 intraoperatively resected sIAs (16 unruptured and 20 ruptured), using immunohistochemical and immunofluorescence stainings for lymphatic endothelial cell (LEC) markers. Of these LEC-markers, both extracellular and intracellular LYVE-1-, podoplanin-, VEGFR-3-, and Prox1-positive stainings were detected in 83%, 94%, 100%, and 72% of the 36 sIA walls, respectively. Lymphatic vessels were identified as ring-shaped structures positive for one or more of the LEC markers. Of the sIAs, 78% contained lymphatic vessels positive for at least one LEC marker. The presence of LECs and lymphatic vessels were associated with the number of CD68+ and CD163+  cells in the sIA walls, and with the expression of inflammation indicators such as serum amyloid A, myeloperoxidase, and cyclo-oxygenase 2, with the presence of a thrombus, and with the sIA wall rupture. Large areas of VEGFR-3 and α-smooth muscle actin (αSMA) double-positive cells were detected in medial parts of the sIA walls. Also, a few podoplanin and αSMA double-positive cells were discovered. In addition, LYVE-1 and CD68 double-positive cells were detected in the sIA walls and in the thrombus revealing that certain CD68+ macrophages are capable of expressing LEC markers. This study demonstrates for the first time the presence of lymphatic vessels in human sIA walls. Further studies are needed to understand the role of lymphatic vessels in the pathogenesis of sIA.

YSO-asiasanat: aneurysma; kallonsisäinen aneurysma; aivoverenvuoto; biomarkkerit; tulehdus; imusuonisto

Vapaat asiasanat: lymphangiogenesis; lymphatic vessels; saccular intracranial aneurysm; inflammation; cerebral aneurysm

Liittyvät organisaatiot

OKM-raportointi: Kyllä

VIRTA-lähetysvuosi: 2022

JUFO-taso: 1