Motor neuron-derived Thsd7a is essential for zebrafish vascular development via the Notch-dll4 signaling pathway
- Lawrence Yu-Min Liu†1, 2,
- Min-Hsuan Lin†1,
- Zih-Yin Lai1,
- Jie-Peng Jiang1,
- Yi-Ching Huang1,
- Li-En Jao3 and
- Yung-Jen Chuang1Email author
© The Author(s). 2016
Received: 9 April 2015
Accepted: 18 July 2016
Published: 2 August 2016
Development of neural and vascular systems displays astonishing similarities among vertebrates. This parallelism is under a precise control of complex guidance signals and neurovascular interactions. Previously, our group identified a highly conserved neural protein called thrombospondin type I domain containing 7A (THSD7A). Soluble THSD7A promoted and guided endothelial cell migration, tube formation and sprouting. In addition, we showed that thsd7a could be detected in the nervous system and was required for intersegmental vessels (ISV) patterning during zebrafish development. However, the exact origin of THSD7A and its effect on neurovascular interaction remains unclear.
In this study, we discovered that zebrafish thsd7a was expressed in the primary motor neurons. Knockdown of Thsd7a disrupted normal primary motor neuron formation and ISV sprouting in the Tg(kdr:EGFP/mnx1:TagRFP) double transgenic zebrafish. Interestingly, we found that Thsd7a morphants displayed distinct phenotypes that are very similar to the loss of Notch-delta like 4 (dll4) signaling. Transcript profiling further revealed that expression levels of notch1b and its downstream targets, vegfr2/3 and nrarpb, were down-regulated in the Thsd7a morphants. These data supported that zebrafish Thsd7a could regulate angiogenic sprouting via Notch-dll4 signaling during development.
Our results suggested that motor neuron-derived Thsd7a plays a significant role in neurovascular interactions. Thsd7a could regulate ISV angiogenesis via Notch-dll4 signaling. Thus, Thsd7a is a potent angioneurin involved in the development of both neural and vascular systems.
Development of neural and vascular systems displays high similarity and this congruence is precisely regulated by complex neurovascular interactions and common guidance cues. The blood vessels supply nutrients, oxygen and growth factors to stimulate the proliferation and differentiation of neural cells. Concurrently, the neural cells provide guidance cues to direct endothelial cells to migrate and expand toward the neural tissues in need [1, 2]. There have been reports indicating that neurogenesis occurs prior to angiogenesis in order for the developing neurons to acquire nutrition to sustain growth [3–5]. Signal molecules such as ephrins, semaphorins, slits, and netrins [6–8] that have dual functions on guiding neurogenesis and angiogenesis are thus named “angioneurins” . These angioneurins regulate vascular and nervous differentiation, proliferation, survival and migration during development.
In our previous study, we found a novel conserved protein, Thrombospondin type-I domain containing 7a (THSD7A), is highly expressed in human placental vasculature and umbilical vein endothelial cells (HUVECs). Overexpression of THSD7A in HUVECs inhibits directed cell migration and tube formation, while suppression of THSD7A generates the opposite effects. A soluble form of THSD7A increases the number of new vessel branching points, promotes HUVECs migration and tube formation during angiogenesis via a FAK-dependent mechanism . Moreover, we observed that zebrafish ortholog of THSD7A transcript is detected in the central nervous system along the ventral edge of neural tube and on the growth path of intersegmental vessels (ISV). MO knockdown of Thsd7a disrupts the ISVs patterning in zebrafish embryos. Collectively, our previous findings suggest that zebrafish Thsd7a is a novel angioneurin candidate derived from neuron cells to regulate angiogenesis [10–12]. In the present study, we further confirmed the expression of Thsd7a in primary motor neurons by generating a transgenic Tg(thsd7a:GFP) zebrafish line and characterized Thsd7a’s essential function in neurovascular interactions. The possible signal pathways involved in Thsd7a-mediated angiogenesis and motor neuron development were also explored and investigated.
Construction of the thsd7a-GFP BAC transgenic zebrafish
thsd7a-GFP transgenic zebrafish was created by using bacterial artificial chromosome (BAC) homologous recombination. The thsd7a-containing BAC clone was purchased commercially (Plasmid HUKGB735L10208Q, Source BioScience). First, thsd7a BAC plasmid was extracted from overnight culture cell broth by Midiprep kit (Invitrogen, Carlsbad, CA). The extracted BAC was transformed into EL250 competent cells by electroporation and the flip recombinase activity was induced by 42 °C incubation, BAC-contained EL250 competent cells were selected with chloramphenicol antibiotic. Secondly, specific forward primer was designed by adding 45 base pairs of gene specific sequence together with the green fluorescent protein (GFP) forward primer, and 45 bp of gene specific sequence together with the anti-kanamycin reverse primer. We used a PCR long tailing method to make the GFP-Km DNA cassette for insertion of GFP into the thsd7a BAC clone. After homologous recombination, the first exon of thsd7a was partially replaced with GFP, resulting in the thsd7a-GFP construct driven by the thsd7a regulatory elements in the BAC clone. The construct was then microinjected into zebrafish embryos at one to two cell stages to generate stable lines.
Morpholino microinjection and mRNA rescue
Morpholino phosphorodiamidate oligonucleotides (morpholino, MO) were synthesized by Gene Tools (Philomath, OR) to target splice junctions of the zebrafish thsd7a gene. The MO sequences were as follows: MO1, 5′-TGTATGTTTTTACCCACCATGACTG-3′; 5-base mismatch control for MO1 (msMO1), 5′-TCTATCTTTTTAGCCACGATGAGTG-3′; MO2, 5′-GTGCCA GTTTTGTTACCGTCTTTGC-3′; 5-base mismatch control for MO2 (msMO2), 5′-GTCCCACTTTTCTTACGGTCTTTCC-3′. The injection dosage used is 2 ng of MO1 and 9 ng of MO2 to each embryo. Thsd7a mRNA was synthesized using the mMESSAGE mMACHINE system (Ambion, Autstin, TX) with SP6 RNA polymerase. Murine Notch gene homolog 1 (Notch1) was cloned downstream of the CMV promoter in the pTCN vector (BC138442; constructed by transOMIC. Huntsville, AL). Co-injection of MO1 with 0.4 ng of thsd7a mRNA or 12.5 pg of notch1 construct into zebrafish embryos were performed at one-cell stage of development.
Whole-mount in situ hybridization
Embryos were fixed in 4 % paraformaldehyde overnight at 4 °C and washed by 1X phosphate buffered saline tween-20 (PBST). They were then treated with protease K for 25 min and refixed in 4 % paraformaldehyde for 20 min at room temperature. The embryos were soaked in hybridization buffer (Hyb) at 65 °C for 3 h before the specific probe was added to the embryos in Hyb buffer overnight at 65 °C. The embryos were then washed with 75 % Hyb/25 % 2X SSC, 50 % Hyb50 %/2X SSC, and 25 % Hyb/75 % 2X SSC each at 65 °C for 10 min, then in 0.2X SSC twice for 1 h. After blocking with 2 % bovine serum albumin and goat serum in maleic acid buffer at room temperature for 3 h, AP-conjugated anti-DIG antibody was added into the blocking buffer overnight at 4 °C. The embryos were washed with maleic acid buffer four times at room temperature for 30 min, before they were treated with the NBT/BCIP substrate (Roche, Basel, Switzerland) to react at room temperature for 3 h. Images were taken by using a stereomicroscope (SMZ1500; Nikon, Kanagawa, Japan) equipped with a CCD camera (DS-Fi1; Nikon, Kanagawa, Japan) and Imagepro plus AMS software (Media Cybernetics, Bethesda, MD).
Embryos were fixed in 4 % paraformaldehyde overnight at 4 °C followed by washing with 1X PBST 10 min for 3 times at room temperature, and then permeabilized with ice cold acetone 30 min at 4 °C. After washing with maleic acid buffer (containing 150 mM maleic acid, 100 mM NaCl, pH7.5) 3 times, 10 min each, embryos were blocked with the blocking reagent (containing 2 % goat serum and 2 % BSA in malice acid buffer) for two hours at room temperature. The primary antibody was then added to the blocking reagent and incubated at 4 °C overnight. Finally, embryos were washed with maleic acid buffer 4 times, 30 min each followed by adding appropriate secondary antibody and incubating for 2 h at room temperature. After embryos were washed with maleic acid buffer 4 times, 30 min each again, the embryos were mounted and imaged by a confocal microscope (A1R; Nikon, Kanagawa, Japan). The rabbit anti-EGFP antibody was from Novus and used in 1:600 dilution. The mouse anti-zebrafish Znp-1 antibody was from Zebrafish International Resource Center and used in 1:50 dilution. The goat anti-rabbit IgG Dylight 488 and goat anti-mouse IgG Dylight 549 antibodies were all from Jackson and used in 1:400 dilution.
Real time-quantitative PCR analysis
RNA samples were extracted at 48 h post fertilization (hpf) for morpholino-injected and non-injected zebrafish embryos. cDNA was synthesized by using Transcriptor First Strand cDNA Synthesis kit (Roche, Basel, Switzerland). The specific transcripts of zebrafish were amplified by PCR (Primer sequences are listed in Additional file 1: Table S1). The RT-qPCR reaction was performed using SYBR Green Master Mix (Applied Biosystems, Carlsbad, CA) according to the manufacturer’s instructions and data were analyzed using ABI 7500 System SDS Software. All RT-qPCR products were cloned into the pCRII-TOPO vector (Invitrogen, Carlsbad, CA) and sequenced directly.
Student’s t-test (with two-tailed distribution and unequal variance) was performed in Microsoft Excel to test for differences between two sample populations.
Expression of Zebrafish thsd7a in primary motor neurons
Generation of thsd7a:GFP transgenic zebrafish
Zebrafish Thsd7a is essential for angiogenesis and motor neuron formation
Thsd7a knockdown affected Notch1b expression
Previously, we found that knockdown of Thsd7a caused a delay in ISV growth in zebrafish embryos. Upon close examination, we found that the endothelial tip cells on the angiogenic ISV displayed multiple filopodia expansions, arranged in fan-shape morphology, which is a sign of outgrowth disorientation during angiogenic pathfinding (Additional file 4: Figure S3). These abnormalities might cause the angiogenic sprouts to form aberrant connection to adjacent vessels in ISV, SIV and CtA networks. Together, these phenotypes are very similar to the phenotypes observed under the loss of Notch-dll4 signaling pathway [16–18].
Notch-dll4 signaling pathway plays an important role in mediating the tip and stalk cell induction at the angiogenic spout [19, 20]. Notch1b is an isoform of notch receptor in zebrafish that works with dll4 to regulate the proliferation and migration of intersomitic vessel endothelial cells . It has been shown that notch1b is a crucial receptor in the stalk cell of angiogenic sprout, which acts to communicate with the tip cells through dll4 . Knockdown of notch1b results in hyper-branching of ISV during angiogenesis .
Phenotype frequencies of ISV defects in embryos at 48 hpfa
Normal ISV (%)
Aberrant ISV (%)
Notch1-induced deformity (%)
Total live embryos (experiment repeats)
67 ± 14
33 ± 15
0 ± 0
25 ± 1
75 ± 2
0 ± 0
2 ng/12.5 pg
36 ± 1
59 ± 4
5 ± 3
Furthermore, in the embryonic heart of Thsd7a morphants, we observed apparent ectopic expression of notch1b throughout the heart tube, whereas notch1b expression in the heart of the control morphants had a preferential expression in the AV canal (Fig. 5c, c’). Thsd7a morphant heart displayed significant looping defect and malformation of the AV cancal (data not shown). These data are in agreement with a previous report that notch1b is involved in the specification of central cardiac conduction tissue .
Taken together, our data strongly suggested that loss of Thsd7a expression would reduce the expression level and disrupt the expression pattern of notch1b. This misregulation of notch1b expression would lead to the malformation of the AV canal and significant vascular anomaly with hyper-branching of SIV, CtA and ISV in developing zebrafish.
Thsd7a knockdown affected the expressions of endothelial tip and stalk cell markers
Discussion and conclusion
Our present study showed that zebrafish Thsd7a is a motor neuron-derived protein essential for both neurogenesis and angiogenesis during zebrafish embryonic development. Using the a transgenic reporter approach, we observed that thsd7a expression was co-localized with the expression of motor neurons in the central nervous system, including the midbrain, hindbrain, cerebellum, telencephalon and spinal cord. In situ hybridization assays also demonstrated that thsd7a was expressed in the primary motor neurons. Loss-of-function analysis of Thsd7a also revealed that Thsd7a plays a critical role in maintaining the fan-shape morphology of the endothelial tip cells of the intersegment vessels and that Thsd7a is required for the outgrowth of motor neuron axons. In addition, Thsd7a is also required for the formation of the parachordal chain (PAC), the precursors of the zebrafish lymphatic vessels that share the same growth path of the RoP axons.
Angioneurins are either secreted or transmembrane proteins, and exert their function by regulating the adhesion, differentiation, survival, proliferation and migration of principal component cells of the vascular and nervous systems [8, 27, 28]. In our previous study , we reported that THSD7A contains several thrombospondin type 1 repeats (TSRs) that have been shown to be a potent regulator of angiogenesis in vivo. Interestingly, some of the angioneurins with TSRs are also shown to be expressed in the developing nervous system . Human THSD7A is a membrane-associated N-glycoprotein with a possible soluble form, which could be released into the extracellular space. Consequently, the secreted form of THSD7A can promote endothelial cell migration during angiogenesis and increase the number of new vessel branching points. This is consistent with the finding that knocking down of Thsd7a leads to a delayed growth of intersegmental vessels and abnormal branching in zebrafish embryos, which can be partially rescued by thsd7a mRNA and transplantation of wild-type cells . Taken together, our study suggests that zebrafish Thsd7a is a novel angioneurin derived from motor neurons. It plays critical roles in guiding the neurovascular development, as the roles of other angioneurins such as slit, semaphorins, ephrins, and netrins .
A recent study has identified THSD7A as an autoantigen involved in adult idiopahtic membranous nephropathy . THSD7A is found to be expressed in podocytes, rather than in glomerular endothelial cells, and likely forms an in situ immune complex, resulting in THSD7A-associated membranous nephropathy. This finding coincides with our data in zebrafish that Thsd7a is expressed in perivascular cells that regulate angiogenesis. Podocytes are known to mediate glomerular endothelial cell angiogenesis via VEGF-A and Ang-1 pathways . However, whether Thsd7a functions as an angiogenic factor during human glomerular development is yet to be studied. In addition, it is unclear if circulating soluble Thsd7a is present as our previous data suggest in these patients.
In the present study, we found Thsd7a could influence tip cell pathfinding in addition to vascular patterning. Vegfr2 and Vegfr3 were significantly down-regulated when Thsd7a was knocked down. The loss of Vegfr2 and Vegfr3 could prevent the endothelial tip cells from receiving VEGF signals and disrupt the endothelial cell pathfinding during angiogenesis, which is consistent with our observation that the tip cells adapted a fan-shape morphology and were trapped in the early stage of migration process. As a result, the tip cells extended pseudopodia to make contact with adjacent vessels and formed hyper-branching among the angiogenic vessels, likely because the tip cells of the affected angiogenic vessels failed to sense the growth factors in the immediate microenvironment. Moreover, Vegfc/Vegfr3 signaling is also important in maintainance of motor neurons and alignment of axonal growth with dorsal aorta . Similar observations are also noted when the Netrin/Unc5 pathway is perturbed in a previous zebrafish-based study . It is noteworthy that both Thsd7a and Netrin1a are involved in the FAK signaling pathway . Netrin attracts motor neuron axons, which subsequently direct endothelial cell migration and PAC formation. However, the potential role of Thsd7a in the Netrin1a signaling pathway awaits further investigation.
Notch signaling pathway has been implicated in the regulation of both angiogenesis and neurogenesis. We observed that the level of Notch1b was significantly downregulated in the Thsd7a morphants. This downregulation of Notch1b level likely contributes to the abnormal sprouting and branching during angiogenesis. In the absence of Notch downstream signaling factors, zebrafish embryos display excessive filopodia activity during angiogenesis, marked by increased tip cell numbers and enhanced endothelial cell migration at the angiogenic sprouts . This is similar to what we observed in the Thsd7a morphants, which displayed unrestrained filopodia activity in endothelial tip cells as well. We also showed that Notch1b was expressed in the hindbrain and spinal cord of zebrafish embryo, supporting the role of Notch signaling during central nervous system development. Previous zebrafish studies reported that Notch signaling is required to maintain proliferative neural precursors and regulate neuronal differentiation [35, 36]. Significantly, this notch1b expression was lost upon Thsd7a knockdown.
In conclusion, we have provided new evidence to support the notion that Thsd7a is a potent angioneurin with a critical role in regulating not only angiogenesis, but also motor neuron development. We suggest that Thsd7a functions through interactions with the Notch-dll4 signaling in neurovascular interactions. Understanding how Thsd7a influences the development of vascular and nervous systems will greatly expand our knowledge on the neurovascular interaction and will shed lights on novel therapeutic means to treat diseases linked to the dysfunction of these two parallel systems.
BAC, bacterial artificial chromosome; CaP, caudal primary motoneuron; CtA, central artery; Dll4, delta like 4; HMS, horizontal myoseptum; Hpf, hours post fertilization; HUVEC, human umbilical vein endothelial cells; Hyb, hybridization buffer; ISH, In situ hybridization; ISV, intersegmental vessels; MiP, middle primary motoneuron; MO, morpholino; NICD, notch intracellular domain; PAC, parachordal chain; PBST, phosphate buffered saline tween-20; RoP, rostral primary motoneuron; RTq-PCR, real time-quantitative PCR analysis; SIV, subintestinal vessels; SSC, sodium citrate buffer; THSD7A, thrombospondin type I domain containing 7A
We thank the Taiwan Zebrafish Core facility at NTHU and NHRI for providing critical experimental materials and instrumentation support for this study.
LYL and MHL discussed the study design and wrote the manuscript, both authors contributed equally to this study. JPJ and YCH generated the transgenic fish and carried out the experiments. LEJ and ZYL participated in the study design and helped to draft the manuscript. YJC conceived of the study and helped in manuscript writing. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
Ethics approval and consent to participate
All of the zebrafish-use protocols in this research have been reviewed and approved by the Institutional Animal Care and Use Committee of National Tsing Hua University (IRB Approval NO.09507).
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