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Gerhart, J.; George-Weinstein, M. Myo/Nog Cells in the Lens. Encyclopedia. Available online: https://encyclopedia.pub/entry/46819 (accessed on 27 July 2024).
Gerhart J, George-Weinstein M. Myo/Nog Cells in the Lens. Encyclopedia. Available at: https://encyclopedia.pub/entry/46819. Accessed July 27, 2024.
Gerhart, Jacquelyn, Mindy George-Weinstein. "Myo/Nog Cells in the Lens" Encyclopedia, https://encyclopedia.pub/entry/46819 (accessed July 27, 2024).
Gerhart, J., & George-Weinstein, M. (2023, July 14). Myo/Nog Cells in the Lens. In Encyclopedia. https://encyclopedia.pub/entry/46819
Gerhart, Jacquelyn and Mindy George-Weinstein. "Myo/Nog Cells in the Lens." Encyclopedia. Web. 14 July, 2023.
Myo/Nog Cells in the Lens
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This entry is adapted from the peer-reviewed paper 10.3390/cells12131725

Myo/Nog cells, discovered by their expression of the skeletal muscle specific transcription factor MyoD, bone morphogenetic protein inhibitor Noggin, and brain specific angiogenesis inhibitor 1, are integrated into the eye during early stages of embryonic development. While their release of Noggin is critical normal eye morphogenesis, wounding may stimulate Myo/Nog cells to form contractile myofibroblasts that cause secondary cataracts and retinal detachment.

Myo/Nog MyoD Noggin BAI1 myofibroblasts fibrosis lens

1. Discovery of Myo/Nog Cells in the Embryo

Myo/Nog cells were discovered during the search for the origin of the skeletal muscle lineage, which at the time, was reported to occur in the embryonic somites under the influence of factors released by surrounding tissues [1][2][3][4]. A few outliers to this well documented induction of cell fate demonstrated that the tissues which give rise to the somites, including epiblast, contain cells that differentiate into skeletal muscle in culture, even when grown in serum-free medium [5][6][7][8]. In vivo, approximately 14 cells were detected in the epiblast of the chick embryo blastocyst and 70 cells by the onset of gastrulation that expressed mRNA for the skeletal muscle-specific transcription factor MyoD (Figure 1B) [9] that, along with other members of its family, regulate the specification of cells to the skeletal muscle lineage [10][11][12].
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Figure 1. Cells that co-express MyoD, Noggin and BAI1 in the embryonic epiblast differentiate into skeletal muscle in vitro. In situ hybridization and immunofluorescence localization revealed a small population of cells that co-expressed BAI1 (green) and MyoD mRNA (red) (B) and Noggin protein (red) (C) in the posterior/medial epiblast of chick embryos before the onset of gastrulation (red box in A). Nuclei are stained with Hoechst dye (blue). Labeling with the skeletal muscle-specific 12,101 mAb demonstrated that BAI1-positive Myo/Nog cells isolated from the epiblast differentiated into skeletal myofibers when cultured in serum-free medium (D). BAI1-negative epiblast cells were labeled with a mAb to cardiac muscle-specific troponin T (E). Addition of Noggin to the medium resulted in the synthesis of the 12,101 antigen in BAI1-negative cells (F). Bar = 13 µM.
Fortuitously, a monoclonal antibody (mAb) researchers generated against mesoderm cells, named G8, specifically bound to cells with MyoD mRNA in the epiblast (Figure 1B) and fetal organs lacking skeletal muscle [13][14][15]. The antigen recognized by the G8 mAb was later identified as brain-specific angiogenesis inhibitor 1 (BAI1) [16], a member of the adhesion G protein-coupled receptor family [17][18]. Functions of BAI1 include, among others, inhibition of angiogenesis, mediation of myocyte fusion to form multinucleated myofibers and phagocytosis [17][18][19][20][21][22][23][24]. The G8 epitope lies within the third thrombospondin repeat of BAI1′s extracellular domain [16], thereby enabling the use of the G8 mAb to isolate, track and target MyoD-positive (+) cells.
BAI1+/MyoD+ cells isolated from the chick embryo epiblast with the G8 mAb differentiated into skeletal muscle and fused to form multinucleated myofibers with sarcomeres when cultured in serum-free medium [14] (Figure 1D). BAI1-negative (−) cells differentiated predominantly into cardiac muscle (Figure 1E) unless they were cultured in medium conditioned by BAI1+ cells in which they underwent skeletal myogenesis [14]. Researchers speculated that the factor(s) released by the BAI1+ cells in vitro was related to the mechanism regulating myogenesis in the somites involving inhibition of bone morphogenetic protein (BMP) signaling via Noggin [25][26][27][28]. This hypothesis was validated when skeletal myogenesis was induced in BAI1- cultures by substituting BAI1+ cell-conditioned medium with Noggin [14] (Figure 1F). Noggin mRNA and protein were then localized exclusively in epiblast cells that expressed MyoD and BAI1 in vivo (Figure 1C). The triple-positive cells were named Myo/Nog to reflect their capacity to differentiate into skeletal muscle and release Noggin.
The anti-BAI1 G8 mAb was also used to track Myo/Nog cells from the chick embryo epiblast into all three germ layers and their derivatives [29][30][31]. Only a subpopulation of cells in the somites co-expressed BAI1 and Noggin [29], suggesting that Myo/Nog cells are a separate lineage from myogenic cells induced within the mesoderm. BAI1+ epiblast cells were also tracked into the pre-lens placode and lens vesicle, and later were localized in the equatorial and germinative zones, anterior epithelium and between the primary fiber cells [31] (Figure 2A–D). BAI1+ cells continue to express MyoD and Noggin in the lens (Figure 2E,F) and other non-skeletal muscle tissues in the embryo and fetus. Myo/Nog cells were tracked into the heart and brain, and those present in the fetal intestine differentiated into skeletal muscle in culture [13][30]. These studies demonstrated Myo/Nog cells’ stable commitment to the skeletal muscle lineage and capacity for regulating BMP signaling regardless of their environment.
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Figure 2. Epiblast-derived Myo/Nog cells are integrated into the developing lens. Myo/Nog cells were fluorescently labeled with the BAI1 mAb in the epiblast and the embryos were incubated for 1–3 days. Sections were stained with Hoechst dye to label nuclei (blue). In the stage 7 embryo, Myo/Nog cells were found in the pre-lens placode (boxed area in (A) shown at high magnification in (B)). A stage 17 eye is shown in (C). The area within the red box is shown at higher magnification in (D,E). The white box delineates the enlargement in (F). Prelabeled Myo/Nog cells were found in the equatorial zone (EZ) of the lens (D) and among the differentiating primary lens fiber cells (arrow in (D)). BAI1+ and Noggin+ cells (green) co-expressed MyoD mRNA (red) throughout the lens (E,F). Overlap of green and red appears yellow in merged images. Bar = 135 µM in (A), 13 µM in (B) and (D–F) and 56 µM in (C).

2. Roles of Myo/Nog Cells in the Developing Embryo

The functions of Myo/Nog cells during development were revealed in a series of experiments in which they were eliminated in the chick embryo epiblast by lysing them with the anti-BAI1 G8 mAb and complement [29][31][32]. Once depleted, Myo/Nog cells did not reappear in the embryo and Noggin was not detected in other cell types. The absence of Myo/Nog cells resulted in an expansion of BMP signaling and severe malformations of the ventral body wall, central nervous system and eyes (Figure 3C,D), an absence of skeletal muscle and expansion of cardiac muscle [29][31][32]. These defects phenocopied to a large extent Noggin null mice [33][34][35][36][37][38]. Eye malformations ranged from anophthalmia to lens dysgenesis and overgrowth of the retina [29][31] (Figure 3C,D). Treatment with the G8 mAb or complement alone did not impair eye development (not shown). Replacing Myo/Nog cells with beads soaked in Noggin prevented ocular defects and other malformations (Figure 3E,F) and restored skeletal muscle differentiation in the somites [29][31]. Thus, Myo/Nog cells’ release of Noggin is indispensable for normal development, including eye morphogenesis.
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Figure 3. Myo/Nog cells are required for normal eye development and migrate to wounds in the embryo. Myo/Nog cells were eliminated in the chick embryo epiblast by incubating the embryo in the BAI1 mAb and complement. Embryos were incubated for approximately 5 days. Some embryos received beads soaked in Noggin (Nog) a day after treatment. A normal PBS control embryo (CT) and an H&E-stained section of the eye are shown in (A,B). Depletion of Myo/Nog cells resulted in malformations of the body wall and eyes, including microphthalmia (arrow in (C)) and dysgenesis of the lens and retina (D). Addition of Noggin-soaked beads prevented malformations caused by Myo/Nog cell depletion (E,F). Embryos treated with the D4 mAb and complement to eliminate a separate population of cells in the central epiblast (blue box in (G)) stimulated the migration of BAI1-labeled Myo/Nog cells (green) from the posterior/medial epiblast (red box in (G)) to TUNEL+ cells (red) (H). The direction of migration is indicated by the arrow in H. A puncture wound was produced in the day-1 chick embryo lateral to the primitive streak (boxed area in (I)). BAI1+ cells (red) surrounded the wound (J). BAI1+ (green) cells containing MyoD mRNA (red) were present in niches in explants of fetal chick lens tissue (arrows in (K)). Within two days after plating, BAI1+/MyoD mRNA+ cells had migrated to the cut edge of the tissue (arrow in (L)). Bar = 5 mM in (A,C), 56 µM in (B,D), 2.5 mM in (E), 41 µM in (F) and 13 µM in (H–L).
Noggin binds to BMPs -2, -4 and -7 and prevents receptor binding [39][40]. Knockout of BMPs, exogenous or overexpressed Noggin have been used as tools to define the roles of BMPs during lens development [41]. BMPs -2, -4 and -7 are important for the specification of the ectoderm to the lens epithelial cell lineage, formation and invagination of the lens placode and lens fiber cell differentiation [42][43][44][45][46][47][48][49][50][51][52]. Although BMPs are required for eye development, the intensity of their signaling must be regulated [53][54][55]. Researchers' studies illustrate that Myo/Nog cells’ release of Noggin is a physiological mechanism that titrates the effects of BMPs in the lens and this is accomplished with a small number of cells [31].
Another role for Myo/Nog cells was revealed in a control experiment in which a separate subpopulation of cells in the central epiblast was depleted using the D4 mAb and complement [32]. Elimination of D4+ cells reduced the size of the embryo but the eyes appeared normal. Lysis of D4+ cells stimulated a rapid increase in the number of Myo/Nog cells and their migration from the posterior/medial epiblast to dying cells in the central epiblast [32] (Figure 3G,H).
Myo/Nog cells also rapidly accumulate around puncture wounds in the embryo (Figure 3J) and incisions made in the fetal lens to produce capsular bag cultures [56][57][58] (Figure 3L). BAI1+/MyoD mRNA+ cells were initially present in niches in the lens explants [59] (Figure 3K). Tracking the cells with the anti-BAI1 G8 mAb demonstrated their rapid migration to the cut edges of the tissue (Figure 3L) and synthesis of MyoD protein and alpha-smooth muscle actin (α-SMA) [59], a marker of vascular smooth muscle cells and myofibroblasts [60]. Lysis of Myo/Nog cells with the G8 mAb and complement prevented the emergence of α-SMA+ cells [59]. These studies of embryonic and fetal chick tissues revealed that Myo/Nog cells home to dying cells and wounds. Myo/Nog cells’ response to injury in an adult mammalian lens and retina will be described below.

3. Myo/Nog Cells in the Adult Eye

The next phase of the exploration of Myo/Nog cells involved characterizing their behaviors in normal and diseased tissues of adult mammals. Similar to the chick embryo, Myo/Nog cells are present in low numbers in all adult tissues and organs analyzed thus far, from mice to humans [16][61][62][63][64][65][66][67][68][69][70]. Within the eye, Myo/Nog cells are residents of the lens, cornea, ciliary body, retina and choroid [16][62][63][66][67][68][70][71][72] (Figure 4). They also are present on the zonules of Zinn migrating towards the lens from the ciliary body [64] (Figure 4F). In the adult lens, Myo/Nog cells are associated with LECs in the equatorial, bow and anterior regions and are present but rare among the fiber cells [62][64][66][68] (Figure 4B,C).
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Figure 4. Myo/Nog cells are present throughout the adult mouse eye. Sections of the adult mouse eye were stained with H&E (A) or double-labeled with antibodies to BAI1 (red) and Noggin (B–F,H) or fibrillin (green) (G). The overlap of red and green appears yellow in merged images. Nuclei were stained with Hoechst dye (blue). Arrows point to Myo/Nog cells in the equatorial (B) and bow regions (C) of the lens, the endothelial layer of the cornea (D), ciliary body (CB) (E) and on the zonules of Zinn (arrows in (F,G)). Each layer of the retina contained a small number of Myo/Nog cells (H). Bar = 55 µM in (A), 9 µM in (B–E,G,H) and 6.5 µM in (F).

Behavior of Myo/Nog Cells in Explant Cultures of Anterior Human Lens Tissue

The behaviors of Myo/Nog cells in the adult lens were initially studied in serum-free explant cultures of anterior tissue removed from patients undergoing cataract surgery. MyoD+/ Noggin+/BAI1+ cells were associated with the apical surface of LECs [62][71]. They were also found at the cut edge of the tissue and surrounding wounds within the epithelium where they extended processes towards wrinkles in the capsule (Figure 5A–C). Myo/Nog cells synthesized α-SMA, sarcomeric myosin, and skeletal muscle-specific troponin T and T-tubule-associated 12101 protein [62] (Figure 5A–C). Only Noggin+/BAI1+ cells were co-labeled with antibodies to striated muscle proteins [62]. The appearance of MyoD, α-SMA and multiple striated muscle proteins defines the differentiated progeny of Myo/Nog cells as myofibroblasts that were shown decades ago to resemble single-nucleated skeletal myocytes [60][73][74][75][76].
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Figure 5. Myo/Nog cells are the source of myofibroblasts and phagocytose dead cells in human anterior lens explant cultures. Anterior lens tissue was obtained from patients undergoing cataract surgery and cultured in serum-free medium. Myo/Nog cells double-labeled with antibodies to BAI1 (red) and Noggin, α-SMA and skeletal muscle-specific troponin T (green) surrounded wounds in the epithelium (A–C) and extended processes towards wrinkles in the capsule (arrow in (A)). They also migrated onto the capsule and synthesized α-SMA after producing a scratch wound in 2-day cultures (E). Cells filling the scratch wound in the presence of Myo/Nog cells are shown in the phase contrast photomigraph (F). Myo/Nog cells were depleted with the anti-BAI1 mAb and complement (-M/N) (G–J). Treatment of explants with TGF-β1 after Myo/Nog cell depletion contained α-SMA+/BAI1-cells (D). Scratch wounds contained fewer cells on the capsule after Myo/Nog cell depletion (G). Incubation with TGF-β2 in the absence of Myo/Nog cells resulted in detachment of most cells from the capsule (H). Addition of Noggin (Nog) to TGF-β2 treated cultures prevented detachment and promoted migration into the wound, but the cells did not express MyoD or α-SMA (I,J). Explants were treated on days 2 and 13 with the BAI1 mAb conjugated to 3DNA nanocarriers intercalated with doxorubicin (BAI1 Ab:3DNA:Dox) (K,M). TUNEL staining revealed apoptotic BAI1+ cells (K). BAI1+/α-SMA+ cells migrated into the scratch wound in 30-day control cultures treated with BAI1 Ab:3DNA lacking doxorubicin (L). BAI1+/Noggin+ were not present in explants treated with BAI1 Ab:3DNA:Dox (M). Anterior lens explants were labeled with lysosensor red dye and then treated with doxorubicin to induce apoptosis. Treated cells were added to untreated explant cultures. BAI1+ cells (green) phagocytosed cells prelabeled with lysosenser dye (red) and killed with doxorubicin (black) (arrow in N). Bar = 9 µM in (A–E,I,K–N), 27 µM in (F–I).
Differentiating Myo/Nog cells rapidly filled in a wound produced by scratching the lens epithelium (Figure 5E,F). Depletion of Myo/Nog cells in human lens explants with the anti-BAI1 G8 mAb and complement reduced the number of cells populating the scratch wound (Figure 5G) and eliminated cells with MyoD and striated myosin throughout the explant in 5-day cultures [62]. Expression of α-SMA was detected in lens epithelial cells (LECs) lacking BAI1 in explants depleted of Myo/Nog cells and treated with transforming growth factor beta 1 (TGF-β1) [62] (Figure 5). TGF-β2, a known inducer of epithelial to mesenchymal transition and expression of α-SMA in the lens [58][77][78][79][80][81][82][83][84][85][86][87][88], was added to explant cultures in an effort to stimulate the migration and transdifferentiation of LECS to myofibroblasts in the absence of Myo/Nog cells. TGF-β2, but not TGF-β1, resulted in the loss of the majority of LECs within 48 h [62] (Figure 5H). Co-addition of Noggin prevented LEC loss, and although the cells filled the wound, they did not synthesize MyoD or sarcomeric myosin [62] (Figure 5I,J). These results suggest that the combination of TGF-β2 and hyperactive BMP signaling is toxic to LECs, and Myo/Nog cells may modulate interactions between the two pathways. Combinatorial effects of these signaling pathways was also revealed in explant cultures of rat LECs in which the addition of BMP-7 suppressed TGF-β2′s induction of an epithelial to mesenchymal transition [89].
The long-term effects of Myo/Nog cell depletion in human lens tissue were explored in 30-day serum-free explant cultures [71]. In these experiments, Myo/Nog cells were depleted with the BAI1 mAb conjugated to 3DNA nanocarriers intercalated with doxorubicin (BAI1 Ab:3DNA:Dox) (Figure 5K). The drug was not toxic to surrounding LECs (Figure 5K). Treatment with BAI1 Ab:3DNA:Dox, but not the conjugate without doxorubicin, on the 1st and 13th days in culture eliminated Myo/Nog cells and myofibroblasts throughout the tissue and within a scratch wound one month after plating (Figure 5L,M). These studies illustrate that Myo/Nog cells are the progenitors of lens myofibroblasts in explants of human anterior lens tissue.

4. Role of Myo/Nog Cells in Posterior Capsule Opacification

A fibrotic wound healing response, called posterior capsule opacification (PCO), occurs in approximately 20% of adults and most children within two years of cataract surgery [90][91][92][93][94][95]. PCO is characterized by the migration of cells and their differentiation to myofibroblasts whose contractions produce vision-impairing wrinkles in the posterior capsule [87][94][96][97]. Researchers injected BAI1 Ab:3DNA:Dox into the rabbit lens during cataract surgery to test whether Myo/Nog cells are progenitors of myofibroblasts that cause PCO in vivo. In this aggressive model of PCO, a minimum of 80% of rabbits developed PCO within one month of surgery [66][98]. The drug dramatically reduced the number of myofibroblasts and wrinkles in the capsule without off-target effects [66] (Figure 6A–D). PCO and peripheral and anterior capsule opacification were reduced to below clinically significant levels [66]. This study established that Myo/Nog cells are the progenitors of myofibroblasts in the lens in vivo and revealed a potential therapeutic approach to preventing PCO. 

Having identified Myo/Nog cells as the progenitors of myofibroblasts in the lens, attention turned to PVR, a fibrotic disease that most often occurs in response to the repair of rhegmatogenous retinal detachment [99][100][101][102][103][104]. PVR is characterized by the formation of membranes on the inner surface of the retina (epiretinal), and/or behind or within the retina [99][100][101]. Myofibroblasts accumulate within the membranes and their contractions apply traction on the retina that may cause re-detachment [99][100][101][105]. In human epiretinal membranes, greater than 99% of cells with α-SMA, MyoD and striated muscle myosin II heavy chain co-expressed BAI1 and Noggin [67] (Figure 6F).

To examine the behavior of Myo/Nog cells during ERM formation, researchers utilized a mouse model in which PVR is induced by injecting SF6 gas and human retinal pigmented epithelial cells (ARPE-19) into the vitreous [106]. This model recapitulates disease progression seen in humans and other species. Myo/Nog cells were present on the inner surface of the retina early in the process of PVR induction and were the predominant cell type in ERMs [70]. They were the only cells that synthesized α-SMA apart from vascular smooth muscle and striated muscle myosin II [70]. Differentiated Myo/Nog cells overlaid retinal folds and areas of detachment (Figure 6G) and were present throughout the retina with disease progression (Figure 6H). Few leukocytes were present in the eye at all stages of PVR, indicating that inflammation did not appear to be a significant factor in Myo/Nog cell activation in this model. However, subpopulations of Myo/Nog cells expressed CD18 and CD45, markers for all leukocytes, and CD68 that is present in cells of the monocyte lineage [70]. It can be concluded that the death of human RPE cells was the likely stimulus for proliferation and migration of Myo/Nog cells and their engulfment of cell corpses [70], as occurs in other tissues, including the lens [68].

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Figure 6. Myo/Nog cells differentiate into myofibroblasts in posterior capsule opacification (PCO) and proliferative vitreoretinopathy (PVR). Rabbit lenses were injected with balanced saline solution (BSS) (A,C) or BAI1 Ab:3DNA:Dox (B,D) during cataract surgery. Lenses were harvested 30 days later and sections were labeled with an antibody to SMA (green) (A–D). SMA and wrinkles (arrow) were abundant in lenses injected with BSS) (A). Depletion of Myo/Nog cells significantly reduced α-SMA+ myofibroblasts and wrinkles in the capsule (B,D). Human epiretinal membranes (ERM) removed from patients with PVR were sectioned and stained with H&E (E) or antibodies to BAI1 (red) and striated muscle myosin (green) (F). Overlap of red and green in merged images appears yellow. Nuclei were labeled with Hoechst dye (blue). Myosin+ myofibroblasts express BAI1 in human epiretinal membranes (F). PVR was induced in the mouse retina by injecting SF6 gas and human ARPE-19 cells into the vitreous. Sections were double labeled with antibodies to BAI1 (red) and α-SMA (green) (G,H). BAI1+ myofibroblasts were present in epiretinal membranes and throughout the retina (G,H) and overlaid areas of detachment (arrow in G). OPL = outer plexiform layer. Bar = 27 µM in (A–D), 9 µM in (E–H) and 135 µM in (G).

Myofibroblasts also appear in other ocular diseases [87]. Myo/Nog cells are present throughout the eye, and therefore, may be a source of myofibroblasts in the cornea, as well as the lens and retina. Behaviors of Myo/Nog cells in glaucoma are also worthy of exploration. Related questions are whether they become activated in response to increased intraocular pressure and if their differentiation and contraction narrow the outflow passages. The phagocytic function of Myo/Nog cells highlights the importance of examining their role in maintaining the patency of the trabecular meshwork and Schlemm’s canal for outflow of the aqueous humor. In the lens, Myo/Nog cells’ appearance among lens fiber cells raises the possibility that they engage in phagocytosis that may be important for maintaining transparency. The relative contributions of Myo/Nog cells, macrophages and microglia to clearance in the eye are likely to vary between tissues and the extent of inflammation. 

The research has identified Myo/Nog cells as sole expressors of BAI1, MyoD and Noggin in the eye, mediators of phagocytosis and the source of myofibroblasts in the lens and retina. Myo/Nog cells are expected to be progenitors of myofibroblasts in other organs such as the heart, lung, kidney and liver whose functions are also compromised by fibrosis. Defining the molecular stimuli that activate Myo/Nog cells and trigger their proliferation, migration and differentiation may lead to additional therapeutic strategies to prevent and treat fibrotic disease. Their roles in regulating BMP signaling, neuroprotection and angiogenesis could also be leveraged for therapeutic purposes.

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Jacquelyn Gerhart
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