Abstract
A supply of hormone-producing cells from stem/progenitor cells is critical to sustain the endocrine activity of the pituitary gland. In the adenohypophysis composing the anterior and intermediate lobe (AL and IL, respectively), stem/progenitor cells expressing sex-determining region Y-box 2 (SOX2) and S100β are located in the marginal cell layer (MCL) facing Rathke’s cleft (primary niche) and the parenchyma of the AL (secondary niche). Our previous studies using mice and rats indicated that the tetraspanin superfamily CD9 and CD81 are expressed in S100β/SOX2-positive cells of primary and secondary niches (named CD9/CD81/S100β/SOX2-positive cell), and the cells located in the AL-side niches exhibit plasticity and multipotency. However, it is unclear whether CD9/CD81/S100β/SOX2-positive cells in the IL-side primary niche are stem/progenitor cells for the AL or IL. Here, we successfully isolated pure CD9/CD81/S100β/SOX2-positive cells from the IL-side primary niche. They had a higher level of S100β and SOX2 mRNA and a greater pituisphere forming capacity than those of CD9/CD81/S100β/SOX2-positive cells isolated from the AL. They also had capacity to differentiate into all types of adenohypophyseal hormone-producing cells, concomitantly with the loss of CD9 expression. Loss of CD9 and CD81 function in CD9/CD81/S100β/SOX2-positive cells by siRNA treatment impaired prolactin cell differentiation. Consistently, in the pituitary gland of CD9/CD81 double knockout mice, dysgenesis of the MCL and a lower population of prolactin cells were observed. These results suggest that the CD9/CD81/S100β/SOX2-positive cells in the MCL of the IL-side are potential suppliers of adult core stem cells in the AL.
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Acknowledgements
We are grateful to Dr. T. Kato and Y. Kato (Institute for Reproduction and Endocrinology, Meiji University) for helpful discussions. We thank the “Joint Usage/Research Center for Endocrine/Metabolism, Institute for Molecular and Cellular Regulation, Gunma University” (www.imcr.gunma-u.ac.jp/activity/activity3) for providing antibodies.
Funding
This work was supported by JSPS KAKENHI Grants (nos. 19K07255 to K.H. and nos. 17K08517 to K.F.).
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The current study was approved by the Committee on Animal Experiments of the School of Agriculture, Meiji University, and Kyorin University based on the NIH Guidelines for the Care and Use of Laboratory Animals. This article does not contain any studies with human participants. This article does not contain any studies with human participants performed by any of the authors.
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Supplementary file1 (TIF 6011 KB) Supplementary Fig. 1. Differentiation capacity of pituispheres formed using CD9-positive cells of the AL (a) Double immunofluorescence staining for CD9 (red) and SOX2 (green) in the 2nd passage of a pituisphere formed by AL-side CD9-positive cells. (b) DAPI staining (blue) and double immunofluorescence staining for CD9 (red) and pituitary hormones (GH, PRL, LHβ, TSHβ, ACTH) or S100β in a pituisphere (green). (c) Proportions of each hormone-positive cell among pituispheres differentiated from AL-side CD9-positive cells. (d) mRNA levels of the indicated genes in pituispheres of AL-side CD9-positive cells before or after differentiation induction, determined by qPCR (mean ± SEM, n = 6), followed by normalisation with an internal control (Actb): Cd9, Cd81, S100β, Sox2, Pit1, Gh, Prl, Tshβ, LHβ, and Pomc. **P < 0.01. *P < 0.05. Scale bars, 50 μm.
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Supplementary file2 (TIF 8927 KB) Supplementary Fig. 2. Differentiation capacity of pituispheres formed by CD9-positive cells of the AL after Cd9 and Cd81 siRNA treatment. (a) mRNA levels of Cd9, Cd81, S100β, and Sox2 in CD9-positive cells after Cd9 and Cd81 siRNA treatment, determined by qPCR (mean ± SEM, n = 6), followed by normalisation with an internal control (Actb). **P < 0.01. (b) Double immunofluorescence staining for CD9 (red) and CD81 (green) in a pituisphere treated with siRNAs. (c) Bright images of a pituisphere of AL-side CD9-positive cells after siRNA treatment. (d) The number of pituispheres formed by AL-side CD9-positive cells after treatment with non-silencing siRNA and Cd9/Cd81 siRNAs. (e) mRNA levels of Cd9, Cd81, S100β, and Sox2 in pituispheres formed by AL-side CD9-positive cells after siRNA treatment, determined by qPCR (mean ± SEM, n = 6), followed by normalisation with an internal control (Actb). **P < 0.01. (f) Double immunofluorescence staining for PRL and GH in an siRNA-treated pituisphere (left: non-silencing siRNA, right: Cd9/Cd81 siRNA). (g) GH and PRL cell populations after differentiation induction in pituispheres formed by AL-side CD9-positive cells after siRNA treatment. (h) mRNA levels of Sox2, Erα, and Prl in pituispheres formed by AL-side CD9-positive cells after siRNA treatment in the presence/absence of DES, determined by qPCR (mean ± SEM, n = 4), followed by normalisation with an internal control (Actb). **P < 0.01. Scale bars, 50 μm.
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Supplementary file3 (TIF 22201 KB Supplementary Fig. 3. Immunostaining for anterior pituitary hormones in paraffin sections of WT and CD9/CD81 DKO mice. (a and b) 1st panel: HE staining. 2nd–6th panels: Immunostaining for PRL, GH, TSHβ, LHβ, and ACTH in the pituitary of the WT (a) and CD9/CD81 DKO mice (b). Right panels show high magnification of the boxed area in each left panel. (c) Immunofluorescence staining for S100β in paraffin sections of WT (Left panel) and CD9/CD81 DKO mice (Right panel). DAPI staining (blue) and immunofluorescence staining for S100β (green). AL, anterior lobe; IL, intermediate lobe; PL, posterior lobe; RC, Rathke’s cleft; MCL, marginal cell layer. III; third ventricle. Scale bars, 200 μm (a, b, and c, left panels), 20 μm (a and b, right panels).)
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Horiguchi, K., Fujiwara, K., Takeda, Y. et al. CD9-positive cells in the intermediate lobe of the pituitary gland are important supplier for prolactin-producing cells in the anterior lobe. Cell Tissue Res 385, 713–726 (2021). https://doi.org/10.1007/s00441-021-03460-5
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DOI: https://doi.org/10.1007/s00441-021-03460-5