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Nucleoplasmic Reticulum Formation in Human Endometrial Cells is Steroid Hormone Responsive and Recruits Nascent Components. Int J Mol Sci 2019; 20:ijms20235839. [PMID: 31757079 PMCID: PMC6929123 DOI: 10.3390/ijms20235839] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 11/05/2019] [Accepted: 11/07/2019] [Indexed: 01/09/2023] Open
Abstract
The nuclei of cells may exhibit invaginations of the nuclear envelope under a variety of conditions. These invaginations form a branched network termed the nucleoplasmic reticulum (NR), which may be found in cells in pathological and physiological conditions. While an extensive NR is a hallmark of cellular senescence and shows associations with some cancers, very little is known about the formation of NR in physiological conditions, despite the presence of extensive nuclear invaginations in some cell types such as endometrial cells. Here we show that in these cells the NR is formed in response to reproductive hormones. We demonstrate that oestrogen and progesterone are sufficient to induce NR formation and that this process is reversible without cell division upon removal of the hormonal stimulus. Nascent lamins and phospholipids are incorporated into the invaginations suggesting that there is a dedicated machinery for its formation. The induction of NR in endometrial cells offers a new model to study NR formation and function in physiological conditions.
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Drozdz MM, Vaux DJ. Shared mechanisms in physiological and pathological nucleoplasmic reticulum formation. Nucleus 2017; 8:34-45. [PMID: 27797635 PMCID: PMC5287099 DOI: 10.1080/19491034.2016.1252893] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 10/13/2016] [Accepted: 10/19/2016] [Indexed: 12/14/2022] Open
Abstract
The mammalian nuclear envelope (NE) can develop complex dynamic membrane-bounded invaginations in response to both physiological and pathological stimuli. Since the formation of these nucleoplasmic reticulum (NR) structures can occur during interphase, without mitotic NE breakdown and reassembly, some other mechanism must drive their development. Here we consider models for deformation of the interphase NE, together with the evidence for their potential roles in NR formation.
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Affiliation(s)
| | - David John Vaux
- Sir William Dunn School of Pathology, University of Oxford, Oxford, UK
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Nejat EJ, Szmyga MJ, Zapantis G, Meier UT. Progesterone Threshold Determines Nucleolar Channel System Formation in Human Endometrium. Reprod Sci 2014; 21:915-920. [PMID: 24458483 DOI: 10.1177/1933719113519177] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Nucleolar channel systems (NCSs), micron-sized organelles specific to nuclei of human endometrial epithelial cells (EECs), are robust markers of the midluteal phase under the apparent control of progesterone. To gain further insight into the role of progesterone in NCS formation, we quantitatively assessed their sensitivity to oral contraceptive pills (OCPs) using immunofluorescence-based detection of NCSs. Comparison of endometrial biopsies and serum progesterone levels on cycle day (CD) 10 and 20 (LH +6/7) of 6 naturally cycling women and 6 OCP users demonstrated that OCPs interfered with NCS formation on CD20, their natural peak presence. Although this confirmed prior observation based on electron microscopic sampling, OCPs unexpectedly induced limited but distinct amounts of NCSs already on CD10, when they are never present in natural cycles. Thus, OCPs can cause secretory changes in the endometrium during the proliferative phase. In a novel finding, robust NCS formation on CD20 was dependent on a 4 ng/mL progesterone threshold but did not correlate linearly with serum progesterone levels. Given the threshold being close to that serving as evidence for ovulation, NCSs can serve as ovulation markers.
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Affiliation(s)
- Edward J Nejat
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY, USA Department of Obstetrics and Gynecology & Women's Health, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Michael J Szmyga
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Gregory Zapantis
- Department of Obstetrics and Gynecology & Women's Health, Albert Einstein College of Medicine, Bronx, NY, USA New York Reproductive Wellness, Jericho, NY, USA
| | - U Thomas Meier
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY, USA
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Rybak EA, Szmyga M, Zapantis G, Rausch M, Beshay VE, Polotsky AJ, Coutifaris C, Carr BR, Santoro N, Meier UT. The nucleolar channel system reliably marks the midluteal endometrium regardless of fertility status: a fresh look at an old organelle. Fertil Steril 2011; 95:1385-9.e1. [PMID: 21067716 PMCID: PMC3347775 DOI: 10.1016/j.fertnstert.2010.10.030] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2010] [Revised: 09/03/2010] [Accepted: 10/13/2010] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To determine whether nucleolar channel systems (NCSs) in the midluteal endometrium are associated with overall fertility status and/or with unexplained infertility. DESIGN Retrospective and prospective clinical studies. SETTING Repository of stored specimens from prior multicenter study and private infertility center. PATIENT(S) Retrospective study that included 97 women (49 fertile couples, 48 infertile couples) who had been randomized for endometrial biopsy during the midluteal or late luteal phase. The prospective study included 78 women with a variety of infertility diagnoses. INTERVENTION(S) Endometrial biopsies were obtained and assessed for the presence of NCSs by indirect immunofluorescence. MAIN OUTCOME MEASURE(S) The presence of NCS was graded semiquantitatively and dichotomized as normal versus low or absent. RESULT(S) Normal presence of NCS was significantly associated with the midluteal phase compared with the late luteal phase (80% vs. 29%). However, there was no association between presence of NCS and fertility status or between presence of NCS and unexplained infertility. CONCLUSION(S) Midluteal phase endometrium consistently forms NCSs regardless of fertility status, including unexplained infertility. This indicates a possible role for the NCS in initiating the window of endometrial receptivity. However, the consistent presence of NCSs across several different types of infertility challenges the likelihood that inadequate secretory transformation is a cause of infertility.
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Affiliation(s)
- Eli A. Rybak
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx NY
- Division of Reproductive Endocrinology and Infertility, Department of Obstetrics & Gynecology and Women’s Health, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, New York
| | - Michael Szmyga
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx NY
| | - Gregory Zapantis
- Division of Reproductive Endocrinology and Infertility, Department of Obstetrics & Gynecology and Women’s Health, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, New York
- East Coast Fertility, Plainview, New York
| | - Mary Rausch
- Division of Reproductive Endocrinology, Department of Obstetrics and Gynecology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania
| | - Victor E. Beshay
- Division of Reproductive Endocrinology, Department of Obstetrics and Gynecology, University of Texas – Southwestern Medical Center, Dallas, Texas
| | - Alex J. Polotsky
- Division of Reproductive Endocrinology and Infertility, Department of Obstetrics & Gynecology and Women’s Health, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, New York
| | - Christos Coutifaris
- Division of Reproductive Endocrinology, Department of Obstetrics and Gynecology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania
| | - Bruce R. Carr
- Division of Reproductive Endocrinology, Department of Obstetrics and Gynecology, University of Texas – Southwestern Medical Center, Dallas, Texas
| | - Nanette Santoro
- Division of Reproductive Endocrinology and Infertility, Department of Obstetrics & Gynecology and Women’s Health, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, New York
| | - U. Thomas Meier
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx NY
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Guffanti E, Kittur N, Brodt ZN, Polotsky AJ, Kuokkanen SM, Heller DS, Young SL, Santoro N, Meier UT. Nuclear pore complex proteins mark the implantation window in human endometrium. J Cell Sci 2008; 121:2037-45. [PMID: 18505792 PMCID: PMC2657873 DOI: 10.1242/jcs.030437] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Nucleolar channel systems (NCSs) are membranous organelles appearing transiently in the epithelial cell nuclei of postovulatory human endometrium. Their characterization and use as markers for a healthy receptive endometrium have been limited because they are only identifiable by electron microscopy. Here we describe the light microscopic detection of NCSs using immunofluorescence. Specifically, the monoclonal nuclear pore complex antibody 414 shows that NCSs are present in about half of all human endometrial epithelial cells but not in any other cell type, tissue or species. Most nuclei contain only a single NCS of uniform 1 microm diameter indicating a tightly controlled organelle. The composition of NCSs is as unique as their structure; they contain only a subset each of the proteins of nuclear pore complexes, inner nuclear membrane, nuclear lamina and endoplasmic reticulum. Validation of our robust NCS detection method on 95 endometrial biopsies defines a 6-day window, days 19-24 (+/-1) of an idealized 28 day cycle, wherein NCSs occur. Therefore, NCSs precede and overlap with the implantation window and serve as potential markers of uterine receptivity. The immunodetection assay, combined with the hitherto underappreciated prevalence of NCSs, now enables simple screening and further molecular and functional dissection.
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Affiliation(s)
- Elisa Guffanti
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA
| | - Nupur Kittur
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA
| | - Z. Nilly Brodt
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA
| | - Alex J. Polotsky
- Department of Obstetrics, Gynecology and Women's Health, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA
| | - Satu M. Kuokkanen
- Department of Obstetrics, Gynecology and Women's Health, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA
| | - Debra S. Heller
- Department of Pathology, UMDNJ – New Jersey Medical School, Newark, NJ 07101, USA
| | - Steven L. Young
- Department of Obstetrics and Gynecology, University of North Carolina School of Medicine, Chapel Hill, NC 27599, USA
| | - Nanette Santoro
- Department of Obstetrics, Gynecology and Women's Health, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA
| | - U. Thomas Meier
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA
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Kittur N, Zapantis G, Aubuchon M, Santoro N, Bazett-Jones DP, Meier UT. The nucleolar channel system of human endometrium is related to endoplasmic reticulum and R-rings. Mol Biol Cell 2007; 18:2296-304. [PMID: 17429075 PMCID: PMC1877118 DOI: 10.1091/mbc.e07-02-0154] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2007] [Accepted: 04/02/2007] [Indexed: 11/11/2022] Open
Abstract
The nucleolar channel system (NCS) is a well-established ultrastructural hallmark of the postovulation endometrium. Its transient presence has been associated with human fertility. Nevertheless, the biogenesis, composition, and function of these intranuclear membrane cisternae are unknown. Membrane systems with a striking ultrastructural resemblance to the NCS, termed R-rings, are induced in nuclei of tissue culture cells by overexpression of the central repeat domain of the nucleolar protein Nopp140. Here we provide a first molecular characterization of the NCS and compare the biogenesis of these two enigmatic organelles. Like the R-rings, the NCS consists of endoplasmic reticulum harboring the marker glucose-6-phosphatase. R-ring formation initiates at the nuclear envelope, apparently by a calcium-mediated Nopp140-membrane interaction, as supported by the calcium-binding ability of Nopp140, the inhibition of R-ring formation by calcium chelators, and the concentration of Nopp140 and complexed calcium in R-rings. Although biogenesis of the NCS may initiate similarly, the reduced presence of complexed calcium and Nopp140 suggests the involvement of additional factors.
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Affiliation(s)
- Nupur Kittur
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
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Isaac C, Pollard JW, Meier UT. Intranuclear endoplasmic reticulum induced by Nopp140 mimics the nucleolar channel system of human endometrium. J Cell Sci 2001; 114:4253-64. [PMID: 11739657 DOI: 10.1242/jcs.114.23.4253] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Exogenous expression of the characteristic repeat domain of the nucleolar chaperone Nopp140 induces the formation of intranuclear structures, termed R-rings. Here, the R-rings are identified as extensive stacks of membrane cisternae in the otherwise membrane-free nucleus. They consist of bona fide endoplasmic reticulum (ER) containing integral membrane proteins of the smooth and rough ER. Although lacking nuclear pore complexes and lamina, the R-rings derive specifically from the inner nuclear membrane. These findings are consistent with the idea that all transmembrane proteins synthesized in the ER and the outer nuclear membrane can freely diffuse through the pore membrane domain into the inner membrane. Uniquely, the soluble transfected Nopp140 is directly involved in the generation of these membrane stacks as it localizes to the electron dense matrix in which they are embedded. The only well-documented example of intranuclear membrane proliferation is the nucleolar channel system of the postovulation human endometrium. The transient emergence of the nucleolar channel system correlates precisely with the readiness of the endometrium for the implantation of the fertilized egg. The nucleolar channel system exhibits an ultrastructure that is indistinguishable from R-rings, and nuclei of human endometrium harbor Nopp140 and ER marker containing structures. Therefore, the nucleolar channel system appears to be identical to the R-rings, suggesting a role for Nopp140 in human reproduction.
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Affiliation(s)
- C Isaac
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA
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Hohman WR, Shaw ST, Macaulay L, Moyer DL. Ultrastructural hemostasis in response to vascular injury induced by intrauterine devices in human endometrium. Thromb Res 1978; 12:1037-50. [PMID: 694814 DOI: 10.1016/0049-3848(78)90059-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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