Publications by authors named "Richard Bodine"

4 Publications

  • Page 1 of 1

Co-transplantation of Human Ovarian Tissue with Engineered Endothelial Cells: A Cell-based Strategy Combining Accelerated Perfusion with Direct Paracrine Delivery.

J Vis Exp 2018 05 16(135). Epub 2018 May 16.

Center for Reproductive Medicine and Infertility, Weill Cornell Medical College; Tri-Institutional Stem Cell Derivation Laboratory, Weill Cornell Medical College;

Infertility is a frequent side effect of chemotherapy and/or radiotherapy and for some patients, cryopreservation of oocytes or embryos is not an option. As an alternative, an increasing number of these patients are choosing to cryopreserve ovarian tissue for autograft following recovery and remission. Despite improvements in outcomes among patients undergoing auto-transplantation of cryopreserved ovarian tissue, efficient revascularization of grafted tissue remains a major obstacle. To mitigate ischemia and thus improve outcomes in patients undergoing auto-transplantation, we developed a vascular cell-based strategy for accelerating perfusion of ovarian tissue. We describe a method for co-transplantation of exogenous endothelial cells (ExECs) with cryopreserved ovarian tissue in a mouse xenograft model. We extend this approach to employ ExECs that have been engineered to constitutively express Anti-Mullerian hormone (AMH), thus enabling sustained paracrine signaling input to ovarian grafts. Co-transplantation with ExECs increased follicular volume and improved antral follicle development, and AMH-expressing ExECs promoted retention of quiescent primordial follicles. This combined strategy may be a useful tool for mitigating ischemia and modulating follicular activation in the context of fertility preservation and/or infertility at large.
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May 2018

Engineered endothelium provides angiogenic and paracrine stimulus to grafted human ovarian tissue.

Sci Rep 2017 08 15;7(1):8203. Epub 2017 Aug 15.

Center for Reproductive Medicine and Infertility, Weill Cornell Medical College, New York, NY, 10065, United States.

Despite major advances in tissue cryopreservation and auto-transplantation, reperfusion ischemia and hypoxia have been reported as major obstacles to successful recovery of the follicular pool within grafted ovarian tissue. We demonstrate a benefit to follicular survival and function in human ovarian tissue that is co-transplanted with exogenous endothelial cells (ExEC). ExECs were capable of forming functionally perfused vessels at the host/graft interface and increased both viability and follicular volume in ExEC-assisted grafts with resumption of antral follicle development in long-term grafts. ExECs that were engineered to constitutively express anti-mullerian hormone (AMH) induced a greater proportion of quiescent primordial follicles than control ExECs, indicating suppression of premature mobilization that has been noted in the context of ovarian tissue transplantation. These findings present a cell-based strategy that combines accelerated perfusion with direct paracrine delivery of a bioactive payload to transplanted ovarian tissue.
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August 2017

Character, distribution and biological implications of ice crystallization in cryopreserved rabbit ovarian tissue revealed by cryo-scanning electron microscopy.

Hum Reprod 2010 Feb 21;25(2):470-8. Epub 2009 Nov 21.

Center for Reproductive Medicine and Infertility, Weill Medical College of Cornell University, 1305 York Avenue, New York, NY 10021, USA.

Background: Ovarian tissue banking is an emerging strategy for fertility preservation which has led to several viable pregnancies after transplantation. However, the standard method of slow cooling was never rigorously optimized for human tissue nor has the extent and location of ice crystals in tissue been investigated. To address this, we used cryo-scanning electron microscopy (cryo-SEM) to study ice formation in cryopreserved ovarian tissue.

Methods: Rabbit ovarian tissue slices were equilibrated in 1,2-propanediol-sucrose solution and cooled at either 0.3 degrees C/min or 3.0 degrees C/min after nucleating ice at -7 degrees C, or snap-frozen by plunging in liquid nitrogen. Frozen tissues were fractured, etched and coated with gold or prepared by freeze substitution and sectioning for cryo-SEM.

Results: The size, location and orientation of extracellular ice crystals were revealed as pits and channels that had grown radially between freeze-concentrated cellular materials. They represented 60% of the total volume in slowly cooled samples that were nucleated at -7 degrees C and the crystals, often >30 microm in length, displaced cells without piercing them. Samples cooled more rapidly were much less dehydrated, accounting for the presence of small ice crystals inside cells and possibly in organelles.

Conclusions: Cryo-SEM revealed the internal structure of ovarian tissue in the frozen state was dominated by elongated ice crystals between islands of freeze-concentrated cellular matrix. Despite the grossly distorted anatomy, the greater degree of dehydration and absence of intracellular ice confirmed the superiority of a very slow rate of cooling for optimal cell viability. These ultrastructural methods will be useful for validating and improving new protocols for tissue cryopreservation.
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February 2010

High pregnancy rates can be achieved after freezing and thawing human blastocysts.

Fertil Steril 2004 Nov;82(5):1418-27

The Center for Reproductive Medicine and Infertility, Weill-Cornell Medical College, New York, New York 10021, USA.

Objective: To examine the results of a 3-year trial using blastocyst cryopreservation to limit multiple pregnancy and optimize overall pregnancy per cycle.

Design: Retrospective clinical evaluation of pregnancy rates after freezing and thawing human blastocysts.

Setting: Tertiary-care academic center.

Patient(s): Seven hundred fifty-three different patients treated in 783 IVF cycles with blastocysts frozen from July 2000 to June 2003.

Intervention(s): Two thousand, two hundred fifty-nine blastocysts were frozen in cycles in which only blastocysts were cryopreserved (cycles with pronuclear stage oocytes or pre-embryos also cryopreserved were excluded from the analysis). Of these, 628 (27.6%) were thawed in 218 cycles.

Main Outcome Measure(s): Pregnancy rate per cycle with thaw.

Result(s): Four hundred seventy-nine (76.3%) blastocysts survived thawing, and 440 (92.0%) were transferred after exhibiting evidence of survival (most commonly, blastocoele reexpansion). In cycles with a thaw, 211 (96.8%) of 218 underwent intrauterine transfer. An average of 2.09 blastocysts was transferred per replacement. One hundred twenty-five (59.2%) clinical pregnancies were established, which included 23 sets of twins and 5 triplet gestations. Two sets of monozygotic twins were identified after the replacement of a single thawed blastocyst (1.6%). The age of the patient at the time of cryopreservation (<37 years) was an important factor in the establishment of clinical and ongoing pregnancy. The mode of ovarian stimulation, replacement method, and whether blastocysts were frozen on day 5 or day 6 of development did not demonstrate clinical significance.

Conclusion(s): Cryopreserved and thawed blastocysts demonstrated a similar potential for implantation when compared with fresh pre-embryos on day 3. On the basis of these results, the blastocyst stage of development appears to be optimal for clinical freeze-thaw trials.
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November 2004