joi, 8 decembrie 2011

Laparoscopic Excision Surgery For Endometriosis Frees Patients From Chronic Pain And Complications

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Main Category: Women's Health / Gynecology
Also Included In: Fertility;  Pain / Anesthetics
Article Date: 31 Oct 2011 - 8:00 PDT

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Almost 10 million American women of childbearing age are affected by chronic pelvic pain, gastrointestinal and urinary tract difficulties and infertility due to endometriosis, a strange condition, in which cells normally forming the lining of the uterus (endometrium) start colonizing other organs and tissues beyond the uterus. This year's annual meeting of gynecologic laparoscopic surgeons explores endometriosis from both the patient's and the physician's perspective in a Keynote session (8:00 to 10:00 AM Tuesday, November 8) at the 40th AAGL Global Congress of Minimally Invasive Gynecology that takes place from November 6 to 11, at the Westin Diplomat in Hollywood, FL.

Keynote speaker and women's health advocate Padma Lakshmi, an international supermodel and TV show host, who co-founded the Endometriosis Foundation of America to encourage research to help other women to avoid her ordeal, declares: "Endometriosis is one of the most treatable, but least treated of women's health problems. Like me, many women suffer debilitating pain and other symptoms for as long as a decade before receiving an accurate diagnosis and proper treatment."

Many women suffer silently or use painkillers, sometimes for years. Because pelvic pain can have many different causes, including appendicitis, bowel obstruction, ovarian cysts, pelvic inflammatory disease, diverticulitis, ectopic pregnancy, fibroids, IBS and many others, correct treatment can often be delayed further, as endometriosis is sometimes not immediately diagnosed.

For example, in women with endometriosis on the intestines, symptoms may prompt a physician to suggest GI tests, which will not reveal the true problem.

Lakshmi continues saying: "If a woman wants to have children, it's critical to get an accurate diagnosis and treatment as soon as possible. Endometriosis is one of the top three causes of infertility. Many women are delaying childbearing into their 30s and even 40s these days, but if you have had untreated endometriosis for many years, it may be too late. And that is a real tragedy."

The currently most effective treatment is laparoscopic excision surgery as alternative medical therapies for endometriosis are extremely limited.

Although the cause of endometriosis is unknown, researchers suspect a strong genetic component, as daughters of women suffering from the condition have a seven times higher risk of developing the disease themselves. During the AAGL meeting, members will present research on abnormal expression of Homeobox (HOX) genes (2:45 PM, Tuesday, November 8) in both the uterine lining and in the lesions of women with endometriosis. Homeobox genes play a major part in cancer and infertility. A better understanding of these genes could explain how and why endometriosis develops.

According to Linda G. Griffith, PhD, Director of the Center for Gynepathology Research at the Massachusetts Institute of Technology, who attempts to replicate human tissue as a research model for endometriosis in her lab, the disease probably has many causes, just as it has many manifestations. Dr. Griffith aims to initiate a discussion between surgeons and basic scientists in her keynote address (8:30 AM, Tuesday, November 8) that will reveal new research questions about the factors involved in endometriosis.

Griffiths comments: "Endometriosis is non-malignant, but it is far from benign. It can have devastating health consequences for a woman, such as losing a kidney or a section of bowel or becoming infertile. There is a continuum from benign to malignant, and our understanding of endometriosis at the molecular level may open opportunities to help us understand metastatic cancer, and vice versa."

Cancer and endometriosis are very similar, both have endometrial cells that are able to migrate, vascularize and invade other tissues, some quite far away from the uterus. Griffiths explains: "Through cell and tissue engineering we can begin to understand the behavior of these cells, such as the pathways they follow and why. That will help us develop therapies targeted precisely at the sub-cellular factors that lead cells astray."

Griffith and her team are developing research models that allow scientists to manipulate constellations of the factors involved in endometriosis, such as cytokines of the immune system, whilst observing their roles in the disease process.

Endometriosis can affect any pelvic or extra-pelvic organ and when it occurs beyond the reproductive organs it generally affects the bowel or bladder but it has also been discovered in atypical sites (Virtual Poster 414), like the lungs (Virtual Posters 406 and 418).

Excising deep and invasive endometriosis whilst preserving the health and functionality of surrounding organs can be extremely challenging, as can be seen by keynote speaker Grace M. Janik, M.C. Director of Reproductive Endocrinology and Infertility at St. Mary's Hospital in Milwaukee, during her live telesurgery of a laparoscopic peritoneal resection of extensive endometriosis (9:00 AM, Tuesday, November 8). Dr. Janik will lead surgeons through the surgery and as the full extent of the disease reveals itself, she will discuss what steps have to be observed along the way, including a potential treatment of the bowel and urinary tract.

The sessions at the AAGL meeting provide training for the best strategies to eliminate endometriotic lesions with conservative methods. As part of a CME course a video will be shown, "Endometriosis Bowel Resection vs. Shaving," (12:05 PM, Tuesday, November 8) where surgeons are challenged to judge whether to treat endometriosis that has infiltrated the bowel by removing the diseased portion of the bowel itself (resection) or with a more conservative technique that attempts to remove only the endometriotic cells (shaving).

The AAGL Special Interest Group on Endometriosis has designed a new classification system to accommodate the advances in understanding of the etiology, diagnosis and treatment of endometriosis.

Keynote speaker Mauricio S. Abrão, MD will introduce the new system (9:50 AM, Tuesday, November 8) and address the need for an improved classification system, which includes deep infiltrating endometriosis and pelvic pain for improving patient prognoses. He will also lead a specialized course, "Deep Endometriosis: Surgical Approach and Future Perspectives" (8:00 AM, Monday, November 7) that reviews contemporary approaches for deep endometriosis from diagnosis to treatment and explain the relationship between endometriosis and cancer.

By focusing on endometriosis, the 40th AAGL Global Congress aims to raise awareness about this 'silent' disease but also provides laprascopic surgeons with the opportunity to further enhance their skills in minimally invasive treatments.

The keynote session will be from 8:00 to 10:00 AM Tuesday, November 8, 2011, and offers the latest surgical insights in dozens of oral presentations, educational videos, surgical tutorials and poster sessions at the 40th AAGL Global Congress of Minimally Invasive Gynecology, November 6-11, 2011 at the Westin Diplomat in Hollywood, FL.

Written by: Petra Rattue
Copyright: Medical News Today
Not to be reproduced without permission of Medical News Today

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posted by Lindsay Hannover on 4 Nov 2011 at 9:42 am

I have a number of health problems. I have severe arthritis in my right leg and hip. I use a cane or walker most of the time. I'm on oxygen 24 x 7 for C.O.P.D., and I have been fighting with depression for 20 years. And I'm in so much pain at night that I'm up and down all night. My doctor put me on morphine 12 hour caps. Any suggestions of a friend or doctor?

Lindsay Hannover

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Unisense FertiliTech's EmbryoScope® Receives FDA 510(k) Clearance For 5 Day Culture Of Human Embryos In IVF

Main Category: Fertility
Also Included In: Regulatory Affairs / Drug Approvals
Article Date: 14 Oct 2011 - 2:00 PDT

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The Food and Drug Administration has cleared Unisense FertiliTech's EmbryoScope® for clinical use in the United States. The EmbryoScope® is a tri-gas IVF incubator with a built-in camera for automated time-lapse imaging of fertilized oocytes in a safe incubation environment from conception until the time of transfer. Embryo development may be continuously observed on the instrument interface without disturbances to embryo culture for up to 5 days.

Separate processing units control the incubation environment and the data acquisition to ensure safe and reliable operation. The EmbryoScope® allows incubation of up to 72 individual embryos in six sterile disposable EmbryoSlides® each with a capacity for 12 embryos.

CEO Jens Gundersen states "the clearance will allow the newly established USA office, FertiliTech Inc. to commence commercial activities in the US".

Unisense FertiliTech A/S was founded in 2003 as a subsidiary of Unisense A/S. The company develops and sells technology and software for improvement of assisted reproduction. The company has 34 employees and a domicile in Aarhus Denmark.

Article adapted by Medical News Today from original press release. Source: Unisense FertiliTech A/S
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Researchers Able To Track Critical Fertility Enzymes Using Live-Action Films Of Worm Sperm

Main Category: Fertility
Article Date: 03 Nov 2011 - 0:00 PDT

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Compared to most other cells in an organism, sperm undergo a radical transformation to become compact and mobile delivery systems for paternal DNA. Even though sperm looks and moves quite differently across species, SF State researcher Diana Chu and colleagues now say that there are at least a few key enzymes that are critical for sperm development and mobility in species as different as mice and nematode worms. The study by Chu, et al., was published today online by the journal Genetics.

These enzymes (called PP1 phosphatases) are multitaskers in the nematode, which Chu and the others discovered through unique live-action films of the enzymes at work. First, the enzymes help to separate chromosomes during sperm cell division. After that, they play a role in the development of the sperm's pseudopods - the appendages that nematode sperm use to move. Pseudopods propel the sperm with a "treadmilling" motion, and the enzymes help disassemble the cell's inner skeleton in a way that pushes the treadmilling forward.

Sperm in mammals like mice - and men - don't have pseudopods and don't move in the same way, but they still rely on the phosphatases for development and mobility. Further study of the phosphatases could someday shed light on some of the causes of human infertility, since the enzymes seem to be critical for sperm function.

Article adapted by Medical News Today from original press release. Click 'references' tab above for source.
Visit our fertility section for the latest news on this subject. "PP1 phosphatases regulate multiple stages of sperm development and motility in Caenorhabditis elegans," published in advance online by Genetics, was authored by Diana Chu, associate professor of biology at San Francisco State University, and colleagues at SF State: Jui-ching Wu, Aiza C. Go, Mark Samson, Thais Cintra, Susan Mirsoian, Tammy F. Wu, Margaret M. Jow and Eric J. Routman.
The study is now online at http://www.genetics.org/content/early/recent
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Researchers Create The First Simulator To Train Embryologists

Main Category: Fertility
Also Included In: Biology / Biochemistry
Article Date: 19 Oct 2011 - 1:00 PDT

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The Miguel Hernández University (MHU) of Elche and the Reproduction Unit of the Vistahermosa Clinic of Alicante (Spain) have presented a unique system that simulates the environment of an embryology laboratory and avoids the waste of valuable human biological material and breakages of medical equipment.

The Embryologist Station Training (TEST) consists of a console and a software that allow beginners to train the process of Intracytoplasmic Sperm Microinjection, one of the current most successful techniques of assisted reproductive techniques. The simulator will facilitate a better understanding of the whole process to students, but also will help to students and practitioners to improve their sensitivity with the controls and their capability for the immobilization and capture of sperm, the positioning of ovules and sperm microinjection.

"We have slightly adapted the control panel of a micromanipulator to make cheaper the product but we get the same precision as the original. Thus, with only two controllers and two joysticks students can be trained into the different phases of the procedure without supervision," said Federico Botella, leader of the Research Group Webdecision from the Center of Operations Research (CIO) Institute at the MHU. The console is easy to use, compact and portable. You only need a single USB cable to connect the console to a computer or laptop, so you can practice out of the embryology laboratory at your own pace.

Real micromanipulators offer no numerical support. All the process is visual. The embryologist has to focus pipettes and position objects in a 3D world that is viewed in two dimensions across the microscope. The software designed in the MHU offers two levels: beginner and expert. In the first mode, the system provides numerical aid, such as the position of the pipette or changing the colour of the tail of sperm when it is immobilized. The software also includes some warnings, as broken needle or pierced ovule. These warnings also appear in expert mode, but here the user has no numerical indications during the process. Also, Federico Botella explained: "During the training, different types of oocytes and sperm appear randomly so that the future professionals gain experience with a variety of diseases and complications. In addition, the software will keep track of successes and failures during the tests."

The EmbryoTraining project began through the collaboration between Federico Botella and Dr. José-Jesús López-Gálvez, director of the Reproduction Unit. The Vistahermosa Clinic has offered the University Specialist course in Human Reproductive Biology since 2001, where students practice ovule fertilization. The problem is that the equipment is very expensive and sometimes breaks during practices, and becomes unusable for the next day's work. At the same time, valuable human biological material is discarded, mainly oocytes, and so does clinical material such as needles and pipettes. According to Professor Botella: "When I met Dr. López-Gálvez he suggested the idea of developing a computer simulator that would make training easier and cheaper. At the WebDecision Research Group of the CIO Institute we studied the process from graphic and audiovisual material recorded in the hospital laboratory and considered it viable."

From 2008 both entities signed several R&D contracts to develop this idea and later the University applied for a national patent. Afterwards, the researchers created the spin-off company Nidoweb, which is located at the Science and Business Park of the MHU. The company is developing both the hardware and the software and has acquired the rights to exploit the patent. The console was designed at a company in Ibi. Finally, the multinational pharmaceutical company Merck became interested in the project and was granted exclusive rights to launch the product.

Merck will soon launch the simulator (TESTconsola+TESTicsi v1.0) although several reproduction centres are interested in acquiring it already. To protect the technology, the University has applied for the international PCT patent. "This first simulator covers the process of Sperm Microinjection, but we're considering designing other simulation applications related to other assisted reproduction techniques, both in humans and in animals, using our TESTconsola", said the Spanish researcher.

Article adapted by Medical News Today from original press release. Source: Asociación RUVID
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When Does Pregnancy Start? Doctors' Opinions Vary

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Academic Journal
Main Category: Pregnancy / Obstetrics
Also Included In: Fertility
Article Date: 19 Nov 2011 - 0:00 PST

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Does pregnancy start at conception - when the sperm fertilizes the egg? Or does it begin one week later when the embryo implants in the uterus? According to a survey carried out by researchers from the University of Chicago and published in the American Journal of Obstetrics and Gynecology, not even doctors appear to agree.

Dr. Farr A. Curlin and team set out to determine what Ob/Gyns (obstetrician-gynecologists) thought regarding the beginning of pregnancy. They also wanted to know what measure characteristics were linked to the belief that pregnancy started at implantation instead of conception.

The researchers posted a questionnaire to 1,800 Ob-Gyns in the USA, all of them practicing their profession at that time. Their main focus was when they thought pregnancy started.

The questionnaire gave the following response options: At conception (the union of the sperm and the egg, also known as fertilization)When the embryo is implanted in the uterusNot sureThe authors wrote that:

"Primary predictors were religious affiliation, importance of religion, and having a moral objection to abortion."

Below are some highlighted data from their findings: 66% (1154) of the doctors responded to the questionnaire57% answered - at conception28% answered - at implantation16% answered - not sureA higher percentage of religious doctors responded "at conception", as did those who were against abortion.

In an abstract in the journal, the authors concluded:

"Obstetrician-gynecologists' beliefs about when pregnancy begins appear to be shaped significantly by whether they object to abortion and by the importance of religion in their lives."

Written by Christian Nordqvist
Copyright: Medical News Today
Not to be reproduced without permission of Medical News Today

Visit our pregnancy / obstetrics section for the latest news on this subject. "Obstetrician-Gynecologists’ Beliefs about When Pregnancy Begins"
Grace S. Chunge, Ryan E. Lawrence, MD, Kenneth A. Rasinski, PhD, John D. Yoon, MD, Farr A. Curlin, MD
American Journal of Obstetrics & Gynecology. November 2011. doi:10.1016/j.ajog.2011.10.877 Please use one of the following formats to cite this article in your essay, paper or report:

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posted by Ryszard Chetkowski, MD on 18 Nov 2011 at 11:57 pm

If 66% of Ob-Gyns believe that pregnancy starts at fertilization (conception), then test tubes and petri dishes are pregnant after in vitro fertilization before embryos are transferred into the uterus.

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posted by Jennifer on 21 Nov 2011 at 12:28 pm

No, it means that OB Gyn's believe it is a baby and not cells in the test tube/petri dishes. Doctors are taught when conception is in medical school, are they not? (Conception is when the sperm and egg dance) Or is is dependent on you religion?

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posted by laura j. on 22 Nov 2011 at 11:37 am

One could say that in vitro does not create life because the embryo can not live outside the host, however, that would lead to the question of whether we are supposed to be the ones fertilizing the egg in a petri dish to begin with. Without in vitro there would be no such thing as an embryo without a host (hence all naturally fertilized eggs do imply life and pregnancy...but not their in vitro/artificial counterparts).

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posted by Jennifer on 23 Nov 2011 at 12:17 pm

Should we be fertilizing all of the eggs removed for IVF procedures? If a patient has 20+eggs and all of those eggs are fertilized, what happens next? Without a host they are in limbo and this is a morally complex situation for the patient. Especially if the patient believes life begins at conception, as I do. Should Fertility Specialists be creating all of these babies(embryos) that will never have a home/host?

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Oral Contraceptive Use Tied To Prostate Cancer

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Academic Journal
Main Category: Prostate / Prostate Cancer
Also Included In: Fertility;  Women's Health / Gynecology;  Public Health
Article Date: 15 Nov 2011 - 3:00 PST

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4 stars3 stars
There is a significant link between use of oral contraceptives or birth control pills and the incidence of prostate cancer, said researchers who set out to investigate the suggestion that byproducts of these drugs get into the environment, for instance the water supply, and lead to an increase in low level estrogen exposure in affected populations.

David Margel, and Neil E Fleshner from the Princess Margaret Hospital at the University of Toronto in Canada, write about their findings in the 14 November online issue of BMJ Open. They conclude that their study shows a significant association between oral contraceptives and prostate cancer and that:

"It is hypothesised that the [oral contraceptive] effect may be mediated through environmental oestrogen levels; this novel concept is worth further investigation."

Several studies have already suggested that exposure to estrogen may increase the risk of prostate cancer, so Margel and Fleshner took this a stage further: what if use of oral contraceptives could be placing enough estrogen into the environment that it increases prostate cancer risk in the exposed population?

For their ecological study they analyzed global data from the International Agency for Research on Cancer (IARC) for 2007 and the United Nations World Contraceptive Use 2007 report to correlate statistics on prostate cancer incidence and related deaths to use of contraceptives.

They analyzed the data by country and by continents, and they compared results from oral contraceptive use with all other forms of contraception, such as intra-uterine devices, condoms or vaginal barriers.

The results showed that: Oral contraceptive use was significantly tied to prostate cancer incidence and related deaths in individual nations.
Oral contraceptive use was also linked to prostate cancer incidence in Europe.
There was no link between use of other forms of contraceptive and prostate cancer incidence or deaths.
Further analysis showed the links with oral contraceptive use did not depend on a country's wealth.Although the authors point out the study does not prove a cause and effect link, the findings suggest there is a need for further investigation, both to confirm them and to try and find out the chemical and biological pathways between possibles causes and effects.

In their discussion, they suggest one plausible explanation for the link between oral contraceptive use and prostate cancer is that the oral contraceptives in use today frequently contain high doses of ethinyloestradiol (an orally bio-active estrogen), that is "excreted in urine without degradation. This can then end up either in the drinking water supply or passed up the food chain".

Written by Catharine Paddock PhD
Copyright: Medical News Today
Not to be reproduced without permission of Medical News Today

Visit our prostate / prostate cancer section for the latest news on this subject. "Oral contraceptive use is associated with prostate cancer: an ecological study"; David Margel, and Neil E Fleshner; BMJ Open 2011 1:e000311; published online 14 Nov 2011; DOI:10.1136/bmjopen-2011-000311; Link to Abstract. Please use one of the following formats to cite this article in your essay, paper or report:

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posted by William B. Grant on 16 Nov 2011 at 1:16 pm

This study was an ecological study. The general rules for such studies include that known risk-modifying factors be included in the analysis. Diet is a well-known risk modifying factor for prostate cancer: diets high in animal products and calcium increase risk, while diets high in vegetable products reduce risk. Another possible risk-modifying factor is prevalence of apolipoprotein E epsilon 4 (ApoE4) allels. ApoE4 increases cholesterol production in the liver. Cholesterol is a risk factor for prostate cancer. When diet and ApoE4 prevalence are included in an ecological study with oral contraceptive use and per capita GDP, oral contracteptive use is no longer statistically significant. For more, see
Grant WB.This ecological study overlooked well known prostate cancer risk-modifying factors. BMJ Open. Published online Nov. 16, 2011. http://bmjopen.bmj.com/content/1/2/e000311.abstract/reply#bmjopen_el_77

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Inadequate Supply Of Protein Building Blocks May Explain Pregnancy Failures In Bovine Cloning Experiments

Main Category: Veterinary
Also Included In: Fertility
Article Date: 27 Oct 2011 - 1:00 PDT

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Amino acids, the building blocks of proteins, are essential to support the normal growth of a developing embryo and the placenta. An insufficient supply of amino acids in the mother's uterus caused by abnormal maternal-embryo interactions may explain the developmental abnormalities and complications of pregnancy that result in the death of cloned bovine embryos, according to a cutting-edge article in the peer-reviewed journal Cellular Reprogramming published by Mary Ann Liebert, Inc.

Anna Groebner, Technische Universitaet Muenchen (Freising, Germany), and colleagues from Ludwig-Maximilians-Universitaet (Muenchen, Germany), Bavarian Health and Food Safety Authority (Oberschleissheim, Germany), and Bavarian State Institute for Agriculture (Grub, Germany), describe an experiment in which they compared the amino acid concentrations in the uterine contents from pregnant cows carrying embryos created either by in vitro fertilization (IVF) or by somatic cell nuclear transfer (SCNT). In SCNT an adult animal is cloned by transferring the DNA-containing nucleus from one of its cells into a donor egg that lacks a nucleus, and then implanting the cloned embryo into the uterus of a recipient mother. Severe placental and development abnormalities are not uncommon.

The authors show that the concentrations of several amino acids were reduced in samples from SCNT pregnancies compared to IVF pregnancies during the period preceding implantation of the embryos in the uterine lining. They report these findings and comment on their implications in the article entitled "Reduced Amino Acids in the Bovine Uterine Lumen of Cloned versus In Vitro Fertilized Pregnancies Prior to Implantation."

"These results reveal that cloned embryos are sometimes unable to establish a normal relationship with the maternal environment. This important new insight highlights the importance and potential benefit of research to understand the mechanisms that are involved," says Professor Sir Ian Wilmut, OBE, FRS, FRSE, Editor-in-Chief of Cellular Reprogramming and director of the MRC Centre for Regenerative Medicine in Edinburgh.

Article adapted by Medical News Today from original press release. Source: Mary Ann Liebert, Inc.
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Male Fertility Breakthrough Achieved By Researchers

Main Category: Fertility
Also Included In: Men's health
Article Date: 17 Nov 2011 - 1:00 PST

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A Ben-Gurion University of the Negev researcher has achieved a significant breakthrough in male fertility, producing normal sperm from mouse cells.

"This study may open new therapeutic strategies for infertile men who cannot generate sperm and/or pre-pubertal cancer patients at risk of infertility due to aggressive chemo- or radiotherapy and cannot cryopreserve sperm as in adult patients," explains Prof. Mahmoud Huleihel, of BGU's Shraga Segal Department of Microbiology and Immunology in the Faculty of Health Sciences.

The article was just published online in Nature's Asian Journal of Andrology, and according to the authors is "the first original report revealing the generation of morphologically normal spermatozoa from mouse testicular germ cells." It outlines the generation of spermatozoa from mouse testicular germ cells under in vitro culture.

Huleihel and his team used a three-dimensional Soft Agar Culture System (SACS) to generate the sperm. Previously, Huleihel pioneered the use of SACS for spermatogenesis in vitro.

Article adapted by Medical News Today from original press release. Click 'references' tab above for source.
Visit our fertility section for the latest news on this subject. The study was performed in cooperation with Prof. Eitan Lunenfeld, Soroka University Medical Center, Beer-Sheva, and Prof. Stefan Schlatt, University of Münster, Münster, Germany. It was partially supported by a grant from the German–Israel Foundation.
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Aging Human Bodies And Aging Human Oocytes Run On Different Clocks

Main Category: Seniors / Aging
Also Included In: Women's Health / Gynecology;  Fertility
Article Date: 08 Dec 2011 - 0:00 PST

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Reproductive and somatic aging use different molecular mechanisms that show little overlap between the types of genes required to keep oocytes healthy and the genes that generally extend life span, according to Coleen Murphy, Ph.D., of Princeton University, who described her new findings on oocyte aging at the American Society for Cell Biology Annual Meeting in Denver.

The different genetic pathways help explain why a woman's fertility begins to decline after she is 35 years old, while her other cells do not show significant signs of aging until decades later, Murphy explained.

To compare the molecular mechanisms that are switched on or off with the aging of oocytes and somatic cells, Murphy's lab turned to the model organism, Caenorhabditis elegans (C. elegans), the worm-like nematode that set off the whole field of longevity research with the discovery in the 1990s that gene mutations affecting insulin regulation doubled the worm's life span. Insulin/insulin-like growth factor (insulin/IGF) signaling pathways also have been identified in humans. These pathways also seem to regulate longevity in humans.

Using DNA microarrays to measure the expression levels of genes, Dr. Murphy and her colleagues noted a distinctive DNA signature for aging oocytes. They also found that the oocytes of aging insulin and transforming growth factor-beta (TGF-beta) mutant mice had the same DNA profile that characterized young females.

The researchers then compared the oocyte gene expression patterns with microarray transcription data on worms carrying the famous long-life mutations. Murphy and her colleagues found that even though somatic and reproductive aging in C. elegans both involve the insulin regulation pathway, the molecular mechanisms to maintain youthful oocyte function and to combat body aging are very different.

"It seems that maintaining protein and cell quality is the most important component of somatic longevity in worms," Dr. Murphy said, "while chromosomal/DNA integrity and cell cycle control are the most critical factors for oocyte health."

In previous studies, the Murphy lab showed that worm oocytes reach the end of their viability about halfway through the C. elegans lifespan, a pattern that also characterizes human eggs. Oocyte aging is delayed in mutant worms with decreased signaling activity in both the insulin/IGF and the TGF-beta pathways.

Using microarray technology, Murphy's lab identified the C. elegans genes that were being switched on or off as oocytes aged. The researchers revealed a distinctive genetic signature for aging oocytes that is reversed in insulin and TGF-beta mutants.

They then compared the oocyte gene expression patterns with microarray transcription data from whole worms carrying the famous long-life mutations.

Surprisingly, the patterns were different. Even though somatic and reproductive aging in C. elegans both involve the insulin regulation pathway, the mechanisms to maintain youthful oocyte function and to combat body aging are very different.

"It seems that maintaining protein and cell quality is the most important component of somatic longevity in worms," Murphy said, "while chromosomal/DNA integrity and cell cycle control are the most critical factors for oocyte health."

Finding ways to delay oocyte aging would reduce an older woman's risk of giving birth to a child with birth defects, Murphy said.

Article adapted by Medical News Today from original press release. Click 'references' tab above for source.
Visit our seniors / aging section for the latest news on this subject. Please use one of the following formats to cite this article in your essay, paper or report:

MLA

American Society for Cell Biology. "Aging Human Bodies And Aging Human Oocytes Run On Different Clocks." Medical News Today. MediLexicon, Intl., 8 Dec. 2011. Web.
8 Dec. 2011. APA

Please note: If no author information is provided, the source is cited instead.


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View the original article here