Human ova, discharge all you want, we'll make more - VeggieBoards
Forum Jump: 
 
Thread Tools
#1 Old 02-27-2012, 01:17 AM
Banned
 
Join Date: Oct 2001
Posts: 10,763
I think that perhaps this could have far-reaching implications.

Basically it says that the limitations on ovum production, after menopause, are not, as previously thought, due to a limited supply of ova, maintained alive, since the woman was an embryo (before birth she had many millions), but rather, a limited ability to convert ova stem cells into ova, past a certain stage of development, past menopause.

the article says that women were thought to have been given a "bank account" of ova at birth, but that is an over-simplification. In fact, women have even more ova before they are born, than they have at birth. By time they are born, the number has dwindled quite a lot. As they get older, the number gets even lower. It was known for sure that by puberty, they had even less, and by menopause they had none. What this experiment suggests is that it is not the number of ova that is fixed, at puberty (at about 40 x 12), but that it is the number of months (about 40*12), of conversion of ova stem cells into ova, that is "fixed," due to tissue chemistry in the ovary (sort of like developing into a mature ecosystem). And that it may be possible to extend the number of months by fiddling with tissue chemistry.

Of course the cytologists did not really "create" ova from stem cells. The culivated stem cells in a manner that allowed them to develop into ova, and in a manner that enabled the cytologists to observe that this microscopic activity was taking place. The manner being implantation of human ovary tissue into mice, who I would assume needed to be immunosuppressed in order to prevent them from killing off the human tissue. And by tagging the stem cells with genes that caused them, and their ova offspring, to fluoresce (probably by implanting genes into the stem cells from a life form that fluorseses).

What far-reaching implications? 80-year old women could have biological offspring. Though it seems unlikely, perhaps even deliver babies themselves, if stem cell tissue is removed, cultivated in mice so as produce ova, and then the ova are re-implanted in the fallopian tube, ready to get fertilized by sperm cells from a man of any age. But if that is thought to be risky, their egg cells could be implanted in the fallopian tubes of younger women.
soilman is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the VeggieBoards forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off