From: bense@oasys.dt.navy.mil (Ron Bense)
Newsgroups: talk.abortion
Subject: Re: In Suzanne's Defense
Date: 8 Oct 92 20:49:19 GMT
Reply-To: bense@oasys.dt.navy.mil (Ronald Bense)
Organization: Carderock Division, NSWC, Bethesda, MD

Peter, here is an article about the interchangeability of embryos and
cancer tumors, complete with references. Please read.

]From: bmc@mayo.edu (Bruce Cameron)
]Subject: Re: About those UnBornThings
]Message-ID: <1992Jun9.222059.11231@bmw.mayo.edu>
]
]orr@turing.mcs.gvsu.edu (Wes Orr {Academic Computing}) writes:
]|> In answer to your question any time one human sperm cell and one
]|>human egg cell merge they are a living human being, biologically
]|>speaking.  They have no genetic ability to become anything else.
]
]Well perhaps, then again perhaps not.
]
]There is no doubt that the cell(s) are living, and biologically
]human, but as for becoming something else ...
]
]Cancer Cells vs. Embryonic cells
]
]        Observation:
]             cancer cells spread in a manner resembling embryonic
]cell
]             migrations.
]                     Barbera et al.-- demonstrated specific
]adhesive
]                     recognition may control homing of optic nerves
]                     from retina to optic tectum
]                     Nicolson et al.-- demonstrated that cells from
]primary
]                     tumors for secondary tumors at sites where
]those cells
]                     have greatest adhesion.
]
]                     have greatest adhesion.
]
]        Question:
]              do we have embryo-like tumors or tumor-like Embryos?
]                   Mintz et al.--isolated teratoma cells, injected
]the
]                   cells into early blastocysts (mice). The
]blasocysts
]                   were allowed to implant into the uteri of other
]                   female mice (different genotype from cancer
]donor).
]                   embryos developed into tumor free adults, but
]with
]                   cells of both genotypes.
]
]                    also observed:
]                        (mouse)teratomas develop in clusters that
]                         resemble (mouse) embryos & will
]differentiate
]                         into the embryonic tissue types if in a
]                         suitable environment.
]
]                         normal (mouse) embryos will form teratomas
]if
]                         implanted in the testes.
]
]Now, if cancer cells can develop as an embryo does if placed in a
]receptive uterus (suitable environment) and an embryo can develop
]as a cancer if placed in an unsuitable environment, then are you
]sure that an embryo can't change form?
]
]sources:
]
]Barbera et al., Adhesive Recognition and Retinotectal Specificity.,
]Proc. Nat. Acad. Sci. U.S., 70:2482-2486
]
]Faber J.J., and Thornburg K. L., Placental Physiology, Raven Press,
]New York, 1983
]
]Mintz, B., Clonal Basis of Mammalian Differentiation., Symp. Soc.
]Exp. Bio., 25:345-369
]
]Nicolson, G. L. et al, Transmembrane Control of the Receptors
]on Normal and Tumor Cells. II. Surface Changes Associated with
]Transformation and Malignancy. Biochem. Biophys. Acta 458:1-72
]
]Nicolson, G. L., Cell and Tissue Interactions Leading to Malignant
]Tumor Spread., Amer. Zool. 18:71-80
]
]--
]--Bruce
]
]"Truth is ultimately a philosophical concept,...,
] and standards of truth are adequate for practical
] purposes if they are substantially more reliable
] then the system undergoing evaluation"
]                                C. E. Metz
]---------------------------------------------------
]bmc@mayo.edu    (507) 284-3288  fax: (507) 284-9623
]Mayo Foundation, 200 1st St SW, Rochester MN 55905
]---------------------------------------------------
]#include <std/disclaimer>             ARS -- WD9CKW

Ron                          Think about this one (seen on a bumper sticker):
			     The road to hell is bumper-to-bumper
			     Make a U-turn to God.
The irony is priceless.


Ron                          Think about this one (seen on a bumper sticker):
			     The road to hell is bumper-to-bumper
			     Make a U-turn to God.
The irony is priceless.