Example
1 - Preparation of DLE
Measles
virus-specific TF is made from
lymphocytes of BALB/c mice immunised by
live or killed virus or an antigen
derived from such measles virus.
Isolated cells are freeze-thawed and,
following micropore filtration the
filtrate is added to an immunologically
virgin human lymphoblastoid cell
line. One cell is serially expanded
10-fold with killed measles virus and
interleukin-2, to a billion cells.
Measles virus specific TF preparations
are made from this expanded cell
population.
Cell
lysis, dialysis using a 12,500 molecular
weight cut-off and a series of
concentration procedures results in a TF
preparation containing TF and
lysozyme. The molecular weight of
each preparation used is between 1,800
and 12,000. Appropriate biological
markers eg lysozyme (MW 11,000), horse
myoglobulin (MW 17.7 KD) and human
antibody light chains (MW 22 KD) are used
as controls to ensure both the recovery
of TF and absence of materials greater
than 12,000 MW in the final preparation
(viruses are hundreds of millions in
molecular weight, and reverse
transcriptase of retroviruses is 59 KD).
The
TF preparation is standardised for
potency (vide infra).
The
ability of TF to stimulate further TF
production, and the cross-species
reactivity of TF are subsequently
exploited in order to produce large
amounts of concentrated TF at low
cost. This is achieved by injecting
the TF preparation into pregnant goats 3
times prior to delivery. Colostrums are
collected during the first 3 days
post-delivery and TF preparations were
made from these by micropore filtration
excluding molecules >12,500 mol
wt. Following freeze thawing and
lyophilising x 3 the preparation is
tested for potency as described below and
standardised at 200 South Carolina
units/ml.
Elsewhere,
the patents describe the "dose
regimen":
One
to up to ten, but preferably three or
four capsules (20 S.C. units per capsule)
per day should be ingested.