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.