BIOSTAT® CultiBag RM Culturing Convenience
batch, serum free cultivation of CHOXM 111 suspension
cells in the BIOSTATCultiBag RM 20
turning science into solutions
Dipl. Ing. Irina Bauer*, Prof. Dr. Regine Eibl*,
Generally, the inoculum for the bioreactor
Dr. Thorsten Adams**
In this application note, we describe a
is prepared by pooling T-flasks. The pre-
protocol for the propagation of the model
culture is routinely realized in 75 cm2
* Zurich University of Applied Sciences
protein secreted alkaline phosphatase
and 175 cm2 culture flasks containing
(ZHAW), Waedenswil, Switzerland
expressing CHO XM 111 suspension cells
CHOMaster FMX-8 growth medium, which
** Sartorius Stedim Biotech GmbH,
(obtained from Prof. Dr. Martin Fussenegger,
was used for maintenance of the culture.
Swiss Federal Institute of Technology,
In order to ensure optimum growth in
37079, Goettingen, Germany
Zurich) in selective, chemically defined,
T-flasks, the CHO suspension cells are incu-
protein and peptide-free ChoMaster media
bated at 37°C in a humidified atmosphere
(HP-1 and HP-5) using the disposable
of 10% CO in air. Cells are seeded at a
bioreactor BIOSTAT CultiBag RM 20 basic.
minimal density of 2–3 + 105 viable
Fig. 1: BIOSTAT® CultiBag RM20 basic.
cells/mL and subcultured or inoculated inthe larger scale when cell densities havereached values around 1*106 viablecells/mL.
In our experience, this method describedfor CHO XM 111 suspension cells can alsobe successfully applied to other animal celllines such as non-transfected CHO suspen-sion cells, Sf-9/Sf-21 suspension cells(DSMZ), and engineered HEK-293 EBNAsuspension cells (Cytos Biotechnology AG,Switzerland). Modifications mainly concernthe culture medium.
1. Equipment and Material
– BIOSTAT® CultiBag RM 20 basic
(Sartorius Stedim Biotech GmbH)
Establishment of preculture I in T-75 flask with rapidly growing, healthy CHO XM 111 suspension cells characterized by logarithmic
– CultiBag RM 2L
growth and doubling times < 24 hours
(with Sartofluor 300 Capsule, 0.2 μm;
Feeding of preculture I with ChoMaster FMX-8 growth medium
Sartorius Stedim Biotech GmbH)
Establishment of preculture II (T-175 flask) from preculture I
– CHOMaster media HP-1/HP-5
Passage cells into T-175 (minimal seeding density of 2-3*105 viable
(Cell Culture Technologies GmbH)
cells/mL), if cell density has reached 1x106 viable cells/mL
– Cedex Cell Counter (Innovatis AG)
Pooling of preculture II, inoculation and starting-up BIOSTAT CultiBag
or Cedex HiRes (Innovatis AG)
RM 20 with the disposable bioreactor bag CultiBag RM 2L operating
or NucleoCounter (ChemoMetec A/S)
with 100 mL cell suspension (1*106 viable cells/mL) and 100 mL ChoMaster HP-1 growth medium (see section 2d, 2e, 2f and 2g)
– Bioprofile Analyzer 100 or BioProfile
Fermentor/Bioreactor and medium preparation (see section 2b and 2c)
Analyzer 100+ (Nova Biomedical)
Day 8, 9, 10, 11: Sampling, successive feeding of ChoMaster growth medium (up to cell
densities of 1.2*106 viable cells/mL HP-1, subsequent feeding of HP-5
– T-flasks (T-75, T-175)
growth medium), increase of rocking rate and IPC (see section 3 and 5).
The feeding procedure should be also done in such a mode that glucose
levels below 1.0 g/L are avoided.
Partial or complete harvest of cells (see section 4).
Cell densities between 2 and 4*106 viable cells/mL may be achievable.
Aim at viabilities above 95%.
– Magnetic stirrer
– Pipetboy (Integra Biosciences AG)
(e.g. Dose-it 803, Vitaris AG)
– Sterile syringes (10mL, 50 mL)
– Serological pipettes
– Reaction tubes and sample vials (1.5 mL)
– Sterile bottles
– Sterile aluminium foil
– Safety cabinet class II
– Laminar flow module
– Roll-Boy with tripod
b. Fermentor Bioreactor preparation
In order to obtain the desired seeding cell
incubated (CO incubator) for 3 hours
100 mL of ChoMaster HP-1 growth medi-
density of about 5*105 viable cells/mL for
in order to allow the cells to settle.
um containing 0.2 % Pluronic are filled in
the CultiBag RM 2L, harvest of 5*107 viable
Alternatively for other cell lines, the cells
the CultiBag RM 2L in the safety cabinet
cells from T-flasks, pooling of the cell
can be centrifuged at maximum 200 g.
(clamped air filters)
pellets and resuspension in 100 mL freshChoMaster HP-1 growth medium have to
The consumed growth medium (FMX-8)
Keep in mind that there is no need to use
be carried out.
was then aspirated and replaced with fresh
Pluronic in media containing serum.
HP-1 growth medium (pH 7.3, 37°C) in the
Consequently, the cells were transferred
safety cabinet. After cell density check the
from T-175 into a sterile beaker (pipetting)
cell suspension in the sterile beaker was
Selective medium for T-flasks: filter-steril-
covered with a sterile aluminum foil and
ready for its use in CultiBag RM 2L.
ized, conditioned (37 °C, pH 7.3) ChoMasterFMX-8 growth medium (Cell Culture Tech-nologies).
e. Corrective agent
Additional supplements for FMX-8
medium:Used antibiotics to keep cells under selec-
f. Culture conditions
tion pressure, support cell growth and
Starting culture volume:
prevent SEAP expression: 100 mg mL –1
Final culture volume:
G418 sulphate, 5 mg mL –1 puromycin
dihydrochloride, 2.5 mg mL –1 tetracyclinehydrochloride.
Medium for BIOSTAT CultiBag RM 20:
filter-sterilized, conditioned (37 °C, pH 7.3)
ChoMaster HP-1- and HP-5 growth medium (Cell Culture Technologies)
Start cell density:
5 x 105 viable cells/mL
Final cell density:
3-4 x 106 viable cells/mL
Additional supplements for HP-1
and HP-5 medium:2.5 mg mL –1 tetracycline hydrochloride,supports cell growth and prevents SEAPexpression and 0.2 % Pluronic F68 solution(Sigma) protects cells against shear (onlynecessary in serum-free media!)
d) Preculture and Inoculum
for CultiBag RM 2L
For establishing the preculture II (T-175)
representing the subsequent inoculum
after pooling procedure approximately
4 days are required. In case of use of cryop-
reserved vials we recommend a previous
T-flask cultivation of 14 days. In other
words, the use of cryopreserved vials
instead of T-75 will prolong the precultiva-
3. Start-up and operation of BIOSTAT CultiBag RM 20
– By inserting a syringe into the CultiBag s
luer lock inoculation port, 100 mL of the
Sample 0: Analytics (section 5)
prepared cell suspension (see section 2d)
were added in the safety cabinet
Sample 1: Analytics (section 5)
(exhaust air filter was clamped off).
– The filled CultiBag (100 mL HP-1 growth
Sample 2: Analytics (section 5), feeding with 200 mL HP-1 growth medium
medium, see section 2b, and 100 mL cell
and rocking rate increase (16 rpm)
suspension, see section 2d) was put back
on the tray (clamped air filters), fixed
Sample 3: Analytics (section 5), feeding with 200 mL HP-5
and rocking rate increase (18 rpm)
– The filter heater was installed and
Sample 4: Analytics (section 5), feeding with 200 mL HP-5 and rocking rate increase 25 rpm
– Air filter lines were opened and aeration
(0.2 vvm), rocking (14 rpm, 6°) and heat-
Sample 5: Analytics (section 5), feeding with 200 mL HP-5
ing (37 °C) were switched on.
and rocking rate increase 30 rpm
6 or 7 days: Sample 6 and 7: Analytics (section 5), partial or complete cell harvest (section 4). In case of partial cell suspension harvest, the adequate amount of fresh HP-5 growthmedium is fed.
4. Complete cell harvest or Scale-up
– 200 mL of HP-5 growth medium
For harvesting the cells/product, one
Daily one 2 mL sample is taken in order
of the attached ports can be used. For the
scale-up into a larger volume the following
– For about 3 hours the cells were allowed
Cell growth and viability (1 mL sample)
procedure can be used:
to settle on the bottom of the CultiBag
by use of Cedex or NucleoCounter instead
of traditional, time-consuming, manual cell
– The BIOSTAT CultiBag RM basic station
counting (hemocytometer, Trypan Blue)
was switched off.
– The medium was removed from
Glucose, lactate, glutamine, glutamate,
the CultiBag using the tube of the
pH (1 mL sample) by use of Nova BioProfile
– The air filters were closed.
Analyzer 100 or its successor. Alternatively,other automized analyzers (e.g. YSI 2700
– The CultiBag RM 2L was removed from
Bio-chemistry Analyzer, YSI Incorporated,
the tray and transferred to a laminar
and Eppendorf Ebio plus) or also test kits
(for example, from Roche Diagnostics) are available.
– The CultiBag was hung on a tripod
standing on a Roll-Boy in the laminarflow module.
– The exhaust filter of the CultiBag was
opened whereas inlet filter was closed.
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Info-Broschüre Myanmar 24 Tage 2007 – Djoser Reisen GmbH Informationen für unsere Myanmar - Reisenden (24 Tage) Das ‚Land der 1000 Pagoden' galt einst als das reichste Land Südostasiens. Kein Reisender wird je genügend Zeit finden, alle Pagoden zu besuchen, denn neben diesen religiösen Schätzen der Vergangenheit entdeckt man in Myanmar außergewöhnliche Naturlandschaften und unberührte Strände. Das Wertvollste jedoch sind die Menschen, die durch ihre Wärme und Gelassenheit diese Reise zu einer ganz besonderen Erfahrung werden lassen.
NORGESTOMET AND ESTRADIOL VALERATE INDUCED LUTEOLYSIS IS DEPENDENT UPON THE UTERUS C. A. Peterson, J. C. Huhn, and D. J. Kesler SUMMARY Beef heifers were assigned to three groups: 1) untreated controls (n= 4), 2) Syncro-Mate B® (SMB) treated (n= 5), and 3) hysterectomized and SMB treated (n= 4). SMB was administered eight or nine days after estrus, approximately 30 days after hysterectomy. This study was conducted to determine if the uterus was necessary for SMB to induce luteolysis. SMB induced premature luteolysis as only 20% of the intact SMB treated heifers had ≥ .75 ng/mL of progesterone seven days after the time of SMB treatment compared to all (100%) of the untreated heifers (P <.05). By nine days after the time of SMB treatment, 25% of the untreated heifers and none (0%) of the intact SMB treated heifers had ≥ .75 ng/mL of progesterone; however, all (100%) of the hysterectomized SMB treated heifers had ≥ .75 ng/mL of progesterone (P <.05). Therefore, SMB-induced luteolysis required the involvement of the uterus. The luteolysin, prostaglandin F2α, is probably the secretion from the uterus that mediates the SMB-induced luteolysis. SMB treatment, however, required 7-8 days to induce luteolysis. INTRODUCTION Syncro-Mate B® (SMB) is a commercially available procedure to synchronize estrus in beef and dairy cattle. The procedure consists of a norgestomet implant and an intramuscular injection containing norgestomet and estradiol valerate administered at the time of implantation. SMB has three known mechanisms of action. First, an estrus suppression dosage of norgestomet diffuses from the implant during the nine days in situ (Kesler and Favero, 1995). Secondly, the injection causes atresia of antral follicles and recruitment of a new cohort of follicles four to five days after administration (Vasconcelos et al., 1997). Thirdly, the injection causes regression of corpora lutea (Kesler and Favero, 1995). Since the implant is left in place for nine days, the injection is needed to induce regression of corpora lutea in cows during the first half of the estrous cycle. Estradiol-17β, the active metabolite of the estradiol valerate contained within the SMB injection, has been demonstrated to hasten corpus luteum regression (Thatcher et al., 1986). Thatcher et al. (1986) reported spikes of 15-keto- 13, 14-dihydro-prostaglandin F2α (PGFM) in the peripheral blood before luteolysis ensued and concluded that estradiol-17β induced luteolysis by provoking a release of PGF2α from the uterus; however, Thatcher et al. (1986) administered estradiol-17β during the second half of the estrous cycle. Progesterone treatment during metestrus has also been reported to shorten the estrous cycle, but only by four days (Woody et al., 1967; Harms and Malven, 1969; Ginther, 1970; Battista et al., 1984; Garrett et al., 1988). The objective of this study was to determine if the hypothesis that SMB induced luteolysis is dependent upon uterine involvement was correct. MATERIALS AND METHODS Three groups of purebred Angus beef heifers from the University of Illinois beef research unit (Urbana, IL) were included in this study. The control group (n=4) was selected from a larger group of estrus-cycling females administered prostaglandin F2α (25 mg Lutalyse®; Pharmica and Upjohn, Kalamazoo, MI, USA) due to their similar timing of estrus (detectable estrus within 48 hours of each