Lipi-Series: Lipid Droplet Detection Probes

$180.00

Lipid Droplet Research
∼ Features ~
– High selectivity to lipid droplet (low background)
– 4 color available (blue, green, red, and deep red)
– High intracellular retentivity
– Applicable to both live and fixed cells

Storage Condition: ambient temperature, protect from light
Shipping Condition: ambient temperature

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DescriptionQ & APositive controlManualS.D.S(LD01)S.D.S(LD02)S.D.S(LD03)S.D.S(LD04)

Product Description
Lipid droplets (LDs) are composed of neutral lipids such as triacylglycerol & cholesteryl ester that are surrounded by phospholipid monolayers and are seen ubiquitously, not only in adipocytes1). LDs were originally thought to serve as a lipid storage unit, until a recent study showing that LDs play an important role in regulating lipid metabolism, autophagy2) and cellular senescence3). Therefore, LDs have gained great attention as an important tool to elucidate the mechanisms of their formation, growth, fusion, and retraction.
Lipi Probes and Lipid Droplets

1) T. Fujimoto et al., “Lipid droplets: a classic organelle with new outfits.Histochem Cell Biol., 2008, 130(2), 263.
2) R. Singh et al., “Autophagy regulates lipid metabolism.” Nature, 2009, 458(7242), 1131.
3) M. Yokoyama et al., “Inhibition of endothelial p53 improves metabolic abnormalities related to dietary obesity.Cell Reports, 2014, 7(5), 1691.

For more information on Lipi-series and examples, please refer to the publication below:

4) Tatenaka, Y. et al., “Monitoring Lipid Droplet Dynamics in Living Cells by Using Fluorescent Probes” Biochemistry.“, 2019, 58(6), 499-503.
Notes: Lipi-Series is Patent Pending.

 


Oleic acid treated HeLa cells with Lipi Product Series
Oleic acid treated HeLa cells with Lipi Product Series

<Staining Condition>
A medium that contained oleic acid (200 μmol/l) was added and incubated overnight. Then, the supernatant was removed and the cells were washed with PBS. Each Lipi product series (1 μmol/l) was added and the cells were incubated for 15 minutes.

<Detection Condition>
Lipi-Blue: Ex. 405 nm / Em. 450 – 500 nm
Lipi-Green: Ex. 488 nm / Em. 500 – 550 nm
Lipi-Red: Ex. 561 nm / Em. 565 – 650 nm
Lipi-Deep Red: Ex.640 nm / Em.650-700 nm


Multiple Staining: Lipi-Deep Red (Purple) co-staining with GFP fluorescence (green) in HeLa cells

After adding Lipi-Deep Red (0.1 μmol/l) to the Arf4-GFP expressed Hela cells and the cells were incubated for 30 minutes, the cells were treated with 4% PFA (PBS) to fix, and washed with PBS three times. Fluorescent imaging was conducted by confocal microscopy.
Multiple Staining: Lipi-Deep Red co-staining with GFP fluorescence in HeLa cells

<Detection Condition>
GFP: Ex/Em=488/400-552 nm
LDs:  Ex/Em=640/630-700 nm

Multiple Staining:  Lipi-Deep Red (RED) co-staining with GFP fluorescence (green) in HeLa cells
Multiple Staining:  Lipi-Deep Red co-staining with GFP fluorescence in HeLa cells

*Data was kindly provided by Dr. G. Belov, at University of Maryland, College Park


Lipi-Blue co-staining with GFP and RFP fluorescence in hMGEC (Multiple Staining)

In the following article, hMGEC treated with rosiglitazone (Rosi) was co-stained with tandem RFP-GFP-tagged LC3B and Lipi-Blue to observe autophagosome /autophagolysosome and lipid droplets. It was observed lipid droplets in hMGEC treated with Rosi for 4 days and 14 days was accumulated. For details about the experiment, please visit the reference below.

Kim, S. et al., “Eicosapentaenoic acid (EPA) activates PPARγ signaling leading to cell cycle exit, lipid accumulation, and autophagy in human meibomian gland epithelial cells (hMGEC)“, The Ocular Surface, 2020, 18(3), 427-437.


Mouse liver adipose tissue (Frozen section) with Lipi Series

After adding Lipi series to the 4% PFA (PBS) fixed mouse liver adipose tissue and the tissue were incubated for overnight, and washed with PBS. Fluorescent imaging was observed by fluorescence microscopy.

Mouse liver adipose tissue (Frozen section) with Lipi Series


Reagent Comparison

Lipid Droplet Detection Probe Comparison

*Leaks in GFP filter


High Correlation with Antibody Detection Method: Lipi-Blue (LD01)
After fixing HepG2 with 4% PFA, cells are stained with 100 nmol/l Lipi-Blue. Then, Adipophilin (ADFP) expressed on lipid-droplet membrane was labeled with anti-ADFP antibody
High Correlation with Antibody Detection Method: Lipi-Blue

Scale Bar: 20 μm
<Detection Condition>
Lipi-Blue: Ex. 405 nm / Em. 450 – 500 nm
Anti-ADFP antibody (Alexa Fluor® 647): Ex. 640 nm / Em. 650 – 700 nm


High Selectivity toward Lipid Droplet
Live HeLa cells were treated with Oleic acid and were stained with 100 nmol/l Lipi-Blue and 100 nmol/l Nile Red. Nile red had high background due to the limit in selectivity toward lipid droplets.
High Selectivity toward Lipid Droplet
<Detection Condition>
Lipi-Blue: Ex. 405 nm / Em. 450 -500 nm
Lipi-Green: Ex. 488 nm / Em. 500 – 550 nm
Lipi-Red: Ex. 561 nm / Em. 565 – 650 nm
Lipi-Deep Red: Ex. 640 / Em. 650 – 700 nm
Nile Red: Ex. 561 nm / Em. 565 – 650 nm


Filter Leakage Rate (Lipi-Red vs Nile Red)

HepG2 cells were stained with Lipi-Red and Nile Red. Lipi-Red was imaged with Green excitation (G), but not Blue excitation (B). However, Nile Red was imaged in both filter. Lipi-Red is preferable for multi-staining.
Filter Leakage Rate (Lipi-Red vs Nile Red)


High Intracellular Retentivity
Live HepG2 cells were stained with each of the Lipi products, Nile Red, and Reagent B.
High Intracellular Retentivity of Lipid Droplet Detection Probes

Lipi-Blue and Lipi-Green had higher retention in cells after 24 hours post staining than Lipi-Red, Nile Red, and Reagent B.


Quantitative analysis
Changes in lipid droplets were examined after the addition of oleic acid or Triacsin C (acyl-CoA synthetase inhibitor) to the HepG2 cell culture medium. For analysis, the number and total area of lipid droplets per cell were computed from the images acquired with CQ1, a confocal quantitative image cytometer (Yokogawa Electric Corporation).

<Imaging of lipid droplets and cell nuclei>
lipid droplets and cell nuclei

CQ1 captured images of lipid droplets with a 447/60 nm bandpass filter and cell nuclei with a 525/50 nm bandpass filter. Lipid droplets and cell nuclei were individually identified and computed the number and total area by using the CellPathfinder analysis software.
Imaging conditions:
Plate: 96 well plate, objective lens: x 20
excitation: 405 nm (Lipi-Blue), blue/488 nm (SYBR Green), Green

<Analysis by the number and total area of lipid droplets>
Analysis by the number and total area of lipid droplets

Based on the detected data of cell nuclei and lipid droplets, the number and total area of lipid droplets per cell computed were shown in the graphs below. Compared to the control value, the number and total area of lipid droplets per cell were increased 7-10 times by the addition of oleic acid, but the addition of Triacsin C inhibited lipid droplet formation and showed a 50-60% decrease.
Experimental conditions
HepG2 cells (1 x 103 cells) were disseminated on a 96-well plate and incubated overnight. After the culture supernatant was removed, the cells treated with DMEM plus FBS only (control), DMEM plus FBS and 200 μmol/L oleic acid (Oleic acid), and DMEM plus FBS and 5 μmol/L Triacsin C (Triacsin C) were incubated overnight. Cells were then washed twice with PBS buffer, fixed with 4% PFA for 5 minutes at room temperature, and washed twice with PBS buffer again. Finally, cells were stained in the dark for 2 hours at room temperature with 0.5 μmol/L Lipi-Blue working solution, and quantitative analysis was performed through CQ1.


Related Product Information

Function Product Code Product Size
Imaging LD01 Lipi-Blue 10 nmol
LD02 Lipi-Green 10 nmol
LD03 Lipi-Red 100 nmol
LD04 Lipi-Deep Red 10 nmol
Quantification (Plate Reader, FCM) LD05 Lipi Droplet Assay Kit-Blue 1 set
LD06 Lipi Droplet Assay Kit-Deep Red 1 set

Recommended Filter: Wavelength for Excitation and Emission
Recommended Filter: Wavelength for Excitation and Emission

What should I do if the fluorescence is not detected?
1. Filter conditions
Check the fluorescence spectrum of the dye on the product HP and confirm if the excitation / emission wavelength for your filter is suitable.
2. Concentration of Lipi probe working solution
Optimize the concentration within the following range:
Lipi-Blue, Lipi-Green: 0.1-0.5 μmol / L
Lipi-Red: 1-5 μmol / L
* If fluorescence is not detected even under the above conditions, prepare a higher concentration of the working solution.
Lipi-Blue & Lipi-Green: 1-2 μmol / L
Lipi-Red: 10 – 20 μmol / L

3. Incubation time
Incubate for 1-2 hours after adding Lipi probe working solution.

4. Assay conditions (fixed cells)
Please refer to Q2.

5. Other
Depending on the cell type, lipid droplets can be smaller than usual and it may be too difficult to observe.
If that is the case, please observe under a high magnification microscope or prepare for positive control with oleic acid treated cells.

Can I use Lipi-dye for fixed cells?
Yes, Lipi-dye can be used for fixed cells.

* Please use paraformaldehyde (PFA) for fixation. Alcohol fixation is not recommended because it may affect the structure of lipid droplets.

* Depending on the cell, it may not be stained or weakened in sensitivity due to fixed conditions before and after staining. In that case, please consider fixed conditions.
Fix cells after staining  <HepG2 cells>
1. Remove the medium and wash twice with PBS.
2. Add Lipi-dye Working solution(in PBS) in the cells and incubated at 37 ℃ for 15 minutes.
3. Remove the supernatant and wash twice with PBS.
4. Add 2 ml of 4% paraformaldehyde (PFA) /PBS solution to the cells and incubate at room temperature for 5 minutes.
5. Remove the supernatant and wash with PBS.
6. Observe under a fluorescence microscope.

○ Fix cells before staining <HeLa cell>
1. Remove the medium and wash twice with PBS.
2. Add 2 ml of 4% paraformaldehyde (PFA) /PBS solution to the cells and incubate at room temperature for 5 minutes.
3. Remove the supernatant and wash twice with PBS.
4. Add Lipi-dye Working solution(in PBS) in the cells and incubated at 37 ℃ for 15 minutes.
5. Remove the supernatant and wash with PBS.
6. Observe under a fluorescence microscope.

Can I use Lipi-dye for frozen tissue?
Yes, Lipi-dye can be used for frozen tissue.

* Please use paraformaldehyde (PFA) for fixation. Alcohol fixation is not recommended because it may affect the structure of lipid droplets.

Mouse liver adipose tissue <Frozen section>
1. Add 4% paraformaldehyde (PFA)/PBS solution to the mouse liver adipose tissue (Frozen section) and incubate at room temperature for 5 minutes.
2. Remove the supernatant and wash with PBS, and add the Lipi-series Working solution (in PBS) in the cells and incubated at 4 ℃ for overnight.
3. Remove the supernatant and wash with PBS, observe under a fluorescence microscope.

Are there any information about filter used in co-staining?
Yes, please refer to the table below and choose the filter.

Preparing a stock solution of oleic acid
Required Reagents:
・BSA (bovine serum albumin)
・Oleic acid
・0.1 mol/L Tris-HCl (pH 8.0)
Procedure:
(1) Dissolve 0.14 g/mL BSA in 0.1 mol/L Tris-HCl (pH 8.0).
(2) Add 4 mmol/L oleic acid to a disposable centrifuge tube.
(3) Add BSA solution (prepared in step 1).
(4) Cap the tube and mix on a rotary shaker (Be sure the solution is transparent, indicating that oleic acid has been conjugated to BSA).
(4) Filter the solution prepared above (step 4) using 0.22μm filter membranes.
(5) Store oleic acid stock solution at 4˚C.
*Use the appropriate amount of oleic acid stock solution for culture medium to prepare working solution. *Oleic acid working solution cannot be stored. Please prepare the working solution immediately before usage.

Inducing lipid droplets
(1) Incubate cells for 24 hours at 37˚C in a 5% CO2 atmosphere.
(2) Add 200 µmol/L working solution (prepared from oleic acid stock solution) to culture medium and incubate for further 24 hours.

Related Categories
Cell Staining Intracellular Fluorescent Probes

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