Linha celular RAW 264.7 na pesquisa com macrófagos e imunologia

A linha celular RAW 264.7 serve como um modelo in vitro robusto para macrófagos murinos, fundamental no campo da pesquisa imunológica. Originadas de um camundongo BALB/c macho, essas células foram transformadas pelo vírus da leucemia murina de Abelson, resultando em uma linha celular semelhante a macrófagos. Devido à sua estabilidade funcional e à capacidade inerente de realizar tanto a fagocitose quanto a pinocitose, as células RAW 264.7 são essenciais para o estudo das interações hospedeiro-patógeno, tornando-as um pilar fundamental nos esforços de pesquisa imunológica [1,2].

Características morfológicas e comportamento de crescimento

Após exame, as células RAW 264.7 apresentam crescimento semiaderente, com propensão a formar tanto células aderentes fusiformes quanto células viáveis esféricas flutuantes, com diâmetro celular variando de 10 a 20 µm. Essa natureza polimórfica e adaptabilidade às condições de cultura tornam as células RAW 264.7 uma ferramenta versátil para manipulação e observação experimentais.

Função imunológica e apresentação de antígenos

Como células apresentadoras de antígenos, as células RAW 264.7 desempenham um papel fundamental no sistema imunológico. Sua função vai além do simples reconhecimento de patógenos, abrangendo o processamento e a apresentação de antígenos às células T, orquestrando assim uma resposta imunológica abrangente. Essa dinâmica facilita uma compreensão mais profunda de como o sistema imunológico identifica e neutraliza entidades estranhas.

Polarização dos macrófagos: o paradigma M0, M1 e M2

As células RAW 264.7, em seu estado basal como macrófagos M0, possuem a notável capacidade de se polarizarem tanto para o fenótipo M1 pró-inflamatório quanto para o fenótipo M2 anti-inflamatório. Essa capacidade de polarização oferece aos pesquisadores um modelo para estudar as influências e os efeitos de várias citocinas e fatores ambientais sobre a função dos macrófagos e as respostas imunológicas [3,4].

Osteoclastogênese e remodelação óssea

Embora não sejam osteoclastos propriamente ditos, as células RAW 264.7 têm sido fundamentais no estudo da osteoclastogênese — o processo de formação dos osteoclastos. Essas células facilitam a investigação da expressão gênica osteoclástica e de sua responsividade à ativação de receptores. Essa pesquisa tem implicações profundas para a compreensão da fisiopatologia de condições como a osteoporose, na qual a remodelação óssea desregulada é uma característica marcante.

Advantages and disadvantages of RAW 264.7 cells

Advantages

• Easy culturing: The RAW 264.7 cell line is easy to grow and maintain in the laboratory without any complicated requirements.
• Well-characterized: RAW 264.7 is a well-characterized cell line, which means it has stable phenotypic and functional features.
• In vitro model of macrophages: As RAW 264.7 cells are macrophages, they exhibit essential macrophage-like functions such as phagocytosis and pinocytosis. Thus, they are often used as an in vitro model of macrophages.
• Differentiation to osteoclasts: RAW 264.7 cells can be differentiated into osteoclasts using specific molecular factors. These differentiated cells are capable of performing bone remodeling, similar to osteoclasts.

Disadvantages

• Poor representation of primary macrophages: As a transformed cell line, RAW 264.7 may not accurately represent the features of primary macrophages and may have some differences in gene expression, phenotype, and function.
• Limitations in drug screening: RAW 264.7 cells may not be suitable for all types of drug screening assays, and their responses to some drugs may differ from primary macrophages.
• Strong cell adhesion: RAW 264.7 cells strongly adhere to the surface of the culture flask and can sometimes be tricky to detach.

Applications of RAW 264.7 Cells in Macrophage Mimicry and Immunological Studies

Modeling Cellular Immunological Responses

The RAW 264.7 cell line, reflecting the functionalities of authentic macrophages, is a key model for the investigation of cell responses to pathogens and immunological stimuli. A study highlighting this aspect assessed the immunomodulatory and antioxidant effects of heat-killed lactic acid bacteria on these cells, providing significant findings in immune system regulation [5].

Complementing this, research conducted in 2019 elucidated the immunological impact of RAW 264.7 exposure to polysaccharides from the plant Polygonatum sibiricum. The study concluded that these compounds trigger an immune response by the activation of NF-κB/MAPK signaling pathways, offering deep molecular understanding [6].

Exploration of Osteoclastogenesis

Functioning as a surrogate for osteoclast differentiation studies, RAW 264.7 cells contribute to the elucidation of osteoclast behavior and differentiation pathways. Such research expands our knowledge on bone resorption mechanisms and osteoporosis pathogenesis. Advanced imaging techniques are often utilized to monitor intracellular changes and analyze heme metabolism within these cells.

Gaining Molecular Insights into Osteoclastogenesis

Despite their primary role as a macrophage model, RAW 264.7 cells are also employed for in vitro osteoclastogenesis research. By inducing osteoclast-like characteristics in these cells, researchers gain insight into the differentiation process and pre-osteoclast behavior, although it is crucial to consider the cell line’s inherent characteristics and origin in these studies.

Natural Product Bioactivity Screening

Screening for bioactivity in natural products is another application where RAW 264.7 cells excel. For example, their use in a Korean study investigating the immunostimulatory properties of a herbal mixture showcased the cell line's effectiveness in identifying bioactive compounds in natural substances [7].

Pioneer your research with our RAW 264.7 cells

Research publications using RAW 264.7 cells

Many research publications are available on mouse macrophage cell line RAW 264.7:

• Polysaccharides from Polygonatum sibiricum Delar. ex Redoute induce an immune response in the RAW264. 7 cell line via an NF-κB/MAPK pathway: This study proposed that polysaccharides obtained from the Polygonatum sibiricum plant can trigger an immune response in the mouse macrophage cell line RAW 264.7 via regulating NF-κB/MAPK signaling cascade.
• Immunomodulatory effects of Tinospora crispa extract and its major compounds on the immune functions of RAW 264.7 macrophages: This article published in the International Immunopharmacology journal describes thatTinospora crispa plant extract and its major constituents have an immunomodulatory and immune-stimulatory effect on the RAW 264.7 macrophage cell line.
• Heat-killed lactic acid bacteria inhibit nitric oxide production via inducible nitric oxide synthase and cyclooxygenase-2 in RAW 264.7 cells: This study proposed that heat-killed lactic acid bacteria can potentially be used in probiotic product synthesis because they possess immune-modulatory and antioxidant properties. Researchers used RAW 264.7 cells to study these biological activities.
• Effect of herbal formulation on immune response enhancement in RAW 264.7 macrophages: This study used RAW 264.7 cells to study the immune-stimulatory effect of an herbal formulation named KM1608. The study suggested KM1608 as a potential immune response enhancement agent.
• A screening of plants used in Colombian traditional medicine revealed the anti-inflammatory potential of Physalis angulata calyces: This paper published in the Saudi Journal of Biological Sciences investigated the anti-inflammatory potential of 10 commonly used traditional Colombian plants using LPS-stimulated RAW 264.7 cells.

RAW 264.7 cells: Resources, Protocols, Videos & More

RAW 264.7 cells are often used in transfection studies. The following resources explain different transfection methods used for the RAW 264.7 cell line.

• Transfecting RAW 264.7 cells: This website will provide a protocol for transfecting RAW 264.7 macrophages using a lipofectamine reagent.
• Transfection protocol: This published article describes a detailed protocol for the transfection of RAW 264.7 cells.
• Efficient Transfection method for RAW 264.7 cells: This document describes another practical transfection approach using RAW 264.7 cells.

Videos related to RAW 264.7 cell line

• Culturing RAW 264.7 cells: This video explains RAW 264.7 cells passaging protocol.
• Transfection method: This video is about transfecting RAW 264.7 cells with a reporter gene.

Essential FAQs on the RAW 264.7 Cell Line: Insights into Macrophage Mimicry and Osteoclastogenesis Research

References

1. Taciak, B., et al., Evaluation of phenotypic and functional stability of RAW 264.7 cell line through serial passages. PloS one, 2018. 13(6): p. e0198943.
2. Wang, S., et al., Inflammatory macrophages interrupt osteocyte maturation and mineralization via regulating the Notch signaling pathway. Molecular Medicine, 2022. 28(1): p. 102.
3. Orekhov, A.N., et al., Monocyte differentiation and macrophage polarization. Vessel Plus, 2019. 3: p. 10.
4. Khabipov, A., et al., RAW 264.7 macrophage polarization by pancreatic cancer cells–a model for studying tumour-promoting macrophages. Anticancer Research, 2019. 39(6): p. 2871-2882.
5. Kang, C.-H., et al., Heat-killed lactic acid bacteria inhibit nitric oxide production via inducible nitric oxide synthase and cyclooxygenase-2 in RAW 264.7 cells. Probiotics and Antimicrobial Proteins, 2021. 13(6): p. 1530-1538.
6. Zhang, J., et al., Polysaccharides from Polygonatum sibiricum Delar. ex Redoute induce an immune response in the RAW264. 7 cell line via an NF-κB/MAPK pathway. RSC advances, 2019. 9(31): p. 17988-17994.
7. Trinh, T.A., et al., effect of herbal formulation on immune response enhancement in RAW 264.7 macrophages. Biomolecules, 2020. 10(3): p. 424.