Macrophage CCR5 Pathway: Chemotactic Signaling, Inflammatory Regulation, and Roles in Disease Microenvironments

CCR5 is one of the important chemokine receptors in macrophages. It primarily recognizes CC chemokines such as CCL3, CCL4, and CCL5, and regulates macrophage recruitment, migration, inflammatory cytokine release, phagocytic function, and tissue microenvironment remodeling through G protein-coupled receptor signaling. In studies of inflammation, infection, tumors, atherosclerosis, fibrosis, and metabolic abnormalities, the CCR5 pathway is commonly used to explain the recruitment of monocytes/macrophages to lesion sites and changes in their functional states.

Keywords: CCR5; macrophages; CCL3; CCL4; CCL5; chemokine receptor; inflammatory microenvironment; monocyte recruitment; G protein-coupled receptor; PI3K-AKT; MAPK; NF-κB

1、Basic Composition of the CCR5 Pathway

1.1 CCR5 Receptor

CCR5 belongs to the CC chemokine receptor family and is a typical seven-transmembrane G protein-coupled receptor. It is expressed in monocytes, macrophages, T cells, dendritic cells, and some tissue-resident immune cells. In macrophages, CCR5 participates not only in chemotactic migration but is also closely associated with the intensity of inflammatory responses, tissue infiltration patterns, and intercellular communication.

CCR5 expression is dynamically regulated. Inflammatory stimuli, pathogen-associated molecules, tissue damage signals, cytokines, and metabolic environments can all alter its expression level. For example, LPS, TNF-α, IFN-γ, hypoxia, oxidative stress, and tumor microenvironment signals may influence membrane expression, ligand responsiveness, and downstream signaling intensity of CCR5 in macrophages.

1.2 Major Ligands

(1) CCL3

CCL3, also known as MIP-1α, is one of the important ligands of CCR5 and can promote monocyte and macrophage migration toward inflammatory sites. It is often markedly elevated during infection, tissue injury, and inflammatory amplification, and can cooperate with other chemokines to form cell recruitment gradients.

(2) CCL4

CCL4, also known as MIP-1β, can also bind CCR5 and induce macrophage chemotaxis. CCL4 is often co-expressed with CCL3 and participates in local immune cell accumulation, inflammatory intercellular communication, and maintenance of chemokine networks.

(3) CCL5

CCL5, also known as RANTES, is one of the most extensively studied ligands in the CCR5 pathway. CCL5 can be produced by T cells, platelets, endothelial cells, fibroblasts, tumor cells, and macrophages, and plays important roles in chronic inflammation, tumor immune microenvironments, vascular inflammation, and tissue fibrosis.

Table 1 Main Components and Functional Positioning of the CCR5 Pathway

Component	Molecular property	Role in macrophages	Research significance
CCR5	CC chemokine receptor; G protein-coupled receptor	Mediates chemotactic migration, inflammatory responses, and tissue infiltration	Important node for evaluating macrophage recruitment and inflammatory microenvironments
CCL3	CC chemokine	Promotes inflammatory cell recruitment and local chemotactic gradient formation	Commonly used in infection and acute inflammation model analysis
CCL4	CC chemokine	Cooperatively regulates monocyte/macrophage migration	Reflects activation status of chemokine networks
CCL5	CC chemokine	Induces CCR5-dependent migration, inflammatory amplification, and tissue infiltration	Widely used in tumor, vascular inflammation, and chronic inflammation studies
Gi protein	Downstream receptor signaling molecule	Links CCR5 with PI3K, MAPK, Ca²⁺, and other pathways	Used to assess activation of canonical CCR5 GPCR signaling
β-arrestin	Receptor internalization and signaling regulatory molecule	Regulates CCR5 desensitization, internalization, and noncanonical signaling	Influences sustained receptor responsiveness and signal termination

2、CCR5-Mediated Signal Transduction in Macrophages

2.1 G Protein-Dependent Signaling

After binding to its ligands, CCR5 mainly initiates downstream signaling through Gi proteins. Gi proteins can inhibit adenylyl cyclase activity and reduce cAMP levels, while releasing Gβγ subunits that further activate PI3K, PLC, MAPK, and small GTPase-related signaling. This process is the core basis for CCR5-mediated macrophage migration and inflammatory responses.

In macrophages, CCR5 signaling usually does not act in isolation but is intertwined with TLR, TNF receptor, IFN receptor, integrin, and Fc receptor signaling. CCR5 provides spatial chemotactic and positioning signals, whereas other inflammatory receptors provide activation, phagocytosis, killing, or inflammatory cytokine expression signals.

2.2 PI3K-AKT Pathway

After CCR5 activation, Gβγ subunits can promote PI3K signaling and subsequently activate AKT. The PI3K-AKT pathway participates in macrophage polarized migration, cytoskeletal rearrangement, cell survival, and metabolic adaptation. For macrophages in inflamed tissues, this pathway helps them move directionally along chemokine gradients and maintain local survival capacity.

PI3K-AKT signaling can also affect macrophage adaptation to glucose metabolism, lipid metabolism, and oxidative stress. In tumor, atherosclerotic, and chronic inflammatory environments, CCR5-related PI3K-AKT activation may promote persistent macrophage infiltration and retention within lesions.

2.3 MAPK Pathway

CCR5 can activate signaling branches such as ERK, JNK, and p38 MAPK. ERK is more closely associated with cell migration, survival, and some transcriptional responses, whereas p38 and JNK are often associated with inflammatory cytokine expression, stress responses, and tissue injury signals.

In macrophages, MAPK signaling can promote the expression of inflammation-related molecules such as TNF-α, IL-6, IL-1β, CCL2, and CXCL8. If CCR5 signaling is activated together with TLR4 or other pattern-recognition receptors, an amplification loop between chemokines and inflammatory cytokines can form.

2.4 NF-κB-Related Inflammatory Transcription

CCR5 itself is not a classic strong NF-κB-activating receptor, but its signaling can influence NF-κB transcriptional activity through MAPK, PI3K, and other costimulatory pathways. In the context of infection or tissue injury, CCR5 ligands can enhance inflammatory cytokine release from macrophages, creating stronger immune cell recruitment and local amplification effects in inflammatory regions.

CCR5-NF-κB-related effects should usually be interpreted in relation to the stimulus background. CCL5 stimulation alone and CCL5 combined with LPS, IFN-γ, or TNF-α stimulation do not produce identical results. The latter is more likely to show enhanced inflammatory transcription and chemokine network expansion.

Table 2 CCR5 Downstream Signaling and Functional Effects

Signaling branch	Main molecules	Functional effects in macrophages	Interpretation focus
Gi protein signaling	Gi, Gβγ	Initiates chemotaxis, migration, and canonical GPCR signaling	Can be validated by pertussis toxin sensitivity
PI3K-AKT	PI3K, AKT	Regulates migration, survival, polarity establishment, and metabolic adaptation	Suitable for analyzing chemotaxis and tissue infiltration
PLC-Ca²⁺	PLCβ, IP3, Ca²⁺	Affects cell activation, membrane movement, and local signaling responses	Related to rapid chemotactic responses
MAPK	ERK, JNK, p38	Regulates inflammatory cytokine expression and stress responses	Requires time-course analysis
NF-κB	IκBα, p65	Participates in inflammatory transcriptional amplification	Often synergizes with TLR or TNF signaling
Rho GTPases	Rac1, RhoA, Cdc42	Regulates cytoskeletal rearrangement and directional migration	Closely related to chemotaxis assays
β-arrestin	β-arrestin 1/2	Receptor desensitization, internalization, and signaling regulation	Affects sustained CCR5 responsiveness

3、Regulation of Macrophage Function by CCR5

3.1 Monocyte Recruitment and Macrophage Infiltration

The most direct function of the CCR5 pathway is to mediate the migration of monocytes and macrophages toward chemokine-enriched regions. In inflamed tissues, tumor tissues, damaged vascular walls, infectious lesions, and fibrotic tissues, increased levels of CCL3, CCL4, and CCL5 can form chemotactic gradients that guide CCR5-positive cells into the local microenvironment.

In research, this process is commonly verified using Transwell migration assays, real-time cell migration assays, in vivo immune cell infiltration analysis, flow cytometry, and tissue immunostaining. If macrophage recruitment decreases after CCR5 inhibition or knockdown, this supports the involvement of CCR5 in cell migration and tissue infiltration.

3.2 Inflammatory Cytokine Release

CCR5 activation can promote macrophage production of multiple inflammatory cytokines and chemokines. Its effect often manifests as enhancement of an existing inflammatory background rather than independently determining all inflammatory transcription programs. In the presence of LPS, TNF-α, IFN-γ, or pathogen stimulation, CCR5 signaling is more likely to amplify inflammatory cytokine expression.

This amplification can further promote the recruitment of neutrophils, monocytes, and T cells, sustaining local inflammatory responses. In chronic inflammation, the CCR5 axis may participate in inflammatory cell retention and maintenance of the inflammatory microenvironment.

3.3 Macrophage Phenotypic Transition

CCR5 is associated with changes in macrophage phenotype, but it should not be simply summarized as unidirectionally promoting “M1” or “M2” polarization. Macrophage states are jointly determined by tissue environment, stimulus combinations, metabolic status, cell origin, and time stage. CCR5 mainly provides chemotactic positioning and inflammatory amplification signals, and its impact on phenotype must be interpreted within specific disease models.

In some inflammatory environments, CCR5 signaling may promote inflammation-related markers such as TNF-α, IL-1β, IL-6, and iNOS. In tumor microenvironments or reparative tissues, CCR5-positive macrophages may also participate in immunosuppression, angiogenesis, matrix remodeling, and tumor progression. Studies should comprehensively evaluate markers such as CD86, iNOS, TNF-α, CD206, Arg1, IL-10, and TGF-β.

3.4 Phagocytosis and Anti-Infective Function

CCR5 can affect the probability of spatial contact between macrophages and pathogens, apoptotic cells, or cellular debris, and can influence phagocytosis-related processes through cytoskeletal rearrangement. In infection models, the CCR5 pathway may promote rapid immune cell recruitment and enhance pathogen clearance, but may also cause excessive inflammation and tissue injury.

For pathogen infection studies, the effect of CCR5 on “cell recruitment” should be distinguished from its effect on the “killing capacity of individual macrophages.” The former can be reflected by the number of infiltrating cells in tissues, whereas the latter requires evaluation through phagocytosis assays, intracellular pathogen burden, ROS/NO generation, and cytokine levels.

Table 3 Major Effects of CCR5 on Macrophage Function

Functional direction	Main manifestation	Key detection indicators	Research interpretation
Chemotactic migration	Macrophage migration toward CCL3/CCL4/CCL5 gradients	Transwell migration, chemotactic index, number of infiltrating cells	One of the core functions of CCR5
Tissue infiltration	Increased macrophages in inflammatory or tumor regions	F4/80, CD68, CD11b, CCR5 colocalization	Reflects activation of local chemotactic axes
Inflammatory amplification	Enhanced inflammatory cytokine and chemokine expression	TNF-α, IL-6, IL-1β, CCL2, CCL5	Often synergizes with TLR/TNF signaling
Phenotypic regulation	Changes in inflammatory or reparative markers	iNOS, CD86, Arg1, CD206, IL-10	Must be interpreted with tissue background
Phagocytic function	Changes in ability to engulf particles, pathogens, or cellular debris	Phagocytic index, ROS, NO, pathogen burden	Should not be inferred only from CCR5 expression
Cell retention	Persistent presence of macrophages in lesions	Tissue immunostaining, flow cytometry	Related to chronic inflammation and tissue remodeling

4、Roles of the CCR5 Pathway in Different Pathological Models

4.1 Infection and Inflammation Models

In infection models, pathogen-associated molecules can induce the release of CCL3, CCL4, and CCL5, causing CCR5-positive monocytes and macrophages to accumulate at infection sites. This process contributes to pathogen clearance, but may also aggravate inflammatory tissue damage.

For example, in studies of bacterial, viral, or parasitic infection, the CCR5 pathway is often associated with macrophage infiltration, inflammatory cytokine release, and local tissue destruction. If CCR5 blockade reduces cell infiltration and tissue damage but increases pathogen burden, this indicates that CCR5 has dual roles in inflammatory injury and host defense.

4.2 Tumor Microenvironment

Tumor cells, cancer-associated fibroblasts, endothelial cells, and immune cells can all produce CCR5 ligands such as CCL5, thereby promoting recruitment of CCR5-positive monocytes/macrophages into tumor tissues. After entering the tumor microenvironment, macrophages may participate in immunosuppression, angiogenesis, matrix remodeling, tumor cell invasion, and therapeutic resistance.

In tumor research, the CCR5 pathway should not be understood only as an inflammatory pathway. Its role is often to shape the immune microenvironment, causing accumulation of tumor-associated macrophages and altering T cell infiltration, cytokine networks, and matrix architecture. Detection should combine CCR5, CCL5, CD68, CD163, CD206, MHC-II, PD-L1, and T cell-related indicators.

4.3 Atherosclerosis and Vascular Inflammation

In atherosclerosis, CCR5 participates in monocyte recruitment to the vascular intima and is associated with platelet, endothelial cell, and vascular wall inflammatory signals. CCL5 can accumulate in vascular inflammatory regions, promoting adhesion and migration of CCR5-positive monocytes and their differentiation into macrophages.

After entering plaques, macrophages can engulf lipids to form foam cells and participate in inflammatory cytokine release, necrotic core expansion, and plaque instability. Therefore, the CCR5 pathway is commonly used to explain immune cell recruitment to vascular walls and maintenance of chronic vascular inflammation.

4.4 Fibrosis and Tissue Repair

In liver, lung, kidney, and cardiac fibrosis models, CCR5-related chemokines can promote monocyte/macrophage accumulation in injured tissues. Macrophages have stage-dependent roles in fibrosis: in the early stage, they may promote inflammatory clearance and injury responses; when persistently activated, they may promote fibroblast activation, TGF-β release, collagen deposition, and tissue remodeling.

CCR5 blockade can reduce inflammatory macrophage infiltration and fibrosis progression in some models, but its effect depends on disease stage and tissue type. Studies should simultaneously detect inflammatory cytokines, collagen deposition, α-SMA, TGF-β, MMP/TIMP balance, and macrophage subset changes.

Table 4 Research Directions of the CCR5 Pathway in Disease Models

Research model	Role of CCR5 pathway	Macrophage-related effects	Recommended combined indicators
Infection models	Promotes immune cell recruitment to infection sites	Enhances pathogen clearance or inflammatory injury	Pathogen burden, TNF-α, IL-6, tissue injury score
Acute inflammation	Forms chemotactic gradients and amplifies inflammation	Increased monocyte/macrophage infiltration	CCL3, CCL4, CCL5, CD68, Ly6C
Tumor microenvironment	Recruits CCR5-positive myeloid cells	Promotes immunosuppression, angiogenesis, and matrix remodeling	CD68, CD163, CD206, PD-L1, T cell infiltration
Atherosclerosis	Promotes monocyte entry into vascular walls	Foam cell formation and maintenance of vascular inflammation	CCL5, CD68, lipid deposition, inflammatory cytokines
Fibrosis	Promotes inflammatory cell recruitment and tissue remodeling	Affects fibroblast activation and collagen deposition	TGF-β, α-SMA, COL1A1, MMP/TIMP
Metabolic inflammation	Regulates immune infiltration in adipose tissue or liver	Promotes chronic low-grade inflammation	CD11c, F4/80, TNF-α, IL-1β

5、Experimental Strategies for Studying the Macrophage CCR5 Pathway

5.1 Expression Detection

(1) mRNA detection

qPCR can be used to detect transcriptional levels of CCR5 and its ligands CCL3, CCL4, and CCL5. This method is suitable for comparing expression changes in the CCR5 axis under different stimuli, tissue origins, or treatment groups. However, mRNA levels cannot directly represent receptor membrane expression or functional activity.

(2) Protein detection

Western blot can analyze total CCR5 protein level; flow cytometry can detect CCR5 surface expression in macrophages; immunofluorescence or immunohistochemistry can observe the spatial distribution of CCR5 in tissues. For chemokine receptors, membrane surface expression and tissue localization usually have greater functional interpretive value than total protein.

(3) Spatial localization

In tissue sections, colocalization of CCR5 with macrophage markers such as CD68, F4/80, CD11b, and Iba1 can be used to determine whether CCR5 is mainly expressed in macrophage populations. In tumors, vascular plaques, and fibrotic tissues, spatial localization is particularly important for interpreting the origin of CCR5-positive cells.

5.2 Functional Validation

(1) Chemotaxis assay

Transwell chemotaxis assays can directly evaluate the effects of CCL5, CCL3, or CCL4 on macrophage migration. If migration decreases after adding a CCR5 antagonist, CCR5 siRNA, or CCR5 knockout, CCR5-dependent chemotaxis is supported.

(2) Signaling pathway detection

After short-term CCL5 stimulation, detection of p-AKT, p-ERK, p-p38, p-JNK, p-p65, and other indicators can determine whether CCR5 downstream signaling is activated. A time-course design is very important because GPCR signaling is often rapid, transient, and prone to desensitization.

(3) Inflammatory cytokine detection

Under CCL5 stimulation alone or combined with LPS, TNF-α, or IFN-γ, changes in TNF-α, IL-6, IL-1β, CCL2, CCL5, and other molecules can be detected. If CCR5 blockade reduces these indicators, CCR5 participation in inflammatory amplification is suggested.

(4) In vivo validation

In animal models, CCR5 deficiency, pharmacological blockade, or ligand neutralization strategies can be used together with tissue macrophage infiltration, pathological scoring, and functional indicators to analyze the role of the CCR5 pathway. In vivo studies need to distinguish the combined effects of CCR5 on macrophages, T cells, and other immune cells.

Table 5 Common Experimental Methods for the Macrophage CCR5 Pathway

Research purpose	Recommended methods	Key indicators	Interpretation points
Detect CCR5 expression	qPCR, Western blot, flow cytometry	CCR5 mRNA, CCR5 protein, surface CCR5	Surface expression is closer to functional status
Detect ligand changes	ELISA, qPCR, multiplex assay	CCL3, CCL4, CCL5	Ligand-producing cell sources should be clarified
Observe tissue localization	Immunofluorescence, immunohistochemistry	CCR5 and CD68/F4/80 colocalization	Can determine infiltration of CCR5-positive macrophages
Analyze chemotactic function	Transwell, real-time cell migration	Number of migrated cells, chemotactic index	CCR5 blockade control is required
Analyze downstream signaling	Western blot, phospho-antibody detection	p-AKT, p-ERK, p-p38, p-p65	Short-term stimulation time course is required
Validate dependency	siRNA, CRISPR, antagonist	Changes in migration, inflammatory cytokines, infiltration	Cytotoxicity effects should be excluded
Validate in vivo mechanisms	Disease models, tissue flow cytometry, pathological staining	Macrophage infiltration, tissue injury score	Other CCR5-positive cells must be considered

6、Reagent and Tool Selection for the CCR5 Pathway

Table 6 Reagents and Detection Tools Related to the CCL3/CCL4/CCL5 Ligand Axis

Cat. No.	Product Name	Grade/Specification	Corresponding pathway node	Application positioning
rp173591	BP-CCL3	Moligand™	CCL3-CCR5	Can be used for CCL3-related ligand binding, chemotactic axis research, or labeled ligand experiments
rp173675	CCL3	Moligand™	CCL3-CCR5	Used to stimulate macrophage CCR5 signaling and analyze chemotaxis, migration, and inflammatory signaling
rp174023	Flu-CCL3	Moligand™	CCL3-CCR5	Used for CCL3 binding, receptor localization, or ligand-tracking experiments
rp170414	Recombinant Human CCL3/MIP-1 alpha Protein	Carrier Free, Bioactive, High performance, ≥90%(SDS-PAGE)	CCL3-CCR5	Used for macrophage chemotactic stimulation, CCR5 downstream signal activation, and inflammatory response induction
rp175062	[¹²⁵I]CCL3 (human)	Moligand™	CCL3-CCR5	Used for CCR5 ligand binding, receptor affinity, and competitive binding assays
C1479515	CCL3 Human Pre-designed siRNA Set A		CCL3	Used to knock down CCL3 and validate the source and function of CCL3 in the macrophage CCR5 axis
EJ1514070	Human Macrophage Inflammatory Protein 1 Alpha (MIP-1α/CCL3) ELISA Kit	BioReagent	CCL3	Used to detect CCL3 levels in human-derived samples or cell culture supernatants
EJ1512055	Rat Macrophage Inflammatory Protein 1 Alpha (MIP-1α/CCL3) ELISA Kit	BioReagent	CCL3	Used for CCL3 quantification in rat inflammation or macrophage-related models
EJ1512767	Mouse Macrophage Inflammatory Protein 1 Alpha (MIP-1α/CCL3) ELISA Kit	BioReagent	CCL3	Used for CCL3 quantification in mouse macrophage infiltration, inflammation models, and CCR5 axis studies
C1490269	CCL3L1 Human Pre-designed siRNA Set A		CCL3L1-CCR5-related ligand axis	Used to knock down CCL3L1 and analyze regulation of CCR5 signaling by CCL3 family ligands
rp183664	Recombinant Human CCL3L1/LD78 beta Protein	Carrier Free,Bioactive,ActiBioPure™,High Performance,PBS Only,≥95%(SDS-PAGE),See COA	CCL3L1-CCR5-related ligand axis	Used for CCR5-related chemotaxis, receptor activation, and ligand selectivity studies
EJ1514974	Human Chemokine C-C-Motif Ligand 3 Like Protein 1 (CCL3L1) ELISA Kit	BioReagent	CCL3L1	Used for CCL3L1 quantification in human-derived samples and auxiliary analysis of CCR5-related ligand networks
C1460859	CCL3L3 Human Pre-designed siRNA Set A		CCL3L3-related ligand node	Used for CCL3L3 knockdown; suitable for studies of CCL3 homologous ligand regulation
C1485111	CCL4 Human Pre-designed siRNA Set A		CCL4-CCR5	Used to knock down CCL4 and validate its role in the macrophage CCR5 chemotactic axis
Ab093490	Recombinant CCL4/MIP-1 beta Antibody	Recombinant, ExactAb™, Validated, See COA	CCL4-CCR5	Used to detect CCL4 expression or localization; suitable for Western blot, immunostaining, or method validation
rp143746	Recombinant Human CCL4/MIP-1 beta Protein	Animal Free,Carrier Free,Bioactive,ActiBioPure™,Azide Free,High Performance,PBS Only,≥96%(SDS-PAGE&HPLC)	CCL4-CCR5	Used for CCR5 ligand stimulation, macrophage chemotaxis, and downstream signaling studies
rp170426	Recombinant Human CCL4/MIP-1 beta Protein	Carrier Free,Bioactive,ActiBioPure™,High Performance,≥90%(SDS-PAGE),See COA	CCL4-CCR5	Used for CCL4-induced macrophage migration and inflammatory response experiments
rp175063	[¹²⁵I]CCL4 (human)	Moligand™	CCL4-CCR5	Used for CCR5 ligand binding, competitive binding, and receptor pharmacology experiments
rp175375	vCCL4	Moligand™	CCL4/CCR5-related axis	Used for viral chemokine-related CCR5 ligand research
EJ1512768	Mouse Macrophage Inflammatory Protein 1 Beta (MIP-1β/CCL4) ELISA Kit	BioReagent	CCL4	Used for CCL4 quantification in mouse macrophage inflammation models and CCR5 axis studies
C1471883	CCL4L1 Human Pre-designed siRNA Set A		CCL4L1-CCR5-related ligand axis	Used to knock down CCL4L1 and analyze the effect of CCL4 homologous ligands on CCR5 signaling
rp143752	Recombinant Human CCL4L1 Protein	Animal Free,Carrier Free,Bioactive,ActiBioPure™,Azide Free,High Performance,PBS Only,≥97%(SDS-PAGE&HPLC)	CCL4L1-CCR5-related ligand axis	Used for CCL4L1-related chemotaxis, receptor activation, and ligand function studies
rp184881	Recombinant Human CCL4L1/MIP-1 beta Isoform LAG-1 Protein	Carrier Free,≥95%(SDS-PAGE),expressed in E. coli; See COA	CCL4L1-CCR5-related ligand axis	Used for CCR5 ligand function studies related to CCL4L1 isoforms
C1465475	CCL4L2 Human Pre-designed siRNA Set A		CCL4L2-related ligand node	Used for CCL4L2 knockdown; suitable for CCL4 family ligand network research
rp173682	CCL5	Moligand™	CCL5-CCR5	Used to stimulate macrophage CCR5 signaling and analyze chemotaxis, migration, inflammatory amplification, and tissue infiltration mechanisms
C1466886	CCL5 Human Pre-designed siRNA Set A		CCL5-CCR5	Used to knock down CCL5 and validate its source and regulation of the macrophage CCR5 pathway
Ab177891	NI-0701 (anti-CCL5)	Carrier Free, Recombinant, ExactAb™, Low Endotoxin, Azide Free, Validated, Animal Free, ≥95%(SDS-PAGE&SEC-HPLC), See COA	CCL5-CCR5	Used to block CCL5 and validate CCL5-dependent macrophage chemotaxis or inflammatory amplification
rp329428	Recombinant Human CCL5/RANTES Protein	≥95%(SDS-PAGE)	CCL5-CCR5	Used for macrophage CCR5 ligand stimulation, migration assays, and downstream signal activation
rp175064	[¹²⁵I]CCL5 (human)	Moligand™	CCL5-CCR5	Used for CCR5 ligand binding, receptor affinity, and competitive binding experiments
EJ1514214	Human Regulated On Activation In Normal T-Cell Expressed And Secreted/C-C Motif Chemokine Ligand 5 (RANTES/CCL5) ELISA Kit	BioReagent	CCL5	Used to quantify CCL5 in human-derived samples, macrophage culture supernatants, or tissue extracts
EJ1512093	Rat Regulated On Activation In Normal T-Cell Expressed And Secreted (RANTES/CCL5) ELISA Kit	BioReagent	CCL5	Used for CCL5 detection in rat inflammation models, fibrosis models, or macrophage-related studies
EJ1512834	Mouse Regulated On Activation In Normal T-Cell Expressed And Secreted (RANTES/CCL5) ELISA Kit	BioReagent	CCL5	Used for CCL5 detection in mouse macrophage recruitment, tumor microenvironment, and inflammation models

Table 7 Tools Related to CCR5 Receptor Detection and Functional Intervention

Cat. No.	Product Name	Grade/Specification	Corresponding pathway node	Application positioning
C1472906	CCR5 Human Pre-designed siRNA Set A		CCR5	Used to knock down CCR5 and validate CCR5 dependence of macrophage chemotaxis, migration, and inflammatory signaling
C1485360	Ccr5 Mouse Pre-designed siRNA Set A		CCR5	Used for CCR5 knockdown studies in mouse macrophages or mouse models
C1471262	Ccr5 Rat Pre-designed siRNA Set A		CCR5	Used for CCR5 functional validation in rat-derived cells or models
Ab093557	CCR5 Rat mAb	Carrier Free,Low Endotoxin,Azide Free,Validated,PBS Only,≥95%(SDS-PAGE&HPLC),See COA	CCR5	Used for CCR5 expression detection, flow cytometry, immunostaining, or receptor function studies
C1421083	CCR5 antagonist 2		CCR5	Used for pharmacological blockade of CCR5 and validation of CCR5-dependent migration, signal activation, and inflammatory effects
C1421110	CCR5 antagonist 3		CCR5	Used for CCR5 pathway inhibition and pharmacological mechanism studies
C608421	CCR5 antagonist 34	Moligand™	CCR5	Used for CCR5 receptor blockade, ligand response inhibition, and chemotactic function validation
P744622	pLenti-CCR5-sgRNA		CCR5	Used for CCR5 antibody detection validation and negative controls
P744623	pLenti-CCR5-sgRNA		CCR5	Used for CCR5 transcription detection, primer validation, and negative controls
Ab169252	Leronlimab (anti-CCR5)	Carrier Free, Recombinant, ExactAb™, Low Endotoxin, Azide Free, Validated, Animal Free, ≥95%(SDS-PAGE&SEC-HPLC), See COA	CCR5	Used for CCR5 blockade, receptor function validation, and CCR5-related macrophage migration or inflammation studies

Table 8 Gene Knockout Validation Materials Related to the CCR5 Pathway

Cat. No.	Product Name	Corresponding pathway node	Application positioning
P744538	pLenti-CCL3-sgRNA	CCL3	Used as a negative control/method validation material for CCL3 antibody or protein detection systems
P744539	pLenti-CCL3-sgRNA	CCL3	Used as a control material for CCL3 transcription detection or primer validation
P744534	pLenti-CCL3L1-sgRNA	CCL3L1	Used for validation of CCL3L1 protein detection methods
P744535	pLenti-CCL3L1-sgRNA	CCL3L1	Used as a control for CCL3L1 transcription detection
P744536	pLenti-CCL3L3-sgRNA	CCL3L3	Used for CCL3L3 protein detection validation
P744537	pLenti-CCL3L3-sgRNA	CCL3L3	Used for CCL3L3 transcription detection validation
P744542	pLenti-CCL4-sgRNA	CCL4	Used for CCL4 protein detection validation
P744543	pLenti-CCL4-sgRNA	CCL4	Used for CCL4 transcription detection validation
P744540	pLenti-CCL4L1-sgRNA	CCL4L1	Used for CCL4L1 protein detection validation
P744541	pLenti-CCL4L1-sgRNA	CCL4L1	Used for CCL4L1 transcription detection validation
P744544	pLenti-CCL5-sgRNA	CCL5	Used for CCL5 protein detection validation
P744545	pLenti-CCL5-sgRNA	CCL5	Used for CCL5 transcription detection validation
P744622	pLenti-CCR5-sgRNA	CCR5	Used for CCR5 protein detection, antibody validation, and negative controls
P744623	pLenti-CCR5-sgRNA	CCR5	Used for CCR5 transcription detection, primer validation, and negative controls

The CCR5 pathway in macrophages is mainly reflected in chemotactic recruitment, tissue infiltration, and inflammatory microenvironment regulation. Its biological significance depends on specific tissue contexts and disease stages. It may participate in pathogen clearance and injury repair, but may also promote chronic inflammation, tumor immunosuppression, vascular inflammation, and fibrosis progression.

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