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Mycobacterium tuberculosis — 10 papers

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Preset queries: immune evasion · macrophage role · host-directed therapy · antigen processing · epigenetics

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Research Question: How does Mycobacterium tuberculosis survive after being engulfed by immune cells — by (a) preventing the phagosome from becoming destructive, (b) interfering with acidification and lysosome fusion, (c) manipulating host signaling through secreted factors, and (d) occupying alternative lung immune cell niches during long-term infection?
41
Evidence Items
10
Papers Cited
4
Mechanisms
26
Unique Effectors
A

Preventing the Phagosome from Becoming Destructive

13 items ▼
PtpA (Protein Tyrosine Phosphatase A)
Blocks host v-ATPase by binding to subunit H, preventing the vacuolar proton pump from being recruited to the phagosomal membrane. Also dephosphorylates VPS33B (a component of the HOPS tethering complex), disrupting phagosome-lysosome fusion machinery.
Paper 01 — Rankine-Wilson 2021 Paper 03 — Echeverría-Valencia 2023 Paper 07 — Chandra 2022 Paper 09 — Witt 2025
SapM (Secreted Acid Phosphatase)
Hydrolyzes PI3P on the phagosomal membrane, removing the lipid signal required for recruitment of EEA1 and other tethering factors that drive phagosome maturation and fusion with lysosomes.
Paper 01 — Rankine-Wilson 2021 Paper 06 — Kilinç 2021 Paper 07 — Chandra 2022
PknG (Protein Kinase G)
Eukaryotic-like serine/threonine protein kinase secreted into the macrophage cytosol; inhibits phagosome-lysosome fusion. Promotes mycobacterial survival inside macrophages. Also ubiquitinates TRAF2 and degrades TAK1 via p62-dependent selective autophagy, suppressing innate immunity.
Paper 01 — Rankine-Wilson 2021 Paper 02 — Bo 2023 Paper 03 — Echeverría-Valencia 2023 Paper 06 — Kilinç 2021 Paper 07 — Chandra 2022 Paper 09 — Witt 2025
ESAT-6 / CFP-10 (ESX-1 Secretion System)
Prevents Rab5→Rab7 conversion on the phagosomal membrane, blocking endosomal maturation. The ESAT-6/CFP-10 secretion system modulates phagosome maturation and is essential for mycobacterial virulence and phagosomal escape.
Paper 01 — Rankine-Wilson 2021 Paper 03 — Echeverría-Valencia 2023 Paper 07 — Chandra 2022
ManLAM (Mannosylated Lipoarabinomannan)
Blocks Ca2+/calmodulin signaling cascade required for PI3K activation, preventing PI3P generation on the phagosomal membrane. Also inhibits recruitment of GTPases to the phagosome. Recognition by the mannose receptor (MR) prevents phagosome-lysosome fusion and phagosome maturation.
Paper 01 — Rankine-Wilson 2021 Paper 03 — Echeverría-Valencia 2023 Paper 06 — Kilinç 2021 Paper 08 — Kim 2022
Coronin 1 (TACO)
Retained on the Mtb-containing phagosome, where it actively prevents fusion with lysosomes by blocking the recruitment of PI3K-dependent signaling components. Normally shed during phagosome maturation but Mtb maintains its presence.
Paper 01 — Rankine-Wilson 2021
NdkA (Nucleoside Diphosphate Kinase)
GTPase-activating protein that inactivates Rab5 and Rab7, preventing their recruitment to the phagosomal membrane. This blocks the Rab conversion cascade required for phagosome maturation.
Paper 07 — Chandra 2022
Cell-wall Glycolipids (TDM, PIM)
Trehalose dimycolate (TDM / cord factor) interferes with FcγR-mediated phagosome maturation through Mincle, SHP-1, and FcγRIIB signaling. PIM and LAM inhibit Rab effectors, EEA1, and PI3K hVPS34 recruitment to infected phagosomes.
Paper 01 — Rankine-Wilson 2021 Paper 03 — Echeverría-Valencia 2023
SecA1 / SecA2 (Sec Secretion Pathway)
ATPase activity of SecA1 and SecA2 proteins contributes to arrest of phagosome maturation and mycobacterial survival inside macrophages.
Paper 03 — Echeverría-Valencia 2023
Rab GTPase Manipulation
Mtb maintains Rab5 (early endosome marker) on the phagosome while preventing acquisition of Rab7 (late endosome marker). This arrests the phagosome at the early endosomal stage, preventing progression to a destructive late phagolysosome.
Paper 01 — Rankine-Wilson 2021 Paper 03 — Echeverría-Valencia 2023 Paper 07 — Chandra 2022 Paper 09 — Witt 2025
Phagosome Maturation Arrest (General)
The Mtb-containing phagosome is arrested at an early endosomal stage: it retains early markers (Rab5, transferrin receptor), excludes late markers (Rab7, LAMP-1), and fails to acquire hydrolytic enzymes. This is the central survival strategy.
Paper 01 — Rankine-Wilson 2021 Paper 03 — Echeverría-Valencia 2023 Paper 06 — Kilinç 2021 Paper 07 — Chandra 2022 Paper 09 — Witt 2025
DC-SIGN Exploitation
DC-SIGN induction in alveolar macrophages defines privileged target host cells for mycobacteria. Mtb ManLAM recognized by DC-SIGN induces IL-10 and counteracts TLR-4 response, reducing antimicrobial capacity.
Paper 03 — Echeverría-Valencia 2023 Paper 08 — Kim 2022
Apoptosis & Autophagy Evasion
Virulent Mtb strains (H37Rv) evade apoptosis of infected alveolar macrophages, while avirulent strains (H37Ra, BCG) induce it. Virulent Mtb stimulates necrosis via mitochondrial membrane disruption, favoring bacterial release. The foamy macrophage phenotype reduces autophagy of Mtb-infected cells.
Paper 03 — Echeverría-Valencia 2023 Paper 07 — Chandra 2022
B

Interfering with Acidification & Lysosomal Fusion

8 items ▼
PtpA — V-ATPase Exclusion
PtpA binds subunit H of the vacuolar H+-ATPase and excludes the proton pump from the phagosomal membrane, directly preventing luminal acidification. The phagosome remains at pH 6.2–6.5 instead of reaching the bactericidal pH ~4.5–5.0.
Paper 01 — Rankine-Wilson 2021 Paper 03 — Echeverría-Valencia 2023 Paper 07 — Chandra 2022 Paper 09 — Witt 2025
V-ATPase Subunit A Degradation
Mtb permits proteasomal degradation of the V-ATPase catalytic subunit A through ubiquitination signaling, while also regulating phagosomal pH reduction via CISH-mediated signaling.
Paper 03 — Echeverría-Valencia 2023
1-TbAd (1-Tuberculosinyladenosine)
A secreted lipid metabolite that neutralizes the phagosomal pH by acting as a proton sink or by modulating membrane properties to counteract acidification.
Paper 06 — Kilinç 2021 Paper 07 — Chandra 2022
Phagosomal pH Stabilization
The Mtb-containing phagosome is maintained at pH 6.2–6.5 (mildly acidic) rather than the normal phagolysosomal pH of ~4.5–5.0. This prevents activation of acid-dependent hydrolases (cathepsins) that would digest the bacterium.
Paper 01 — Rankine-Wilson 2021 Paper 03 — Echeverría-Valencia 2023 Paper 09 — Witt 2025
MNC1 Cells — Intrinsic V-ATPase Deficiency
CD11clo MNC1 monocyte-derived cells are intrinsically deficient in V-ATPase and lysosomal biogenesis genes (ATP6V0D2, LAMP1, CTSD, CTSB), meaning they cannot properly acidify or mature their phagosomes even without Mtb manipulation.
Paper 05 — Zheng 2024
HDAC-6 Suppression
HDAC-6 is required for maintaining the acidic phagosomal environment. Mtb epigenetically modulates histone deacetylase activity, compromising the host cell's ability to sustain phagosomal acidification.
Paper 10 — Khadela 2022
TDM / Mincle Signaling Blockage
Glycolipid TDM recognition by the receptor Mincle induces blockage of signaling involved in phagosomal formation and maturation, preventing normal acidification cascade.
Paper 03 — Echeverría-Valencia 2023
PI3P / EEA1 Depletion
By hydrolyzing PI3P (via SapM) and inhibiting PI3K hVPS34 (via ManLAM/PIM), Mtb prevents recruitment of EEA1 and HOPS complex, blocking the entire endosomal sorting pathway needed for lysosome delivery to the phagosome.
Paper 01 — Rankine-Wilson 2021 Paper 03 — Echeverría-Valencia 2023 Paper 07 — Chandra 2022
C

Manipulating Host Signaling via Secreted Factors

13 items ▼
Rv3722c — TRAF3 Interaction
Rv3722c interacts with TRAF3 (TNF receptor-associated factor 3) in host macrophages, suppressing MAPK and NF-κB signaling pathways. This inhibits pro-inflammatory cytokine production (TNF-α, IL-6) and promotes intracellular survival.
Paper 04 — Lei 2021
PknG — TRAF2/TAK1 Ubiquitination
PknG ubiquitinates TRAF2 and promotes p62-dependent selective autophagic degradation of TAK1, suppressing the innate immune NF-κB and MAPK signaling cascades.
Paper 02 — Bo 2023
PPE38 — MKRN1-Mediated NF-κB Suppression
PPE38 suppresses NF-κB activation through interaction with the E3 ubiquitin ligase MKRN1, dampening pro-inflammatory signaling in infected macrophages.
Paper 02 — Bo 2023
WhiB3 — Redox Homeostasis
WhiB3 is a redox sensor that maintains intracellular redox equilibrium during macrophage infection. It integrates signals from host-generated oxidative/nitrosative stress and reprograms mycobacterial lipid anabolism, linking virulence to metabolic adaptation.
Paper 02 — Bo 2023
KatG (Catalase-Peroxidase) & SodC (Superoxide Dismutase)
KatG detoxifies H2O2 produced by the oxidative burst. Cu,Zn superoxide dismutase SodC neutralizes superoxide radicals at the phagosomal membrane. AphC (alkyl hydroperoxide reductase) provides additional ROS resistance.
Paper 01 — Rankine-Wilson 2021 Paper 03 — Echeverría-Valencia 2023 Paper 07 — Chandra 2022
SigH / Mycothiol — ROS/RNS Stress Response
The sigma factor SigH is produced during ROS and RNS stress and regulates oxidative/heat stress responses. Mycothiol acts as a major antioxidant buffer, keeping the bacterial cytoplasm reduced under macrophage oxidative assault.
Paper 03 — Echeverría-Valencia 2023
NuoG — NOX2 / Apoptosis Inhibition
NuoG (NADH dehydrogenase subunit) neutralizes ROS produced by NOX2 and inhibits host cell apoptosis, allowing the bacterium to persist in a viable host cell rather than being released for uptake by fresh phagocytes.
Paper 01 — Rankine-Wilson 2021 Paper 07 — Chandra 2022
HRH1 / p38MAPK-NOX2 Axis
Mtb utilizes host histamine receptor H1 (HRH1) to modulate ROS production and phagosome maturation via the p38MAPK-NOX2 signaling axis, controlling the oxidative environment of the phagosome.
Paper 03 — Echeverría-Valencia 2023
Epigenetic Reprogramming — Histone Modifications
Rv1988 methylates histone H3R42, Rv3763 methylates H4R55, and Rv2966c methylates non-CpG DNA at cytosine C5. These secreted methyltransferases enter the host nucleus and directly modify chromatin to silence immune genes.
Paper 10 — Khadela 2022
ESAT-6 — MHC-II Suppression via Histone Modification
ESAT-6 inhibits MHC class II expression by inducing histone modifications at the CIITA promoter, reducing antigen presentation and T-cell activation.
Paper 10 — Khadela 2022
miRNA Modulation (miR-125a, miR-27b, miR-155)
Mtb infection upregulates miR-125a and miR-27b which suppress NF-κB signaling. miR-155 is induced to modulate inflammatory responses. These host microRNAs are co-opted to dampen pro-inflammatory cytokine production.
Paper 10 — Khadela 2022
DC-SIGN / IL-10 Signaling Manipulation
Mtb ManLAM recognized by DC-SIGN induces IL-10 and counteracts TLR-4 response. Interaction with DCs reduces IL-12, decreasing T cell activity. Mtb limits DC maturation and antigen presentation as immune evasion strategy; increased IL-10 expression correlates with increased bacterial replication in DCs.
Paper 03 — Echeverría-Valencia 2023 Paper 08 — Kim 2022
Nitric Oxide Dormancy Induction
Mtb exposed to NO has a bacteriostatic effect and induces the expression of dormancy-related genes, entering a metabolically quiescent state that resists killing by both immune cells and antibiotics.
Paper 03 — Echeverría-Valencia 2023
D

Occupying Alternative Lung Immune Cell Niches

7 items ▼
CD11clo MNC1 Monocyte-Derived Cells
During chronic infection, Mtb preferentially resides in CD11clo MNC1 cells that harbor 4–6× more live bacteria than alveolar macrophages. These cells are intrinsically deficient in lysosome biogenesis (V-ATPase, LAMP1, cathepsins), providing a permissive niche without requiring active bacterial manipulation.
Paper 05 — Zheng 2024
MNC1 — Lysosome-Poor Transcriptional Program
MNC1 cells express a transcriptional program deficient in ATP6V0D2 (V-ATPase subunit), LAMP1, CTSD, and CTSB. This is not induced by Mtb but is a constitutive property of these monocyte-derived cells, making them intrinsically permissive hosts.
Paper 05 — Zheng 2024
ESX-1–Dependent Monocyte Recruitment
Mtb uses the ESX-1 (Type VII) secretion system to actively recruit permissive monocytes to the site of infection. These newly recruited monocytes differentiate into MNC1 cells that become the primary intracellular niche during chronic infection.
Paper 05 — Zheng 2024 Paper 07 — Chandra 2022
Alveolar Macrophage → Diversification
AMs are the initial permissive niche in early infection. As disease progresses, Mtb diversifies into PMNs (neutrophils), dendritic cells, and recruited interstitial/inflammatory macrophages. Each cell type offers a different intracellular environment with varying permissiveness.
Paper 07 — Chandra 2022
Dendritic Cell Exploitation
Mtb limits DC maturation and antigen presentation capacity while replicating inside DCs. Increased Mtb numbers in DCs correlate with elevated IL-10 expression. DCs infected with Mtb also induce IFN-α/β that recruit NK cells and T cells, potentially expanding the infection niche via granuloma formation.
Paper 03 — Echeverría-Valencia 2023 Paper 08 — Kim 2022
Epigenetic Reprogramming of Myeloid Populations
Mtb epigenetically reprograms myeloid populations through trained immunity mechanisms, creating a heterogeneous population of host cells with varying antimicrobial capacity. Some reprogrammed cells become more permissive to bacterial persistence.
Paper 07 — Chandra 2022 Paper 10 — Khadela 2022
Neutrophil Niche (Double-Edged)
Neutrophils are recruited to the infection site and interact with Mtb. If absent immediately after infection, bacterial counts increase. However, Mtb can survive within neutrophils and use them as Trojan horses for dissemination; necrotic neutrophils release bacteria that can infect fresh macrophages.
Paper 03 — Echeverría-Valencia 2023 Paper 07 — Chandra 2022

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