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In this study, we explore the mechanisms of redox homeostasis in such niches and show that myeloid-like blood progenitor cells of the <jats:italic><jats:italic>Drosophila<\/jats:italic><\/jats:italic> larval lymph gland, that generate reactive oxygen species (ROS), moderate it developmentally by <jats:italic><jats:italic>de novo<\/jats:italic><\/jats:italic> synthesizing glutathione (GSH) to ensure redox balance. During lymph gland development, as the blood-progenitor cells oxidize pyruvate via the TCA cycle leading to the generation of ROS, GABA-shunt restricts pyruvate dehydrogenase (PDH) activity and consequently TCA cycle flux. This moderation enables a metabolic rerouting of TCA-derived oxaloacetate (OAA) to pyruvate via gluconeogenesis, which is necessary to sustain serine levels, the rate-limiting precursor for <jats:italic><jats:italic>de novo<\/jats:italic><\/jats:italic> GSH synthesis. Disruption of GABA metabolism causes metabolic imbalance, marked by excessive PDH activity and heightened TCA cycle flux. This results in reduced OAA availability, impaired gluconeogenic capacity, and insufficient serine\/GSH production, ultimately leading to ROS dysregulation. Overall, this study identifies a unique metabolic framework in blood progenitor cells, where the GABA shunt, by restraining PDH and TCA cycle activity, maintains ROS at developmental levels. By coupling TCA-derived metabolites to GSH production, this state enables the TCA cycle to support both ROS generation and ROS scavenging, ensuring the developmental roles of ROS while preserving progenitor homeostasis.<\/jats:p>","DOI":"10.1371\/journal.pgen.1011602","type":"journal-article","created":{"date-parts":[[2025,9,29]],"date-time":"2025-09-29T17:44:54Z","timestamp":1759167894000},"page":"e1011602","update-policy":"https:\/\/doi.org\/10.1371\/journal.pgen.corrections_policy","source":"Crossref","is-referenced-by-count":5,"title":["Metabolic coupling of ROS generation and antioxidant synthesis by the GABA shunt pathway in myeloid-like blood progenitor cells of Drosophila"],"prefix":"10.1371","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0899-8288","authenticated-orcid":true,"given":"Manisha","family":"Goyal","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sakshi","family":"Tiwari","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jagriti","family":"Arora","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bruce","family":"Cooper","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6709-190X","authenticated-orcid":true,"given":"Ramaswamy","family":"Subramanian","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3776-5536","authenticated-orcid":true,"given":"Tina","family":"Mukherjee","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"340","published-online":{"date-parts":[[2025,9,29]]},"reference":[{"issue":"22","key":"pgen.1011602.ref001","doi-asserted-by":"crossref","first-page":"4206","DOI":"10.1242\/dev.107086","article-title":"Stem cells and the impact of ROS signaling","volume":"141","author":"CL Bigarella","year":"2014","journal-title":"Development"},{"key":"pgen.1011602.ref002","doi-asserted-by":"crossref","DOI":"10.3389\/fcell.2021.714370","article-title":"Physiological signaling functions of reactive oxygen species in stem cells: from flies to man","volume":"9","author":"SA Sinenko","year":"2021","journal-title":"Front Cell Dev Biol"},{"key":"pgen.1011602.ref003","doi-asserted-by":"crossref","unstructured":"Zhou D, Shao L, Spitz DR. 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